Article
Chemistry, Physical
Ritesh Verma, Ankush Chauhan, Khalid Mujasam Batoo, Muhammad Hadi, Emad H. Raslan, Rajesh Kumar, Muhammad Farzik Ijaz, Abdulaziz K. Assaifan
Summary: The synthesis of vanadium-doped BCZT ceramic oxides was reported in this paper, confirming the existence of a solubility limit of V in BCZT ceramics. Analysis revealed the influence of crystal structure and formation of oxygen vacancies on the luminescence and electrical properties of the material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Seema Thakur, Vanita Thakur, Anumeet Kaur, Lakhwant Singh
Summary: The structural and optical properties of bismuth barium titanate glass-ceramics were studied, revealing that an increase in BaTiO3 content led to enhanced network compactness and higher optical band gap energy. The electronic polarizability values indicated that the glass-ceramic samples exhibited covalent character.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Optics
Mithun Bhowmick, Jacob Fryman, Xuan Zhou, Chari Ramkumar
Summary: Laser-driven hypervelocity impact experiments were conducted to investigate the long-term effects of pressure on the crystal structure of undoped GaSb. X-ray diffraction and confocal micro-Raman spectra were used to analyze unshocked and shock-compressed samples, with pressures ranging from 8 to 23 GPa. The results showed that GaSb remained crystalline at 8 GPa but exhibited localized site disordering, transitioned to an amorphous state at 13 GPa, and maintained that phase until 23 GPa.
Article
Chemistry, Physical
K. S. Almugren, S. F. Abdul Sani, Irzwan Affendy Sulong, S. N. Mat Nawi, A. S. Siti Shafiqah, D. A. Bradley
Summary: This study investigates the use of black carbon charcoal as passive radiation dosimetry, exploring Raman spectroscopy and photoluminescence analysis in graphite charcoal, as well as characterizing the crystal structure using X-ray diffractometry. The findings provide a low-cost yet highly effective system for studying radiation-induced changes in carbon and have potential applications in radiotherapy.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Materials Science, Ceramics
Guilherme M. Martins, Cristiano Fantini, Roberto L. Moreira, Anderson Dias
Summary: In this study, Gd2Ge2O7 polymorphs were obtained by solid-state reactions and their structural and vibrational features were investigated. The electronic transitions of Gd3+ 4f-4f were examined by diffuse reflectance spectroscopy and bandgap values were determined using the Kubelka-Munk function. The results showed that polymorphism in Gd2Ge2O7 ceramics can be utilized to tailor materials with specific optical properties.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Ritesh Verma, Ankush Chauhan, Khalid Mujasam Batoo, Rajesh Kumar, Muhammad Hadi, Emad H. Raslan
Summary: Sr2+ doped Ba0.9-xCa0.1SrxTi0.8Zr0.2O3 nano-ceramics were synthesized by the conventional solid-state reaction method. XRD analysis confirmed the formation of a single-phase orthorhombic ABO3 structure, with increased crystallite size and decreased lattice parameter, dislocation density, and apparent density with doping. Porosity increased with doping, and various spectroscopy techniques revealed structural and compositional changes in the materials.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
H. Slimi, A. Oueslati, A. Aydi
Summary: Lead-free ceramics BCNTSNO3 were synthesized through a traditional method, exhibiting good dielectric and optical properties. XRD and Raman analysis showed ferroelectric relaxor or classical ferroelectric behaviors, making BCNTSNO3 suitable for industrial applications. UV-Vis spectroscopy revealed the optical band gap energy for BCNTSNO3 with different compositions.
