Article
Thermodynamics
Clement Mailhe, Stephane Gorsse, Boece Thirion, Elena Palomo, Marie Duquesne
Summary: The IRT method is a new dynamic calorimetry method based on infrared thermography that has been proven to efficiently establish phase diagrams of binary systems of organic materials. It shows potential for application in ternary systems with increased complexity.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Materials Science, Multidisciplinary
E. Epifano, D. Monceau
Summary: Ellingham diagrams are thermodynamic tools used to compare the stability of oxides, commonly for pure metals. However, due to difficulties in obtaining experimental chemical activity data, Ellingham diagrams for complex industrial alloys are rarely reported. This study shows how advanced thermodynamic databases can be used to address this issue by computing the Ellingham diagrams for four widely used alloys and discussing their oxidation behavior and differences from the Ellingham diagrams of pure metals.
Article
Thermodynamics
Clement Mailhe, Marie Duquesne
Summary: The infrared thermography method for estimating phase diagrams is being challenged in terms of its potential, given its simplicity, speed, and relatively low cost. A test campaign is underway to evaluate the impact of experimental parameters on the method's efficiency, focusing on acquisition frequency and heating rate. The study has assessed the accuracy of estimated phase diagrams for three binary systems and identified optimized parameters for further improving the method.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Physics, Multidisciplinary
S. Borsanyi, Z. Fodor, J. N. Guenther, R. Kara, S. D. Katz, P. Parotto, A. Pasztor, C. Ratti, K. K. Szabo
Summary: This Letter introduces a new scheme for extrapolating the equation of state of QCD to finite chemical potential with improved convergence properties, allowing extension to high baryonic chemical potentials. The continuum extrapolated lattice results for the new expansion coefficients are presented, showing thermodynamic observables up to mu(B)/T <= 3.5. This novel expansion overcomes the limitations of traditional Taylor expansion methods, providing a solution to the poor signal-to-noise ratio in determining Taylor coefficients from lattice calculations.
PHYSICAL REVIEW LETTERS
(2021)
Review
Pharmacology & Pharmacy
Marek Wesolowski, Edyta Leyk
Summary: Using multiple measurement techniques ensures reliable interpretation of sample changes during heating, eliminating uncertainty and improving data interpretation. This paper briefly characterizes thermal analysis techniques coupled with spectroscopic or chromatographic techniques. Various design solutions for coupled thermogravimetry (TG) with infrared spectroscopy (FTIR), mass spectrometry (MS), and gas chromatography/mass spectrometry (GC/MS) systems are discussed. The importance of coupled techniques in pharmaceutical technology is highlighted, as they provide insights into the behavior and degradation of medicinal substances during heating, allowing determination of decomposition mechanisms and prediction of shelf life and storage conditions. In addition, design solutions for interpreting differential scanning calorimetry (DSC) curves using observation or simultaneous recording of FTIR spectra and X-ray diffractograms (XRD) are characterized, addressing the inherent non-specificity of DSC.
Article
Chemistry, Physical
Maria Zdanowska-Fraczek, Krystyna Holderna-Natkaniec, Lukasz Lindner
Summary: The study on TeAHSe electrolyte system using solid-state H-1 NMR technique revealed that the main charge transport mechanism in the superionic phase is NH4+ cation diffusion. Additionally, ammonium cations were found to be involved in the low-temperature structure recovery in TeAHSe crystal, providing insights into the phase transformation mechanism.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Zijian Su, Shuo Liu, Benlai Han, Yuanbo Zhang, Tao Jiang
Summary: This study successfully developed a novel process for the preparation of sodium stannate from cassiterite concentrates, which is widely used in ceramics and electroplating industries. It was found that the main gangue of quartz in cassiterite concentrates easily formed sodium stannosilicate (Na8SnSi6O18), decreasing the quality of Na2SnO3. The study also determined the formation and transitions of Na8SnSi6O18 in the SnO2-SiO2-Na2CO3 system under a CO-CO2 atmosphere.
