Effect of doping pairs (La,Na) on structural and electrical properties of PZT ceramics |
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| Affiliation: | 1. School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan, 411105, PR China;2. Key Laboratory of Low Dimensional Materials and Application Technology, Xiangtan University, Ministry of Education, Xiangtan, Hunan, 411105, PR China;1. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350117, China;2. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;3. Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China;1. Physics Department, IIIT-RKValley, RGUKT, Andhra Pradesh 516330, India;2. Dept. of Physics, Sri Chaitanya High School, Vempalli, Andhra Pradesh 516330, India;3. Dept. of Physics, Shiksha O Anusandhan University, Bhubaneswar, Khandgiri 751030, India;1. Department of Physics, National Institute of Technology Patna, Patna, 800005 Bihar, India;2. Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland;1. Department of Physics and Astrophysics, University of Delhi, New Delhi 110007, India;2. Department of Physics, Gargi College, University of Delhi, Siri Fort Road, New Delhi 110049, India;3. Department of Physics, Atmaram Sanatan Dharma College, University of Delhi, Dhaula Kuan, New Delhi 110021, India |
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| Abstract: | Polycrystalline samples of double-doped PZT with a general formula Pb0.91(La1−z/3Naz)0.0.9 (Zr0.65Ti0.35)0.9775O3 [z = 0.0, 0.1, 0.3, 0.5, 0.7] near the morphotropic phase boundary (MPB) have been synthesized by a solution-mixing technique. X-ray structural analysis of the compound shows that there is no change in the crystal structure of PZT on double doping with La and Na. Detailed analysis of the dielectric constant (ɛ) and dissipation factor (tanδ) at different temperatures (room temperature to 350°C) at 10 kHz and frequencies (0.4 to 10 kHz) shows a very dramatic effect of double doping. The transition temperature shifts towards the higher-temperature side with the increase in Na concentration. The dielectric constant is found to increase initially and then to decrease with increasing Na concentration. A diffuse phase transition is observed in these compositions. D.c. resistivity studies have been carried out from room temperature to 300°C and the results are presented. |
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