Article
Engineering, Electrical & Electronic
Yeqing Guan, Jinxian Zhang, Fenglin Wang, Wei Li, Haijun Mao, Zhuofeng Liu, Weijun Zhang, Xingyu Chen
Summary: The Ca0.245Li0.325Nd0.395Ti1-xSnxO3 (x = 0-0.12) ceramics were prepared and the effects of Sn4+ substitution for Ti4+ on their properties were studied. X-ray diffraction showed a single orthorhombic perovskite phase for x = 0-0.09, but a secondary phase SnO2 appeared with x > 0.09. Proper Sn4+ substitution promoted grain growth and homogenization. Raman spectroscopy revealed the correlation between vibration modes and microwave dielectric properties. Ceramics with x = 0.09 sintered at 1350℃ for 4 h exhibited excellent microwave dielectric properties, with epsilon(r) = 98, Q x f(0) = 3320 GHz, and tau(f) = 2.6 ppm/℃.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
N. P. Samantray, R. N. P. Choudhary
Summary: This study reported the structural and electrical properties of Ca/Zr modified polycrystalline BiFeO3 samples prepared by solid-state reaction method, revealing the formation of single phase perovskite in rhombohedral phase and the ferroelectricity in the materials. Analysis of X-ray diffraction data and scanning electron microscope images provided insights into the micro-structure, while dielectric, impedance and conductivity studies offered information on the dielectric properties and conductivity of the materials. Additionally, the contribution of grains and grain boundaries towards the total resistance and capacitance was determined from Nyquist plots. The J-E characteristics demonstrated Ohmic behavior with a slope close to 1.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Jiyang Li, Haiming Hua, Xiangbang Kong, Huiya Yang, Pengpeng Dai, Jing Zeng, Jinbao Zhao
Summary: This study investigates the thermal decomposition process of high-nickel NCM materials using in-situ heating Raman spectroscopy. It confirms that the near-surface structure of fully charged high-nickel NCM materials has lower thermal stability than previously recognized. Additionally, the study reveals that the electrolyte components and surface oxidation state of high-nickel NCM materials significantly modulate the near-surface structural thermal stability.
ENERGY STORAGE MATERIALS
(2022)
Article
Materials Science, Ceramics
Y. Tamraoui, F. El Bachraoui, F. Mirinioui, S. Louihi, J. Alami, I. Saadoune, A. El Hachmi, P. Lazor, B. Manoun
Summary: A series of double-perovskite oxides Sr2Sr1-xCaxTeO6 (0 <= x <= 1) were prepared to investigate the effect of composition on phase changes and optical properties, revealing two distinct phase transitions with increasing calcium content. Optical absorption and band gap measurements showed significant changes corresponding to the phase transitions, providing valuable insights into the role of calcium in enhancing electrical properties.
JOURNAL OF ELECTROCERAMICS
(2021)
Article
Materials Science, Ceramics
Zexing Wang, Yunfeng Guo, Jiamao Li
Summary: In this paper, a series of Li2Zn[Ti1-x(Co1/3Nb2/3)x]3O8 ceramics were prepared via the conventional solid-state method. The influences of (Co1/3Nb2/3)4+ complex ions on the phase composition, spectral characteristics, microstructure, and microwave dielectric properties of Li2Zn[Ti1-x(Co1/3Nb2/3)x]3O8 ceramics were systematically studied. The study found that the presence of (Co1/3Nb2/3)4+ content affected the structure, performance, and microwave dielectric properties of Li2Zn[Ti1-x(Co1/3Nb2/3)x]3O8 ceramics.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Bibek Kumar Sonu, Ela Sinha
Summary: Barium cerate perovskite ceramics substituted with zirconium were prepared and characterized in terms of thermal stability and electrical conductivity. With increasing Zr-substitution, the thermal stability of the ceramics improved gradually. Complex impedance spectroscopy studies demonstrated the influence of bulk and grain boundary on the total resistance. Additionally, the Arrhenius dependence of the total conductivity showed a decrease with an increase in Zr concentration, especially in wet nitrogen atmosphere.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Pengcheng Zhang, Xiaoqing Chen, Gongtian Chen, Bin Yang, Canbing Li, Hao Li
