4.7 Article

Structural Investigations on the Compositional Anomalies in Lanthanum Zirconate System Synthesized by Coprecipitation Method

Journal

JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 97, Issue 3, Pages 718-724

Publisher

WILEY
DOI: 10.1111/jace.12741

Keywords

-

Ask authors/readers for more resources

The study set out to investigate the compositional inconsistency in lanthanum zirconate system revealed the presence of nonstoichiometry in lanthanum zirconate powders when synthesized by coprecipitation route. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) investigations confirmed the depletion of La3+ ions in the system. Analysis using Vegard's law showed the La/Zr mole ratio in the sample to be around 0.45. An extra step of ultrasonication, introduced during the washing stage followed by the coprecipitation reaction, ensured the formation of stoichiometric La2Zr2O7. Noteworthy is also the difference between crystal sizes in the samples prepared by with and without ultrasonication step. This difference has been explained in light of the formation of individual nuclei and their scope of growth within the precipitate core. The differential scanning calorimetry (DSC) analyses revealed that optimum pH for the synthesis of La2Zr2O7 is about 11. The ultrasonication step was pivotal in assuring consistency in mixing and composition for the lanthanum zirconate powders.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

Article Materials Science, Ceramics

Structure-property relations for a phase-pure, nanograined tetragonal zirconia ceramic stabilized with minimum CaO doping

Aditya Arun, Lakshaman Kumar, Anirban Chowdhury

Summary: This study introduced a high-density CaO-stabilized ZrO2 ceramic with exceptional hardness and stability after minimal doping and conventional sintering, suggesting potential for future applications.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2021)

Article Nanoscience & Nanotechnology

Can a shape factor in bulk ceramics mitigate unwanted phase transformations?

Lakshaman Kumar, Aditya Arun, Anirban Chowdhury

Summary: This study introduces the concept of 'shape strain' to show its beneficial effect in controlling/avoiding undesired phase transitions in ceramics. The results indicate that CaO-doped zirconia ceramics exhibit the most prominent effect, which is also influenced by the dopant grain boundary mobility.

SCRIPTA MATERIALIA (2021)

Article Materials Science, Multidisciplinary

Investigation of selected HVOF and plasma sprayed coatings for sustained performance in molten zinc

Anushri Nag, Manish Kumar Bhadu, Pavan Kumar Bijalwan, Abhishek Subhash Pathak

Summary: This study examines the prolonged performance of coatings like Cr3C2-NiCr, Al2O3, Al2O3-TiO2 and WC-12Co in molten zinc for 30 days, and finds that oxide coatings, particularly Al2O3, exhibit better performance compared to carbide coatings. Post-testing evaluation includes corrosion products and phase analysis, elemental mapping, surface morphology, porosity assessment, and weight change data.

CORROSION SCIENCE (2021)

Article Materials Science, Multidisciplinary

Novel hybrid sacrificial anodes based on high phosphorus pig iron and Zn

Nisheeth Kr. Prasad, A. S. Pathak, S. Kundu, K. Mondal

Summary: A series of novel hybrid anodes composed of high phosphorus pig iron and zinc show improved anodic performance in seawater, exhibiting effectiveness as sacrificial anodes with a more negative potential compared to mild steel. These hybrid anodes demonstrate comparable capacity and efficiency to commercial zinc anodes, attributed to the localized segregation of zinc and large cathode-to-anode area-ratio in their microstructure.

CORROSION SCIENCE (2021)

Article Materials Science, Multidisciplinary

On the novel approach of sacrificial cathodic protection of mild steel in simulated concrete pore solution and concrete mortar by high phosphorus pig iron anodes

Nisheeth Kr Prasad, A. S. Pathak, S. Kundu, Pankaj Panchal, K. Mondal

Summary: The study investigated the effectiveness of high phosphorus pig iron as a sacrificial anode for cathodic protection of mild steel in concrete. Results showed that pig iron samples exhibited more active potential compared to mild steel in simulated concrete pore solution, with lower polarization resistance as phosphorus content increased.

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2021)

Article Chemistry, Physical

CaO-doped tetragonal ZrO2 nanoparticles as an effective adsorbent for the removal of organic dye waste

Ritesh Singh, Sravan Bokka, Annu Kumar Lakshya, Anirban Chowdhury

Summary: This study demonstrates the potential of CaO-doped ZrO2 nanoparticles as a dye adsorbent. Unlike previous research, this study shows that the doped-ZrO2 system alone can achieve maximum adsorption capacity for Congo red, with high surface area and rapid dye removal.

