Article
Materials Science, Ceramics
Philippe Colomban, Anh-Tu Ngo, Howell G. M. Edwards, Linda C. Prinsloo, L. Valerie Esterhuizen
Summary: Shards of Blue-and-White Ming porcelain from shipwrecks of Portuguese ships found on the coasts of South Africa, as well as a shard from Mombasa (Kenya), were analyzed using optical microscopy, SEM-EDS, and Raman microspectroscopy. The study revealed differences in the composition of the porcelain body paste and types of glazes used, with blue decoration characteristic of materials rich in manganese.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Analytical
Mathilda L. Coutinho, Joao Pedro Veiga, Andreia Ruivo, Teresa P. Silva, Eduardo Salas-Colera, Silvia Bottura-Scardina, Augusta Lima, Elin Figueiredo, Marine Cotte, Maria Margarida R. Lima
Summary: Chinese blue-and-white porcelain is significant evidence of global trade routes and cultural exchange. Research has shown that the blue color of the porcelain is determined by the speciation of cobalt and iron, which can also be affected by the firing atmosphere conditions.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2022)
Article
Chemistry, Multidisciplinary
Ibrahim Hakki Karakas, Zeynep Karcioglu Karakas, Mehmet Ertugrul
Summary: The study investigates the use of cobalt aluminate nanoparticles synthesized by microwave-assisted combustion as photocatalysts for dye removal from synthetic wastewater. These nanoparticles exhibit superior photocatalytic activity compared to those produced by conventional combustion technique, successfully removing all dyestuff content in a solution containing 50 mg/L dye under UV irradiation for approximately 60 minutes.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Materials Science, Ceramics
Sila Yaemphutchong, Worawat Wattanathana, Kantapat Chansaenpak, Suparat Singkammo, Pongsakorn Kanjanaboos, Patompong Siri-apai, Supakorn Janejobsakonkit, Pornnapa Pipattanaporn, Natapol Suetrong, Suttipong Wannapaiboon, Yuranan Hanlumyuang
Summary: This study reports on the coloration mechanism of cobalt aluminate spinel materials derived from thermal decomposition. The results suggest that the coloration can be modified by controlling Co2+/Co3+ contents and their site occupancies through adjusting calcination temperatures and selecting suitable counter ions.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Ling Tan, Qikun Wang, Zhipeng Cheng, Zhiwei Hu, Kun Liu, Yongqing Wang, Qibing Chang
Summary: This paper successfully synthesized CuxCo1-xAl2O4 blue pigments, suitable for ceramic decoration and ceramic ink-jet printing technology. The intensity of blue hue of the pigments decreases with increase of the Cu/Co ratio, while it increases with increase of the calcination temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Environmental Sciences
Muyang Zhou, Kun Liu, Qian Peng, Kun Jiang, Xuekun Tang, Yingjie Zhang, Jiajie Xing
Summary: A novel composite catalyst prepared by fixing cobalt aluminate spinel on formed alumina carrier is reported, which efficiently activates peroxymonosulfate to degrade p-nitrophenol. The phase composition and preparation conditions are explored, and the introduction of additional aluminum ions is found to affect the activity and stability of the catalyst. The selected catalyst exhibits excellent catalytic degradation performance at different temperatures and pH ranges.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Chemistry, Inorganic & Nuclear
Dana Gingasu, Ovidiu Oprea, Gabriela Marinescu, Jose Maria Calderon Moreno, Daniela C. Culita, Silviu Preda, Vasile-Adrian Surdu
Summary: In this study, a series of single and mixed Ni-Co aluminates were synthesized using the precursor method. The effects of nickel substitution on the structure, morphology, and optical properties of the obtained oxides were investigated. The results showed that the size of crystallites and the agglomeration degree of particles decreased with increasing nickel content, while the band gap value was not significantly affected by nickel substitution. The fluorescence spectra exhibited similar patterns but different intensities of emission bands for all samples.
Article
Metallurgy & Metallurgical Engineering
Francis Gyakwaa, Matti Aula, Tuomas Alatarvas, Qifeng Shu, Marko Huttula, Timo Fabritius
Summary: Raman spectroscopy is used to quantify specific phases in a multiphase synthetic inclusion mixture in the CaO-Al2O3-MgO-CaS system, with satisfactory prediction performance demonstrated using partial least squares regression and standard normal variate data processing.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Francis Gyakwaa, Tuomas Alatarvas, Qifeng Shu, Timo Fabritius
Summary: Raman spectroscopy and FESEM-EDS techniques are used to rapidly and accurately analyze the properties and content of oxide and sulfide-based non-metallic inclusions in steel samples.
