Preparation,characterization and dielectric properties of Ba5LnZnTa9O30 (Ln=La,Sm) ceramics |
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| Affiliation: | 1. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, PR China;2. New Materials R&D Center, Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, Sichuan, PR China;3. Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, Hunan University, Changsha 410000, Hunan, PR China;1. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China;2. Faculty of Science, Jiangsu University, Zhenjiang 212013, China;1. State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou, 310027, China;2. Innovation Institute for Artificial Intelligence in Medicine, Zhejiang University, Hangzhou, 310018, China;3. Department of Chemistry, Molecular Science Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London, W12 0BZ, UK |
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| Abstract: | Ba5LnZnTa9O30 (Ln=La, Sm) ceramics were prepared by high temperature solid-state reaction route. The samples were characterized by X-ray diffraction, scanning electron microscopy (SEM), and differential scanning calorimetry (DSC) methods. They belong to paraelectric phase of filled tetragonal TB structure at room temperature with unit cell a=12.5909(4) Å, c=3.9622(2) Å for Ba5LaZnTa9O30; and a=12.5777(4) Å, c=3.9544(2) Å for Ba5SmZnTa9O30. At 1 MHz, Ba5LaZnTa9O30 has high dielectric constants of 89 with low dielectric loss 0.0067, and temperature coefficients of the dielectric constant (τε) −811 ppm °C−1; Ba5LaZnTa9O30 has dielectric constants of 74 with low dielectric loss 0.0035, and τε −474 ppm °C−1. |
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