APPLIED SURFACE SCIENCE (2022)

Article Nanoscience & Nanotechnology

Impact of different metallic forms of nickel on hydrogen evolution reaction

Abhishek Lahiri, Annu Kumar Lakshya, Shaoliang Guan, Lorna Anguilano, Anirban Chowdhury

Summary: This study demonstrates the influence of strain in different forms of nickel on hydrogen evolution reaction in alkaline solution and NaCl aqueous solution. Tensile strain in nickel foil reduces overpotential and improves reaction kinetics in alkaline solution, but the effect is less pronounced in NaCl solution.

SCRIPTA MATERIALIA (2022)

Article Materials Science, Multidisciplinary

Influence of a 'shape/consolidation factor' in unary, undoped oxide ceramics: Experimental evidence and associated benefits

Lakshaman Kumar, Faiz Ali, Sravan Bokka, Anirban Chowdhury

Summary: This work demonstrates the versatility of the 'shape/consolidation factor' effect in materials such as TiO2 and BaTiO3. Through suitable characterization techniques, the phenomenon has been studied and the beneficial role of the shape factor in defect control has been discovered.

MATERIALIA (2022)

Review Physics, Condensed Matter

Characterizing Curie and Neel Point Phase Transitions via Thermal Techniques

Jejitti Aravind Reddy, Annu Kumar Lakshya, Rishav Raj, Lakshaman Kumar, Anirban Chowdhury

Summary: Different magnetic materials have different transition temperatures, which are crucial for applications. Thermal methods, such as DSC, are commonly used for measuring Curie and Neel transitions. However, there is still confusion regarding the efficacy and analysis of these measurements.

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS (2023)

Article Thermodynamics

Texture-irrelevant thermal conductivity and expansion properties of La2Ce2O7 ceramics

Annu Kumar Lakshya, Himirkanti Sarkar, Faiz Ali, Anirban Chowdhury

Summary: In this study, the effect of crystal orientation on the thermal conductivity and thermal expansion coefficient of fluorite structured ceramic La2Ce2O7 was investigated. The results showed that crystal orientation had no significant influence on these properties, revealing a fundamental difference between electron conduction and thermal conduction via phonons.

THERMOCHIMICA ACTA (2023)

Article Chemistry, Multidisciplinary

Delving into the Discrepancy of Phase Developments between Powder and Shaped Pellets of BaCO3

Lakshaman Kumar, Himirkanti Sarkar, Sanyam Nitin Totade, Appa Rao Chintha, Anirban Chowdhury

Summary: This study investigates the instability of BaCO3 in pelletized form during heat treatment near its phase transformation temperature. The results show that BaCO3 pellets exhibit either a strong preferential c-axis orientation or strange variations in the intensity ratios of the peaks. The analysis suggests that the ease/difficulty of energy release during the phase transformation is related to the compressibility of the Ba-O atomic arrangement along the c-axis. The findings highlight the importance of considering the dependence of phase changes on shaping/consolidation for future scientific understanding.

CRYSTAL GROWTH & DESIGN (2023)

Article Materials Science, Ceramics

Adsorption prospects of ultrafine, cubic 8 mol.% Y2O3-stabilized ZrO2 nanoparticles

Pranav Ameta, Sravan Bokka, Annu Kumar Lakshya, Anirban Chowdhury

Summary: In this study, we demonstrate the remarkable efficacy of yttria-stabilized zirconia nano-adsorbents for toxic azo-dye removal. The adsorption capacity achieved was 550mg/g, which was attributed to factors such as nano-sized particles, phase-pure cubicity, and increased surface area, leading to the generation of oxygen vacancies on the synthesized doped-zirconia surfaces.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Multidisciplinary

Reviewing the cases of Nanoscale Heterogeneity in Ceramics: Boon or Bane?

Kundan Kumar, Anirban Chowdhury

Summary: The review article presents numerous case studies on factors influencing nanoscale heterogeneities in ceramics, emphasizing the role of raw materials, synthesis, and processing factors. It also discusses the connections between these heterogeneities and selected properties, as well as how to identify, understand, and use heterogeneities in nano-ceramics.