Article
Materials Science, Ceramics
Ruiqi Zhang, Peter Gethin
Summary: The earliest use of cobalt on porcelain can be traced back to the Tang dynasty, but it was not until the late Yuan dynasty that the production of widely known blue-and-white porcelain in Jingdezhen matured. Studies have focused on the sources of blue pigments used in the Yuan and Ming dynasties. Analysis of blue-and-white porcelain fragments from Jingdezhen minyao sites revealed a closer correlation of cobalt pigments used during the Kangxi, Yongzheng, and Qianlong reigns to Yunnan asbolites rather than the previously accepted Zhejiang asbolites.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Prajna P. Mohapatra, Hodam Karnajit Singh, Mangalampalli S. R. N. Kiran, Pamu Dobbidi
Summary: In this study, Co-substituted Ni-Zn ferrites were synthesized, and their structural and magnetic properties were investigated. The results showed that Co substitution led to an increase in crystallite size and lattice constant, as well as a suppression of Raman peak intensity and shift towards a lower wavenumber. The dielectric properties and magnetic response of the samples were also affected by Co substitution. At low temperatures, the Co-substituted ferrites exhibited a giant coercivity and high effective magnetocrystalline anisotropy.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
H. H. Abo-almaged, W. H. Hegazy, M. S. Azmy, R. M. Khattab
Summary: This study aims to fabricate colored pigment materials from recycling fly ash pollutants by extracting alpha alumina and utilizing different transition metals to prepare metal cobalt aluminate spinel structures. The sintering temperature was found to significantly influence the physic-mechanical, magnetic, and electrical properties of the spinels. The addition of transition metal ions to the CoAl2O4 structure plays a key role in determining the characteristics of the produced spinels.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Review
Chemistry, Analytical
Jan Jehlicka, Howell G. M. Edwards, Aharon Oren
Summary: This review discusses the application of Raman spectroscopy in studying violet and brown pigments produced by microorganisms. Raman spectroscopy is a widely appreciated analytical tool in the field of microbiology and chemistry, and its recent developments have opened up new possibilities for studying microbial colonization in natural geobiological systems.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2022)
Article
Materials Science, Ceramics
Man Zhang, Jianhua Liu, Junwen Zhou
Summary: The effect of Eu2O3 doping amount on the densification behavior of MgAl2O4 and its corrosion resistance to aluminum electrolyte was studied. The results showed that Eu2O3 doping contributed to the densification of MgAl2O4, and the sample with 3 wt.% Eu2O3 had the highest relative density and hardness. Additionally, this sample exhibited the best corrosion resistance to aluminum electrolyte.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Applied
Renata Rozylo, Monika Szymanska-Chargot, Urszula Gawlik-Dziki, Dariusz Dziki
Summary: The present study successfully prepared blue colored powders from cornflower petals through low temperature aqueous extraction and freeze-drying microencapsulation with 10% stabilizer mixture. The addition of 2% guar gum to maltodextrin was found to be the most optimal, significantly increasing process efficiency. The blue powders exhibited high antioxidant activity and total phenolic content.
Article
Materials Science, Ceramics
Dan Zhao, Yi Feng, Zhipeng Pi, Fan Zhang
Summary: Phase equilibria in the ZrO2-GdO1.5-TaO2.5 (ZGTO) system were experimentally investigated, and the differences between ZGTO and the existing ZrO2-YO1.5-TaO2.5 (ZYTO) were discussed. The study is useful for thermodynamic assessment of ZGTO and can guide the design of novel thermal barrier coatings materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yutaka Ohya, Wingki Mey Hendra, Chika Takai-Yamashita, Takayuki Ban
Summary: Diffusion couples of rutile and corundum single crystals were prepared and examined to study the solid solution and precipitation of corundum in rutile during cooling. Different precipitation forms of corundum were observed under different cooling conditions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiaming Zhan, Yunfa Guo, Hao Wang
Summary: This study systematically investigates the mechanical behaviors of calcium fluoride in humid environments. The effects of water on the deformation and plastic enhancement of CaF2 under indentation are explored through microindentation experiments, atomic simulations, and Raman spectroscopy measurement.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hangfeng Zhang, Henry Giddens, Theo Graves Saunders, Matteo Palma, Isaac Abrahams, Haixue Yan, Yang Hao
Summary: The relationship between low and high frequency tunabilities in tin substituted barium titanate ceramics was investigated. It was found that there are differences in tunabilities at different frequencies due to the different activities of larger ferroelectric domains and polar nanoclusters.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Kaibiao Xi, Jiacheng Liu, Beibei Song, Huarong Cheng, Yihao Li, Xiaole Yu, Mupeng Zheng, Mankang Zhu, Yudong Hou
Summary: Composite modulation in the superparaelectric state of the BTBZ-CT system is proposed as an effective strategy to achieve both NTCC and excellent energy storage performance in dielectric ceramics. The addition of BZ and CT to BT ferroelectrics can move the SPE state to the normal use temperature zone, resulting in enhanced NTCC characteristics and energy storage performance. Furthermore, intentional precipitation of CT at grain boundaries can refine the grain size, increase the bandgap, and strengthen the local electric field distribution, thereby enhancing the breakdown electric field.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hamed Salimkhani, Lovro Fulanovic, Till Froemling
