Article
Chemistry, Physical
Arindom Chatterjee, Zhenyun Lan, Dennis Valbjorn Christensen, Federico Bauitti, Alex Morata, Emigdio Chavez-Angel, Simone Sanna, Ivano E. Castelli, Yunzhong Chen, Albert Tarancon, Nini Pryds
Summary: The study focused on the fabrication of thermoelectric thin films doped with SrTiO3-based oxides, showing a decrease in electrical conductivity, carrier density, and thermoelectric Seebeck coefficient as the film thickness decreases.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Ceramics
Alireza Ramezani, Hossein Abdizadeh, Mohammad Reza Golobostanfard
Summary: BaTiO3 and SrTiO3 thin films and BaTiO3/SrTiO3 lamellar composites were successfully synthesized using the sol-gel spin-coating method in this study. The morphology and band gap of the composite samples could be altered by changing the periodicity of the samples. The optical properties of the multi-stacked composites, including dielectric constant, dielectric loss, impedance, Urbach tail, extinction coefficient, and electric modulus, were also investigated.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Jie Wu, Gaochao Zhao, Chengbing Pan, Kun Tao, Jie Yang, Xuebin Zhu, Peng Tong, Lihua Yin, Wenhai Song, Yuping Sun
Summary: We investigated the effect of A-site disorder on the properties of lead-free Ba1-x-ySrxCayTiO3 perovskites and found that decreasing A-site disorder leads to reduced tetragonal distortion, ferroelectric transition temperature, and the temperature of the maximum electrocaloric effect. By optimizing the A-site disorder, the highest adiabatic temperature change can be achieved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Jonas Wawra, Kornelius Nielsch, Ruben Huehne
Summary: Substrate-induced strains can significantly affect the structural and functional properties of epitaxial thin films. By growing epitaxial Ba0.7Sr0.3TiO3 films on REScO3 substrates with smaller lattice mismatch, the quality of the films was improved compared to SrTiO3. The strain state of the functional layer depended on the substrate and thickness, leading to differences in permittivity and polarization behavior at different temperatures.
Article
Chemistry, Physical
M. A. Khan, L. Braic, Y. AlSalik, H. Idriss
Summary: Monolithic integration of metal oxide thin films with conventional semiconductors such as silicon and germanium allows for new functionalities in semiconductor devices. Using pulsed laser deposition (PLD), epitaxial strontium titanate (STO) films were grown on Ge (001) single crystal, achieving a sharp interface without interfacial amorphous oxide layer by optimizing surface preparation and deposition conditions. Factors such as Ge(001) surface substrate cleaning, growth temperature, oxygen partial pressure, and laser energy density are discussed for their effects on STO film growth, with the presence of O-2 leading to growth on (100) and (110) planes.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
B. Magalhaes, S. Engelhardt, C. Molin, S. E. Gebhardt, K. Nielsch, R. Huehne
Summary: The study investigated the correlation between structural parameters and the electrocaloric effect in lead-free epitaxial Ba1-xSrxTiO3 (BSTO) thin films. It was found that as the Sr content increased, the temperature of maximum permittivity decreased, and a relaxor-like behavior was observed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Ye Zhao, Qian Wang, Jun-Hu Lv, Xian Zhao, Chun-Ming Wang
Summary: In this study, Y-modified BaTiO3 ceramics with different yttrium doping levels were prepared, and BT-2.5Y showed the highest electrocaloric effect performance. This indicates that BT-100xY ceramics have great potential for applications.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Bo Guo, Yao Guo, Lianqiang Xu
Summary: In this study, Bi2O2X/SrTiO3 heterostructures were constructed and their geometric, electronic, optical, and transport characteristics were investigated using density functional theory and non-equilibrium Green's function calculations. The results highlighted the influence of chalcogen elements on the stability and properties of the interfaces. The Bi2O2S/SrTiO3 interface exhibited the best stability, while the Bi2O2Te/SrTiO3 interface showed the best optical properties and enhanced electron transport.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Mechanics
D. L. Shan, C. H. Lei, Y. C. Cai, K. Pan, Y. Y. Liu
Summary: This study presents a mesoscopic mechanical control method, based on entropy analysis, to manipulate the electrocaloric response in epitaxial ferroelectric thin films for practical cooling applications at different temperatures. By adjusting the chemical composition, misfit strain, and external stress, it is possible to control the phase structures, phase transition temperatures, and electrocaloric response in BaxSr1-xTiO3 thin films.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Materials Science, Ceramics
C. Molin, T. Richter, S. E. Gebhardt
Summary: This study optimized the electrocaloric properties of a lead-free material system based on barium titanate by introducing strontium and tin, leading to the preparation of solid solutions with high EC effect at room temperature and a wide temperature range. The influence of different Sn:Sr ratios on dielectric and ferroelectric properties was investigated, with the most promising results achieved for the BSSnT-18-6.5 composition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Pei-Hsuan Chan, Huang-Ping Teng, Hsun-Shu Chan, Fu-Hsing Lu
Summary: Barium strontium titanate (BaxSr1-xTiO3; BST) thin films were successfully produced on TiN-coated Si substrates by a hydrothermal-galvanic couple (HT-GC) method in alkaline solutions containing Ba(CH3COO)2 and Sr(CH3COO)2. The films exhibited a promising dielectric tunability that could reach as high as 92%, with Sr ions more readily incorporated into the films than Ba ions, leading to a transition from Sr-rich to Ba-rich BST as the mole fraction of Ba2+ in the reaction solutions increased. The epitaxial-like growth of (111) BST films over (111)-oriented TiN underlayer was observed for all obtained films.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Shi-Bin Wang, Guang-Zhou Dai, Ying-Bang Yao, Xiao-Bo Zhao, Tao Tao, Bo Liang, Sheng-Guo Lu
Summary: With the addition of 0.5 wt% B2O3-ZnO glass phase, the breakdown electric field of BST ceramic can be increased, and the adiabatic temperature change is enhanced from 1.70 K to 2.29 K.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Ceramics
Xiang Niu, Xiaodong Jian, Xianyi Chen, Haoxuan Li, Wei Liang, Yingbang Yao, Tao Tao, Bo Liang, Sheng-Guo Lu
Summary: Doping manganese ions in (BaSr)TiO3 (BST) ceramics can lead to high permittivity and low dielectric losses, improving the performance of the materials. The Ba0.6Sr0.4Mn0.001Ti0.999O3 sample exhibited a maximum electrocaloric effect of 2.75 K in temperature change at approximately 21 degrees C and 50 kV/cm, making it a promising ECE material for practical refrigeration devices operating at room temperature.