Summary: This study investigates the relationship between structure and microwave dielectric properties of Ca3MgSi2O8 ceramic using various methods, and identifies the crucial role of Ca-O and Si-O bonds in the dielectric performance.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Ashok Kumar, Anurag Sharma, Madhav Sharma, Vinod Singh, Anita Dhaka, Rajendra S. Dhaka
Summary: We investigated the structural, vibrational, morphological, and electronic properties of Nb substituted orthova-nadate LaV1-xNbxO4 samples prepared by the solid-state reaction method. The x-ray diffraction (XRD) analysis revealed the presence of three crystal structures with an increase in Nb5+ concentration. Raman spectroscopy and x-ray photoelectron spectroscopy (XPS) were employed to study the vibrational and electronic properties of all the samples, respectively. Our study provided insights into the evolution of the structural, morphological, and chemical features with Nb substitution in LaV1-xNbxO4 samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Thomas Schulz, Vignaswaran Veerapandiyan, Marco Deluca, Joerg Toepfer
Summary: Bulk ceramic samples of the perovskite series were prepared using the conventional solid-state route, with careful characterization of Bi2O3 raw materials being essential. X-ray diffraction analysis revealed the formation of perovskite main phase, and samples with higher CaZrO3 fraction showed a flattening of permittivity-temperature curves along with low dielectric losses.Samples with x = 0.2 exhibited a temperature stable permittivity of epsilon(r) approximate to 600 with small dielectric losses, qualifying them as suitable high temperature capacitor dielectric materials.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Materials Science, Multidisciplinary
Monica Materano, Peter Reinig, Alfred Kersch, Maxim Popov, Marco Deluca, Thomas Mikolajick, Ulrich Boettger, Uwe Schroeder
Summary: This article discusses the importance of inducing and detecting the polar orthorhombic phase in HfO2- and ZrO2-based thin films. Traditional structural characterization techniques are not accurate enough, hence the use of Raman spectroscopy to differentiate different phases. By comparing experimental and computational Raman spectra, the phase assignment can be determined, allowing for the prediction of ferroelectricity in the layers.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Article
Chemistry, Inorganic & Nuclear
Jelena Bobic, Nikola Ilic, Vignaswaran Veerapandiyan, Marco Deluca, Adis Dzunuzovic, Jelena Vukmirovic, Kaijie Ning, Klaus Reichmann, Steven Tidrow, Mirjana Vijatovic Petrovic
Summary: The ferroelectric and magnetic properties of four-layered Aurivillius Bi5Ti3FeO15 (BFT) compounds were investigated by partially substituting Bi3+ with Y3+ and Fe3+ with Co2+. Y3+ replaces Bi ions in the pseudoperovskite layers and Co2+ replaces Fe ions in the octahedral sites. The chemically modified samples show a decrease in grain size, and Co substituted BFT ceramics exhibit ferromagnetic behavior.
SOLID STATE SCIENCES
(2022)
Article
Nanoscience & Nanotechnology
Vignaswaran Veerapandiyan, Maxim N. Popov, Florian Mayer, Juergen Spitaler, Sarunas Svirskas, Vidmantas Kalendra, Jonas Lins, Giovanna Canu, Maria Teresa Buscaglia, Marek Pasciak, Juras Banys, Pedro B. Groszewicz, Vincenzo Buscaglia, Jiri Hlinka, Marco Deluca
Summary: This study presents an effective charge-mediated mechanism for relaxor behavior appearing at low substituent contents in heterovalent modified barium titanate ceramics, contributing to a deeper understanding of relaxor behavior in chemically modified ferroelectric materials.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Michael Tkadletz, Nina Schalk, Alexandra Lechner, Lukas Hatzenbichler, David Holec, Christina Hofer, Marco Deluca, Bernhard Sartory, Andrey Lyapin, Jaakko Julin, Christoph Czettl
Summary: The study investigated the effect of B content on the microstructure, phase composition, and mechanical properties of CVD Ti(B,N) coatings. Experimental results showed that increasing B content led to changes in microstructure, with hardness and toughness increasing up to a certain B content before showing a significant drop.