Summary: The demand for robust multilayer ceramic capacitors with high-temperature and high-power capabilities is increasing rapidly. However, cost-effective production is a challenge. This study investigates the use of Na0.5Bi0.5TiO3-based materials as promising lead-free options. By adding sintering aids, the sintering temperature of Na0.5Bi0.5TiO3-BaTiO3-CaZrO3-BiAlO3 solid solutions was successfully reduced to 975 degrees C, suitable for co-sintering with Cu electrodes without adverse effects on capacitor properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Mingxing Li, Ran Mo, Zeshui Xu, Jie Zhou, Conglin Zhang, Xuefeng Cui, Fang Ye, Laifei Cheng, Ralf Riedel
Summary: Polymer infiltration and pyrolysis is an effective method for preparing ceramic matrix composites. The transformation of polymer to ceramic during the process affects the residual stress and interface behavior in the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yan Kang, Lin Chen, Chang-Jiu Li, Guan-Jun Yang
Summary: A novel abradable seal coating with low hardness and high bonding strength was successfully designed and prepared. This coating has significantly higher abradability and erosion resistance compared to metal-based coatings, and can retain excellent abradability and have a long lifetime during service.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Qingzhong Song, Xiangdong Zha, Ming Gao, Yingche Ma
Summary: This study analyzes the influence of calcia refractory purity on the properties of calcia crucibles. Higher purity calcia results in well-developed grains and improved hydration resistance, leading to better high-temperature strength and thermal shock resistance. In contrast, lower purity calcia crucibles exhibit inferior properties. Therefore, high-purity calcia is considered a potential refractory for manufacturing oxide crucibles.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sehreish Abrar, Faisal Nazeer, Zhuang Ma, Ling Liu, Abdul Malik, Mustafa Kamal, Abdullah G. Al-Sehemi
Summary: To raise the operating temperature of Si-based ceramic matrix composites (CMCs), researchers have applied thermal/environmental barrier coating (T/EBCs) materials, typically rare earth silicates. However, the high thermal conductivity and the mismatch of thermal expansion have been major challenges in developing new materials that can offer thermal insulation and environmental protection to CMCs. In this study, entropy engineering was used to create a multicomponent equi-atomic single-phase pyro silicate with extremely low thermal conductivity and enhanced water vapor corrosion resistance. The research findings show the potential of high entropy disilicates in achieving ultra-low thermal conductivity and low weight loss in corrosive environments.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zi-bo Niu, Daxin Li, Dechang Jia, Zhihua Yang, Kunpeng Lin, Paolo Colombo, Ralf Riedel, Yu Zhou
Summary: In this study, SiBCN ceramics with a special structure were prepared to improve the oxidation resistance. The effect of the structure on oxidation behavior and kinetics was investigated, revealing that the special structure can effectively inhibit heterogeneous oxidation and enhance the oxide layer composition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Melike Donmez, Metehan Erdogan, Cihangir Duran
Summary: The limited densification of CeO2 ceramics was improved by using an anorthite-based glass, resulting in high dielectric constant and quality factor with minimum dielectric loss. The CeO2-(anorthite-based) glass ceramic showed promising results in terms of low temperature densification and microwave properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
S. Rahmati, R. G. A. Veiga, J. Mostaghimi, T. Coyle, A. Dolatabadi
Summary: This study provides an atomic-scale description of the high-velocity impact of alpha-Al2O3 particles onto an alpha-Al2O3 substrate during Aerosol Deposition (AD). The results suggest that the crystal orientation plays a crucial role in both plasticity and damage of the nanoparticles. Impact velocity has a direct correlation with plasticity and fragmentation, but adhesion efficiency has only a marginal increase. The crucial element lies in the substrate's surface alterations caused by the fragments left on the substrate after impact.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Bo-Wen Chen, Yan-Mei Kan, De-Wei Ni, Chun-Jing Liao, Hong-Da Wang, Yu-Sheng Ding, Shao-Ming Dong
Summary: This study characterized the long-term and repeated ablation properties of modified Cf/HfC-SiC composites with YB4-Al2O3-Si3N4 under an air plasma torch. The structural stability and viscosity of the oxide layer were found to affect the ablation resistance of the composites. By forming nano c-HfO2 grains and high-viscosity Al-Si-Y-O glassy phase, the structural stability of the oxide layer was improved, resulting in enhanced ablation resistance. However, the oxidation of Si3N4 led to the formation of NO, NO2, and excessive SiO2 glassy phase, which resulted in a porous structure and reduced the viscosity of the oxide layer. Therefore, the addition of Si3N4 decreased the ablation resistance of the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yongxing Wei, Huawei Zhang, Siyuan Dong, Changqing Jin, Chenxing Bai, Junle Dai, Zengzhe Xi, Zhonghua Dai, Zengyun Jian, Li Jin
Summary: In this study, solid solutions of xBi(Ni1/2Hf1/2)O-3-(1 - x)PbTiO3 (xBNH-PT) were synthesized to investigate their phase boundary behaviors and physical properties. The presence of a tetragonal-pseudocubic phase boundary and a spontaneous ferroelectric-relaxor transition at specific compositions were confirmed. The introduction of a tetragonal-pseudocubic phase boundary improved the piezoelectric properties and suppressed the spontaneous ferroelectric-relaxor transition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)