Article
Thermodynamics
D. Piotrowska, I. Szczygiel
Summary: Phase equilibria and primary crystallization fields were established in the ErPO4-KPO3-Er(PO3)(3) partial system. Two polythermal binary cross-sections and three invariant points were determined, with the alloy crystallization ending in a ternary eutectic. The studies were conducted using thermoanalytical methods and powder X-ray diffraction analysis.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Materials Science, Ceramics
Huaiqian Li, Hao Yang, Jian Shi, Yingchun Ma, Jingchang Cheng, Peng Gao, Zhiquan Miao, Bo Yu, Yanpeng Wei
Summary: Gd2WO6 precursor powder was prepared from Gd2O3 and WO3 via a high-temperature solid-state reaction. Gd2WO6 ceramics with relative densities more than 95% were prepared by secondary sintering method. The effects of temperature on Gd2WO6 phase composition, microstructure, and properties of the ceramic materials were studied.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Kamel Atamnia, Soufyane Satha, Hamid Satha, Maurice Francois Gonon
Summary: The glass samples used in the study are completely lead-free and have properties similar to traditional lead crystal glass. The results of the study highlight the influence of glass composition on structural properties, as well as the effect of composition on thermal properties as confirmed by DSC analysis.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Physics, Applied
Yifei Wang, Xinxin Fan, Xiaoyu Feng, Xiaohu Gao, Yunfei Ke, Jiguang Yao, Muhan Guo, Tao Wang, Lvkang Shen, Ming Liu, Desheng Xue, Xiaolong Fan
Summary: This study investigates the damping behavior of LSMO epitaxial films as a function of thickness and temperature. The competition between two scattering types, s-like and ?-like, results in complex damping behavior. The behavior of s-like damping is consistent with magnetic metal films, while ?-like damping is greatly influenced by the distortion of oxygen octahedra controlled by film thickness.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Ceramics
Avishak Chatterjee, Ning Liao, Tengteng Xu, Shaobai Sang, Yawei Li, Pawel Stoch, Ilona Jastrzebska, Jacek Szczerba, Mithun Nath
Summary: A new high-temperature ternary Cr(III) phase (Wuboraite, CaAl2Cr2IIIO7) was synthesized in the Al2O3-CaO-Cr2O3 system. The formation and chemical transformation mechanism of Wuboraite have not been explored in detail. Through solid-state reaction using XRD, TG-DSC, XPS, and leaching tests, the system between 500 and 1600 degrees C under air and argon atmosphere was investigated. Wuboraite formation starts at different temperatures (-1500 &-1100 degrees C) under different atmospheres (air and Ar), with intermediate compounds CaCrVIO4 and CaCr2IIIO4 playing a crucial role in wuboraite conversion.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Takashi Tayama, Yusuke Kani, Momota Imai, Yuta Kanai, Hitoshi Sugawara
Summary: The results of magnetization, thermal expansion, and magnetostriction measurements of CeOs4Sb12 reveal magnetic anisotropy and phase differences in the ordered phases A, B, and C. The magnetization at low temperatures in high magnetic fields shows significant anisotropy, with the ratio M[100] > M[110] > M[111] consistent with the xe002;67 quartet. The comparison between experimental results and numerical calculations suggests that the C phase is an antiferroquadrupolar ordered state, mainly influenced by antiferro-octupolar interaction.
Article
Materials Science, Ceramics
Zheng Wang, Yuxuan Sun, Zhenyong Man, Xuezheng Ruan, Xue Shi, Liaoying Zheng, Guorong Li, Ding Wang
Summary: This study successfully reduced the sintering temperature of lead-based piezoelectric ceramics by doping Li2CO3 and CuO as low-temperature sintering aids, resulting in excellent piezoelectric properties. Furthermore, it was found that co-doping of Li2CO3 and CuO has a negative impact on the piezoelectric properties.