MATERIALIA (2021)

Article Chemistry, Physical

Role of electronically coupled in situ grown silver sulfides (Ag2S) nanoparticles with TiO2 for the efficient photoelectrochemical H2 evolution

Satya Veer Singh, Urwashi Gupta, Bratindranath Mukherjee, Bhola N. Pal

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2020)

Article Chemistry, Physical

Direct Evidence of an Efficient Plasmon-Induced Hot-Electron Transfer at an in Situ Grown Ag/TiO2 Interface for Highly Enhanced Solar H2 Generation

Satya Veer Singh, M. Praveen Kumar, Sengeni Anantharaj, Bratindranath Mukherjee, Subrata Kundu, Bhola N. Pal

ACS APPLIED ENERGY MATERIALS (2020)

Article Materials Science, Ceramics

Microwave dielectric characterization and densification mechanism analysis of CaO-B2O3-SiO2 glass-ceramic/Al2O3 composites for LTCC applications

Zilong Xiong, Wenzhuo Xue, Mujun Li, Feihu Tan, Yupeng Chen, Hongyu Yu

Summary: In this study, CBS glass/Al2O3 composites were developed for LTCC applications based on a CaO-B2O3-SiO2 (CBS) glass system with a high boron content. The study revealed that the softening of glass and interfacial reaction between the glass and Al2O3 were the two most important factors affecting LTCC's densification process. Real-time shrinkage rate of LTCC during sintering was successfully simulated, and it was proven that the formation of the CaAl2(BO3)O phase played a significant role in reducing glass viscosity and promoting dense structure formation. The resulting LTCC composite exhibited excellent performance for high-frequency applications.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

Response of nonstoichiometric pyrochlore composition Nd1.8Zr2.2O7.1 to electronic excitations

Saurabh Kumar Sharma, Vinita Grover, Rakesh Shukla, Abid Hussain, Ambuj Mishra, Pawan Kumar Kulriya

Summary: In this study, the disordering caused by swift heavy ion irradiation in two different compositions of pyrochlore structures was investigated. X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy were used to analyze the samples before and after irradiation. It was found that both compositions underwent amorphization due to irradiation, with a slower rate observed in Nd1.8Zr2.2O7.1. The irradiation-induced modified track region in Nd1.8Zr2.2O7.1 consisted of defect-rich pyrochlore structure, anion-deficient fluorite structure, and amorphous domains.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

Influence of ion-induced lattice stress and phase transition on the irradiation resistance of high-entropy ceramics

Jiabei He, Mengshan Song, Ming Yang, Miaomiao Zhu

Summary: This study investigates the influence of ion irradiation on high-entropy ceramics and finds that irradiation-induced lattice rearrangement can improve the radiation resistance of these ceramics.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

Multifunctional tantalum disilicide ceramics sintered at high temperature and high pressure

Yajie Yu, Shi He, Zhengang Zhang, Haihua Chen, Peipeng Jin, Binnian Zhong, Linhui Zhang, Liping Wang, Cheng Lu

Summary: Silicide ceramics, including tantalum disilicide (TaSi2), are known for their exceptional physical properties but are limited in practical applications due to their inherent brittleness at room temperature. In this study, we successfully improved the mechanical properties of TaSi2 ceramics and increased their electrical conductivity by modifying the preparation methods and sintering conditions. These findings provide valuable insights for future applications of TaSi2 and the design of advanced ceramic materials.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

Exploring the Ln-O bonding nature and charge characteristics in monazite in relation to microwave dielectric properties

Jian Li, Jia Liu, Yongcui Zhang, Wei Sun, Yang Wang, Haitao Wu, Ling Li, Chuanbing Cheng, Yingying Wang, Ke Tan, Futian Liu

Summary: Microstructure design plays a crucial role in regulating the microwave dielectric properties of materials, however, the understanding of frequency temperature stability and related micromechanism remains limited. In this study, a combination of first-principles calculations and experimental observation was used to investigate the correlation among sintering behavior, crystal structure, bonding nature, and microwave dielectric properties of LnPO(4) (Ln = Eu, Pr) ceramics. The research findings systematically clarify the optimized effect and micromechanism of lanthanides on the dielectric properties of monazite ceramics, providing insights into the design and enhancement of microwave dielectric materials.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

Effect of fiber orientation on tribological properties of fiber-reinforced C/C-SiC composites mated with ceramic ball

Wenqian Pan, Xizhen Xia, Wei Zhou, Yang Li

Summary: The study investigates the frictional and wear behaviors of carbon fiber-reinforced SiC ceramic matrix composites with different fiber orientations mating with ceramic balls. The results show that fiber orientation significantly affects the friction and wear properties of the composites. Pads with randomly arranged fibers demonstrate better friction stability and lower wear volume, potentially suitable for bearing material applications. The research also explores the factors influencing the formation of continuous tribo-film and identifies abrasive wear and oxidation wear as the dominant wear mechanisms for the friction pairs.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

Synthesis and sintering of MAX phases in the Zr-Al-C system

Sergey Nikolaevich Perevislov, Ilya Evgenievich Arlashkin, Valentina Leonidovna Stolyarova

