Article
Engineering, Electrical & Electronic
Sourabh Sharma, Ashok Kumar, O. P. Thakur
Summary: This research provides insights into the effects of Gd substitution on the structural, magnetic, and dielectric properties of Bismuth ferrite. The study reveals that Gd substitution leads to structural distortion, decrease in magnetic ordering parameters, and impact on dielectric properties. Microstructural analysis, electron paramagnetic resonance, and dielectric spectroscopy support the findings.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoya Chen, Quanan Li, Yao Zhou, Peijun Chen
Summary: The Mg-11Gd-2Y-3Sm-0.5Zr (GWS1123) alloy was prepared by vacuum melting and gas protection. Tensile mechanical properties at 20-300 degrees C and creep properties at 200-300 degrees C/50-110 MPa were tested. Microstructure changes were investigated and the strengthening and creep mechanisms were discussed. GWS1123 alloy exhibited excellent creep properties at high temperatures.
Article
Materials Science, Ceramics
Inna A. Zvonareva, Anna V. Kasyanova, Artem P. Tarutin, Gennady K. Vdovin, Julia G. Lyagaeva, Dmitry A. Medvedev
Summary: Systematic studies on BaZr0.8-xSnxSc0.2O3-delta revealed that the composition with x = 0.1 exhibits the highest values in terms of ionic and grain conductivities. Low-level substitution of Zr4+ with Sn4+ ions shows promise in designing new proton-conducting electrolytes for high-temperature applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Hao Pang, Quanan Li, Xiaoya Chen, Peijun Chen, Xiangyu Li, Jinfeng Tan
Summary: The deformation behavior of Mg-Gd-Y(-Sm)-Zr alloys during high-temperature uniaxial compression was investigated. The dynamic recrystallization critical strain was calculated and verified. The hot deformation activation energy and constitutive equation were calculated, and the effect of Sm on microstructure evolution was analyzed. The results showed that the addition of Sm increased flow stress and delayed dynamic recrystallization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Daniel Podgornii, Francoise M. Amombo Noa, Jan van Leusen, Christine J. McKenzie, Lars Ohrstrom, Paul Koegerler, Svetlana G. Baca
Summary: A new series of heterometallic wheels were synthesized and characterized. These wheels consist of trinuclear mu(3)-oxo-linked or hexanuclear mu-OH-linked Fe(III) pivalate clusters and rare earth nitrates. The magnetic studies revealed antiferromagnetic exchange interactions within the Fe-3 trimeric unit, as well as ferromagnetic exchange interactions between the Fe(III) and Ln(III) centers when diamagnetic Y(III) is substituted by paramagnetic Ln(III).
CRYSTAL GROWTH & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Wanman Mei, Hao Pang, Quanan Li, Xiaoya Chen
Summary: Twining plays a crucial role in adjusting the mechanical properties and microstructure of magnesium alloys at room temperature deformation. This study investigated the effect of the Sm element on twinning behavior by compressing the Mg-6Gd-3Y(-3Sm)-0.5Zr alloy at room temperature. The results revealed that the presence of Sm resulted in a higher quantity of fine cross twinning, leading to changes in orientation differences and matrix division. These changes contributed to the strengthening of fine grains and increased deformation stresses in the Mg-Gd-Y-Sm-Zr alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Franziska Hess, Bilge Yildiz
Summary: Perovskite oxides degrade at elevated temperatures while precipitating dopant-rich particles on the surface. A knowledge-based improvement of surface stability requires a fundamental and quantitative understanding of the dopant precipitation mechanism on these materials. Our study reveals that precipitation of dopants is influenced by various factors in different electrolytic and fuel cell conditions. Through the use of a model system and defect model, it is possible to predict and understand the mechanism of dopant precipitation.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Yanbo Pei, Meng Yuan, Enbo Wei, Menghua Yu, Bugang Teng
Summary: Strain rate plays a crucial role in the hot deformation process of materials. This study investigates the deformation behavior and microstructure evolution of Mg-Gd-Y-Sm-Zr alloy at different strain rates, and discusses the mechanism of dynamic recrystallization.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Electrochemistry