JOURNAL OF ADVANCED CERAMICS
(2021)
Article
Mechanics
Ningbo He, Qiang Li, Chihou Lei, Junyun Pan, Dongliang Shan, Kai Pan, Yunya Liu
Summary: In this study, the electrocaloric (EC) response modulated by misfit strain in different oriented ferroelectric thin films was investigated using a nonlinear thermodynamic approach. The results showed that thin films with different orientations exhibited different phase structures, phase transition temperatures, and EC responses. The EC response was optimal near the phase boundaries of different phases, which was attributed to the large change in polarization. Additionally, the chemical composition and film orientation also influenced the EC response.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Physics, Condensed Matter
Yuying Cao, Xulong Zhang, Long Zhou, Hongfei Liu, Hua Gao, Fu Zheng, Huanming Chen, Zhi Ma
Summary: This paper investigates the phase transitions and flexo-electric effect of Bi4Ti3O12 and finds that the largest temperature change caused by phase transitions occurs at the Curie temperature, with an electrocaloric coefficient of 0.15 K·cm·kV-1. Under a pressure of 6.5 GPa, the Curie temperature can be regulated from 955 K down to 295 K, with a controllable adjustment factor of 102 K/GPa. BIT material exhibits excellent electrocaloric and flexoelectric properties, providing a simple and effective approach for designing high-performance EC materials near room temperature for solid-state refrigeration technology.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Physics, Applied
N. Khakpash, H. Khassaf, G. A. Rossetti, S. P. Alpay
APPLIED PHYSICS LETTERS
(2015)
Article
Physics, Applied
Matias Acosta, Nikola Novak, George A. Rossetti, Juergen Roedel
APPLIED PHYSICS LETTERS
(2015)
Article
Materials Science, Multidisciplinary
Matias Acosta, Nasser Khakpash, Takumi Someya, Nikola Novak, Wook Jo, Hajime Nagata, George A. Rossetti, Juergen Roedel
Article
Physics, Applied
Florian H. Schader, Nasser Khakpash, George A. Rossetti, Kyle G. Webber
JOURNAL OF APPLIED PHYSICS
(2017)
Article
Chemistry, Physical
Rohit Batra, Tran Doan Huan, Jacob L. Jones, George Rossetti, Rampi Ramprasad
JOURNAL OF PHYSICAL CHEMISTRY C
(2017)
Review
Physics, Applied
M. Acosta, N. Novak, V. Rojas, S. Patel, R. Vaish, J. Koruza, G. A. Rossetti, J. Roedel
APPLIED PHYSICS REVIEWS
(2017)
Article
Materials Science, Ceramics
Florian Weyland, Thorsten Eisele, Sebastian Steiner, Till Froemling, George A. Rossetti, Juergen Roedel, Nikola Novak
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2018)
Article
Energy & Fuels
Florian Weyland, Richard Perez-Moyet, George A. Rossetti, Nikola Novak
Article
Materials Science, Multidisciplinary
Dragan Damjanovic, George A. Rossetti
Article
Materials Science, Multidisciplinary
Krishna Chaitanya Pitike, Nasser Khakpash, John Mangeri, George A. Rossetti, Serge M. Nakhmanson
JOURNAL OF MATERIALS SCIENCE
(2019)
Article
Chemistry, Physical
Rohit Batra, Huan Doan Tran, Brienne Johnson, Brandon Zoellner, Paul A. Maggard, Jacob L. Jones, George A. Jr Jr Rossetti, Rampi Ramprasad
CHEMISTRY OF MATERIALS
(2020)
Article
Materials Science, Ceramics
Nikola Novak, Florian Weyland, George A. Rossetti
Summary: The study found that the electrocaloric effect of Ba(ZrxTi1-x)O-3 (BZT) decreases significantly with increasing Zr concentration, but an enhanced electrocaloric responsivity occurs at the triple point composition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Travis Peters, Christopher Cheng, George A. Rossetti, Susan Trolier-McKinstry
Summary: The study investigates the correlation between dielectric and ferroelectric properties of piezoelectric thin films deposited on flexible metal substrates and the coefficient of thermal expansion mismatch and substrate thickness. Different substrates exhibit distinct peak splitting and stress states, influencing the film properties and behavior. The results highlight the importance of stress state on ferroelectric domain mobility and provide dip-coating conditions for high-quality piezoelectric films on various substrates.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Rohit Batra, Tran Doan Huan, George A. Rossetti, Rampi Ramprasad
CHEMISTRY OF MATERIALS
(2017)
Article
Materials Science, Multidisciplinary
Florian H. Schader, George A. Rossetti, Jun Luo, Kyle G. Webber