Summary: This paper describes the synthesis and sintering of MAX phases in the Zr-Al-C system. Different mixtures of initial Zr/Al/C and Zr/Al/ZrC powders were used to synthesize Zr2AlC and Zr3AlC2 MAX phases. The highest content of Zr3AlC2 MAX phase was obtained using a component ratio of 1:1.5:2-51.1 vol.% of Zr/Al/ZrC powders.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

B-site internal-strain regulation engineering of tungsten bronze structural dielectric ceramics

Weijia Luo, Xubin Wang, Baiheng Bai, Jianli Qiao, Xingcong Chen, Yongzheng Wen, Jingbo Sun, Lingxia Li, Ji Zhou

Summary: This study successfully establishes the relationship between internal strain and dielectric loss by synthesizing and designing specific structure of tungsten bronze ceramics, and concludes that controlling internal strain can effectively reduce dielectric loss. This research is of great significance for the development of future all-ceramic non-Hermitian devices.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

Ultrafast high-temperature sintering of ZrB2

Santanu Mondal, Juan Diego Shiraishi Lombard, Sreenivasulu Gollapudi, Carolina Tallon, Jie-Fang Li, Dwight Viehland

Summary: Ultrafast high-temperature sintering (UHS) is an effective method for rapidly densifying ZrB2 powders. The final grain size increases with longer sintering duration. X-ray diffraction and energy-dispersive spectroscopy show crystalline phase and compositional uniformity in ZrB2 after UHS.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

Effects of doping on electronic structure and ion diffusion of Li2FeSiO4

JiaNan Wang, ZhiQiang Li, YongZheng Zhu, Yao Liang, Yan Cui, HuaLong Tao, Bo Song, Alexander Nikiforov, ZhiHua Zhang

Summary: First-principles calculations were performed to investigate the crystal structure, electronic structure, and ion diffusion of sulfur-doped Li2FeSiO4. The results showed that sulfur doping can improve the electronic conductivity and reduce the energy barrier for ion diffusion.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

Early structural build-up behavior, setting mechanism, and nanostructure of alkali-activated GGBFS mixtures

Xiaodi Dai, Serdar Aydin, Mert Yuecel Yardimci, Gunter Reekmans, Peter Adriaensens, Geert De Schutter

Summary: This study investigates the rheological behavior, solidification process, and nanostructure changes of sodium hydroxide-activated slag (NH-AAS) and sodium silicate-activated slag (SS-AAS) pastes over time. The results show that NH-AAS and SS-AAS release similar heat and reach a similar reaction degree at their initial setting times, but have different gel structures.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

Effect of resting time on rheological properties of glass bead suspensions: Depletion and bridging force among particles

Yanliang Ji, Simon Becker, Zichen Lu, Alexander Mezhov, Regine von Klitzing, Schmidt Wolfram, Dietmar Stephan

Summary: This study reveals the significant influence of resting time on the rheological properties of cement suspensions, which is closely related to non-absorbed polycarboxylate superplasticizers (PCEs) size variation. Adsorbed PCE during resting tends to bridge particles instead of dispersing them, leading to an increased yield stress.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

Multiscale understanding the effect of K/Na ratio on electrical properties of high-performance KNN-based ceramics

Yifeng Huang, Xin Wang, Yinchang Ma, Xiang Lv, Jiagang Wu

Summary: This study investigates the effect of K/Na ratio on the phase structure, ferroelectric domains, and piezoelectric properties of potassium sodium niobate (KNN)-based ceramics. It reveals that high Na+ content leads to large ferroelectric domains, while high K+ content results in local polarity heterogeneity and distinct dielectric relaxational behavior. The balanced local polarity and stress heterogeneities contribute to improved piezoelectricity.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

Hierarchical porous MgAl2O4 ceramic in situ structured by hollow particles: Low-shrinkage and high-strength

Zun Xia, Yedong Rong, Hao Li, Ye Dong, Hongbo Yu, Jie Xu, Xiuhui Wang, Jinlong Yang

Summary: This study presents the synthesis of hollow MgAl2O4 particles in situ within porous ceramics, resulting in volume expansion and the formation of a hierarchical pore structure, leading to a significant improvement in compressive strength.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)

Article Materials Science, Ceramics

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0-1000 kGy

Honglong Wang, Zhiguo Sun, Faming Xia, Chenguang Yang, Xiaoguang Wang, Jintang Li, Linxu Jiang

Summary: In this study, the micro-geometry morphology variation and microstructural transformation mechanism of muscovite crystals under electron beam irradiation were explored. The results revealed the instability of the muscovite lattice under irradiation, as well as the expansion and shrinkage of the lattice with increasing dose. The study also identified changes in chemical structure and other mechanisms involved. These findings are significant for the design of radiation-resistant silicate materials and the manufacturing of electronic components used in the aerospace industry.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024)