Signature of lattice defects in far infrared reflectivity of Ba(Mg1/3Ta2/3)O3 |
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| Affiliation: | 1. Magnetic Materials Research Laboratory, NEOMAX Co. Ltd., 2-15-17 Egawa, Shimamoto, Osaka 618-0013, Japan;2. Department of Physics, National Taiwan Normal University, 88 Ting-Chou Road, Sec. 4, Taipei, Taiwan, ROC;3. ICYS, National Institute for Material Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;1. Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences, 91, Pervomaiskaya Str., Ekaterinburg, Russia;2. Ural Federal University, 19, Mira Str., Ekaterinburg, Russia;1. College of Electronic Information and Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;2. Laboratory of Dielectric Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;2. School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore;3. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 637371, Singapore;4. Medical Institute Department, Sichuan College of Traditional Chinese Medicine, Mianyang 621000, China;1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. Key Lab of Functional Materials for Electronic Information (B), Ministry of Education, Wuhan 430074, PR China |
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| Abstract: | Far infrared reflectivity spectra of Ba(Mg1/3,Ta2/3)O3 prepared at several sintering temperatures were measured, and the eigenfrequencies and damping constants of the TO modes were determined. The reflectivity spectra were fitted with the four-parameter semi-quantum model. The variation in the Eu(OII) at 222 cm−1 and A2u(OII) at 238 cm−1 modes in well ordered ceramics was attributed to the variation in the concentration of the B site defects. It was also found that the change in the oxygen partial pressure of the sintering atmosphere causes a change in the seventh (316 cm−1) and eighth (352 cm−1) modes. We attribute these changes to the oxygen site defect although we cannot evaluate the concentration of this defect at this moment. From the behavior of the damping constants it is suggested that the Ba(Mg1/3Ta2/3)O3 (BMT) attains equilibrium defect density at the heat treatment temperature of more than 1630 °C (120 h). |
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