Lei He, Feng Zhang, Yan Xuan, Lei Zhang, Huiying Gao, Huaqing Pan, Sen Lian, Mingyue Wang, Jikang Yin, Xue Chen, Junfeng Ren, Meina Chen
Summary: This study utilized first-principles calculations to investigate the effects of Nd and Y co-doping on the surface and bulk properties of hydration reaction and proton conduction in BaZrO3. The results showed that Nd and Y promoted the accumulation of oxygen vacancies and protons on the surface, facilitating the hydration reaction and promoting proton transmission. The segregation of Nd and Y also had beneficial effects on proton transport through grain boundaries in BZNY.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Jagoda Budnik, Aleksandra Mielewczyk-Gryn, Maria Gazda, Tadeusz Miruszewski
Summary: This study investigated the water uptake and oxygen transport properties of BaCe0.6Zr0.2Y0.1M0.1O3-delta samples at different pH2O using Thermogravimetry and Electrical Conductivity Relaxation methods. The results showed proton incorporation into the materials during the switch from dry to wet atmospheres. The kinetics of the water uptake process varied depending on the substituent used, and the pO2 dependence of total conductivity allowed for the determination of partial conductivities in BCZYTb.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Xiaorong Zhang, Lulu Jiang, Shihang Guo, Donglin Han
Summary: In this work, a class of ionic conductor with a cubic pyrochlore structure was investigated, and two strategies were adopted to increase the concentration of oxygen vacancies. Doping Ca, Sr, and Ba further promoted the proton conduction. The study results indicated that only specific oxygen vacancy positions played a role in hydration.
Article
Materials Science, Multidisciplinary
Yanbo Pei, Meng Yuan, Enbo Wei, Bugang Teng
Summary: A new Mg-5.5Gd-3Y-1Sm-0.5Zr (1Sm) alloy was developed, and its deformation behavior and microstructure evolution during hot compression were studied. The addition of Sm element was found to affect the workability and dynamic recrystallization behavior of the alloy. Sm element increased the thermal activation energy and reduced the discontinuous dynamic recrystallization at certain temperatures. The study also revealed that Sm element weakened the basal texture and affected the recrystallization process.
MATERIALS & DESIGN
(2023)
Article
Physics, Applied
Liang Zhao, Jirong Liu, Yi Zhao
Summary: Through theoretical simulations and comparative analysis, this study revealed that La doping in HZO has the strongest stabilization effect on the ferroelectric phase, contributing to improved endurance. Additionally, La, Al, or Y dopants were found to increase oxygen vacancy formation energy and reduce the susceptibility of HZO to dielectric breakdown. These findings provide guidance for designing doping methods and concentrations to enhance endurance in HZO ferroelectrics.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Sikander Azam, Banat Gul, Nargis Ali, Khalil Ahmad, Rashid Khan, H. H. Hegazy, Wilayat Khan, Sikandar Aftab, Altaf Ur Rahman
Summary: This study investigated the electrical and optical properties of Ba2MLnSe5 (M = Ga, In; Ln = Y, Nd, Sm, Gd, Dy, Er) using density functional theory and WIEN2k code. The compound was found to exhibit semiconducting nature and covalent character. Optical properties, such as dielectric function, optical conductivity, refractive index, and absorption coefficient, were predicted. The compound showed minimal reflection and maximal absorption in the infrared to visible light range, making it suitable for applications in remote sensing and surgical equipment.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Materials Science, Ceramics
Nathaniel S. S. Olson, Frances I. I. Hurwitz, Jamesa L. L. Stokes, Haiquan Guo, Richard B. B. Rogers, Jessica A. A. Krogstad
Summary: The high porosities and low densities of ceramic aerogels offer excellent insulation performance in weight-sensitive applications. However, the high surface area-to-volume ratios and specific surface areas lead to rapid densification of the pore structure at elevated temperatures, limiting their use in high-temperature applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)