Article
Nanoscience & Nanotechnology
Dursun Ekren, Jianyun Cao, Feridoon Azough, Demie Kepaptsoglou, Quentin Ramasse, Ian A. Kinloch, Robert Freer
Summary: This study investigates the effects of processing parameters and graphene addition on the thermoelectric performance of La-doped SrTiO3. The results show that adding mildly oxidized electrochemical graphene oxide (EGO) and muffling the green body with an oxygen-scavenging carbon powder bed during sintering significantly improve the electrical conductivity and power factor of the material. Theoretical modeling and microstructure analysis reveal the mechanism of improved carrier mobility in the grain boundary phase due to graphene addition.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Correction
Nanoscience & Nanotechnology
Yibing Zhu, Feridoon Azough, Xiaodong Liu, Xiangli Zhong, Minghao Zhao, Kalliope Margaronis, Sohini Kar-Narayan, Ian Kinloch, David J. Lewis, Robert Freer
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Yu Liu, Paul D. McNaughter, Feridoon Azough, Xiaodong Liu, Jonathan M. Skelton, Andrey Kretinin, Robert Freer, David J. Lewis
Summary: Through aerosol-assisted chemical vapor deposition, polycrystalline orthorhombic SnS thin films were prepared using a single source precursor. The deposition temperature has a dominant effect on charge transport. The maximum power factor and the relatively low thermal conductivity of the SnS films were obtained at certain deposition temperature, making them promising candidates for thermoelectric applications. The study also provided an improved understanding of the materials performance through investigating the electronic structure and electrical transport properties.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Yu Liu, Andrey V. Kretinin, Xiaodong Liu, Weichen Xiao, David J. Lewis, Robert Freer
Summary: Cu12Sb4S13 thin films were deposited on various substrates via aerosol-assisted chemical vapor deposition (AACVD), and the addition of a Sb2O3 buffer layer improved the quality and electrical transport properties of the deposited thin film. The films grown on different substrates showed different microstructures and electrical transport properties, with the film deposited on a SiO2-coated Si wafer exhibiting the best performance.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Florian Mayer, Marco Deluca, Maxim N. Popov
Summary: By conducting large-scale molecular dynamics simulations, we discovered hidden phases in Zr- and Nb-doped barium titanate (BaTiO3). We investigated the formation and stability of these phases under different stimuli and temperatures (20 and 200 K), revealing the compositional dependence of their properties. Our findings demonstrate the potential of lead-free relaxor ferroelectrics for near-room-temperature neuromorphic computing.
Article
Nanoscience & Nanotechnology
Yibing Zhu, Feridoon Azough, Xiaodong Liu, Xiangli Zhong, Minghao Zhao, Kalliope Margaronis, Sohini Kar-Narayan, Ian Kinloch, David J. Lewis, Robert Freer
Summary: We present a novel method to enhance the thermoelectric performance of ceramics. By using ammonium tetrathiomolybdate as a precursor, the electrical conductivity of the ceramics is significantly increased without impacting the Seebeck coefficients. This method provides a simple way to achieve high charge mobility in polycrystalline titanate materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Sahil Tippireddy, Feridoon Azough, Animesh Bhui, Iuliia Mikulska, Robert Freer, Kanishka Biswas, Paz Vaqueiro, Anthony V. Powell
Summary: CuFeS2 is a promising n-type thermoelectric candidate for low-grade waste heat recovery. In this study, chromium-containing CuFeS2 materials were synthesized, resulting in the formation of a composite with Cr-rich precipitates embedded in the CuFeS2 matrix. By reducing a portion of Fe(3+) ions to Fe2+, the Cu:Fe ratio of the CuFeS2 phase was altered, indirectly affecting the electrical properties. Additionally, the presence of nano-sized precipitates and dislocations significantly reduced the lattice thermal conductivity, resulting in an enhanced thermoelectric figure-of-merit.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Florian Mayer, Maxim N. Popov, Petr Ondrejkovic, Jiri Hlinka, Juergen Spitaler, Marco Deluca
Summary: This study employs large-scale molecular dynamics simulations and an effective Hamiltonian approach to investigate the macroscopic properties of barium titanate solid solutions. Theoretical descriptions and density functional theory calculations are used to parametrize the models for homovalent and heterovalent substitutions. The effectiveness of the models is validated by comparing their predictions with experimental data, providing valuable insights.
Article
Materials Science, Multidisciplinary
Florian Mayer, Maxim N. Popov, Donald M. Evans, Stephan Krohns, Marco Deluca, Jurgen Spitaler
Summary: By calculating the anharmonic contributions to the potential energy surface, the quality of molecular dynamics simulations of barium titanate can be improved, leading to more accurate predictions of physical properties such as phase transition temperatures. This approach can also be applied to other perovskite structures.
Article
Materials Science, Ceramics
Jorge Sanz-Mateo, Marco Deluca, Bernhard Sartory, Federica Benes, Daniel Kiener
Summary: This study compares the conventional wedge polishing method and the FIB-based lift out preparation method for ceramic thin film sample preparation. The results show that both methods can produce samples with comparable quality, although the FIB method has limitations in selecting the visualized area. The findings of this study are important for researchers working on ferroelectric thin films, as it provides an effective and uncomplicated method for TEM sample preparation.
CERAMICS-SWITZERLAND
(2022)