CERAMICS INTERNATIONAL
(2023)
Article
Thermodynamics
J. Leitner, K. Hornikova, N. Studnickova, D. Sedmidubsky
Summary: The solid-liquid equilibria of three binary systems involving paracetamol (PAR) were investigated using differential scanning calorimetry (DSC). It was found that all three systems exhibited eutectic behavior, with eutectic temperatures of 386.1 K, 355.6 K, and 348.1 K for PAR-PEP.HCl, PAR-TMD.HCl, and PAR-IBU, respectively.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Mamoru Sakai, Chengkun Wang, Takashi Okiba, Haruki Soga, Takuya Hashimoto
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Correction
Chemistry, Physical
R. A. Budiman, S. Hashimoto, Y. Fujimaki, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada
SOLID STATE IONICS
(2021)
Article
Energy & Fuels
Qiuyu Liu, Chenghao Jia, Mengzhen Zhou, Zuyun He, Zhiheng Gong, Yihan Ling, Xinxin Wang, Keiji Yashiro, Yan Chen
Summary: By shrinking the size of SrNb0.1Co0.7Fe0.2O3-delta (SNCF) to the nanoscale, a modulated reaction pathway has been reported which leads to significantly enhanced OER activity. Oxygen vacancies on the surface of SNCF nanofibers were found to decouple the proton and electron transfer, as revealed by pH dependence study and H/D isotopic labeling experiments.
Article
Chemistry, Physical
Yige Wang, Chuan Jia, Zewei Lyu, Minfang Han, Junwei Wu, Zaihong Sun, Fumitada Iguchi, Keiji Yashiro, Tatsuya Kawada
Summary: The study demonstrates that dense GDC interlayers with a thickness of 1 mm can be successfully manufactured using the physical vapor deposition method. The GDC interlayer sintered at 1100 degrees C exhibits the lowest degradation rate during cell operation, attributed to its most effective inhibition of Sr diffusion.
JOURNAL OF MATERIOMICS
(2022)
Article
Materials Science, Multidisciplinary
Yuta Kimura, Takashi Nakamura, Koji Amezawa, Keiji Yashiro, Tatsuya Kawada
Summary: This study evaluated the elastic moduli of LN214, a potential cathode material for SOFCs, using the resonance method, finding that the elastic moduli decrease with increasing interstitial oxygen concentration. Analysis based on numerically obtained lattice energy showed that the P(O-2) dependence of the Young's modulus of LN214 is essentially explained by variations in the c-lattice constant triggered by changes in interstitial oxygen concentration. These findings contribute to a better understanding of the relationship between lattice defects and mechanical properties, ultimately improving the mechanical stability of SOFCs.
Article
Multidisciplinary Sciences
Kazuhisa Sato, Satoshi Watanabe, Yihui Huang, Taihei Miyasaka, Toshiaki Matsui, Keiji Yashiro, Tatsuya Kawada, Koji Amezawa, Keigo Kumada, Koichi Eguchi
Summary: This paper discusses the relationship between the elongation and compression behavior and microstructural changes under redox cycles of porous Ni(O)-YSZ cermets for solid oxide fuel cells (SOFC). The study observed the microstructural changes of Ni(O)-YSZ cermet by reduction, re-oxidation and re-reduction, and proposed a simple model considering the initial porosity and Ni content to predict dimensional changes due to re-oxidation. Cermets with high Ni content show large initial dimensional changes, but the dimensional reversibility improves with an increase in the number of redox cycles.
SN APPLIED SCIENCES
(2021)
Article
Engineering, Multidisciplinary
Zaka Ruhma, Keiji Yashiro, Itaru Oikawa, Hitoshi Takamura, Tatsuya Kawada
Summary: This study focuses on the effects of pore former in metal slurry on the sintered layer of metal-supported SOFC, showing that changing the amount of pore former in the slurry can alter the sinterability of the metal layer and subsequently impact the final warpage state of the cell. The research helps in understanding the sintering phenomena between layers of metal-supported SOFCs.
JOURNAL OF ENGINEERING AND TECHNOLOGICAL SCIENCES
(2021)
Article
Chemistry, Physical
Junya Tanaka, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Toshiyuki Hashida
Summary: This study investigates the deformation behavior of the anode during reduction and the effect of reduction conditions using NiO-YSZ. It is found that the Ni volume fraction is a major factor, with low Ni volume fraction samples showing expansion and high Ni volume fraction samples showing shrinkage. The expansion behavior is due to the release of compressive residual stress on the YSZ side during reduction.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Physical
Junya Tanaka, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Toshiyuki Hashida
Summary: The microstructure of anodes significantly affects their deformation, with different deformation mechanisms classified based on analysis. Numerical analysis demonstrates that larger anode deformation leads to higher cell stress, potentially impacting mechanical reliability of cells. Selecting optimal anode composition can prevent cell stress change due to anode deformation. The YSZ-Ni content diagram provides fundamental knowledge for designing optimal microstructure in anodes of SOFCs.
JOURNAL OF POWER SOURCES
(2022)
Article
Materials Science, Ceramics
Takayuki Sugimoto, Takuya Hashimoto, Takato Takemura, Daisuke Yokota, Hiroki Fujimori
Summary: Aluminum titanate-glass sintered composites with controlled thermal expansion coefficient were successfully prepared. A zero-thermal-expansion material could be obtained when the glass addition was 5-7 wt%. No chemical reaction between glass and Al2TiO5 was observed during sintering. The glassy phase at the grain boundary increased the thermal expansion coefficient and apparent density.
CERAMICS INTERNATIONAL
(2023)
Article
Electrochemistry
Mirai Takeda, Keiji Yashiro, Riyan Achmad Budiman, Shinichi Hashimoto, Tatsuya Kawada
Summary: Electrochemical measurements are conducted on a Ni-dense electrode in a YSZ electrolyte to investigate the relationship between capacitance and double-phase boundary (DPB) of Ni-YSZ. By varying the electrode diameter, the capacitance is found to be proportional to the DPB area. This correlation is further confirmed in electrochemical measurements of the Ni-YSZ porous electrode using a transmission-line model.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Riyan Achmad Budiman, Shin-Ichi Hashimoto, Deni Shidqi Khaerudini, Keiji Yashiro, Tatsuya Kawada
Summary: This study determines the oxygen vacancy concentration (delta), electrochemical reaction, and durability of LaNiO3-delta, a perovskite-type oxide, as functions of temperature (773-1073 K) and oxygen partial pressure. The results show that LaNiO3-delta has a higher oxygen partial molar enthalpy at delta approximate to 0, indicating the ease of oxygen vacancy formation. The electrochemical properties and durability of LaNiO3-delta were investigated, and impedance spectra analysis revealed three components of the electrode reaction. Further experiments demonstrated the stable performance of the LaNiO3-delta porous electrode under specific conditions.
SOLID STATE IONICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Shumpei Iwasaki, Kosuke Shido, Takuya Hashimoto
Summary: The preparation of Li3NaSiO4 powder, which is used as a CO2 absorbent, was optimized in this study. It was found that using Li4SiO4, Li2SiO3, and Na2CO3 mixture as starting materials resulted in a higher purity Li3NaSiO4 powder with a larger surface area and homogeneous particle size, as well as a higher CO2 absorption capacity.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Manami Hirai, Eiki Niwa, Takuya Hashimoto
Summary: Li3NaSiO4 as a CO2 absorbent exhibits a reversible absorption and desorption reaction with CO2, showing a higher absorption rate than Li4SiO4. The properties of Li3NaSiO4 are similar to Li4SiO4 under different CO2 partial pressures, with diffusion process identified as the rate-determining step for CO2 absorption at examined temperatures and P(CO2).
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Eiki Niwa, Tsubasa Sato, Takuya Hashimoto
DALTON TRANSACTIONS
(2020)