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The decrease of depolarization temperature and the improvement of pyroelectric properties by doping Ta in lead-free 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 ceramics
Affiliation:1. Department of Applied Physics, Guru Jambheshwar University of Science & Technology, Hisar, 125001, Haryana, India;2. Department of Physics, MKJK College, Rohtak, 124001, Haryana, India;1. School of Materials, University of Manchester, Manchester M13 9PL, UK;2. Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK;1. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, People''s Republic of China;2. University of the Chinese Academy of Sciences, Beijing 100049, People''s Republic of China;1. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China;2. College of Materials Science and Engineering, China Jiliang University, Hangzhou, 310018, China;3. Functional Materials Research Laboratory, School of Materials Science & Engineering, Tongji University, No. 4800 Caoan Highway, Shanghai, 201804, China;1. Department of Materials Science, Sichuan University, 610064, Chengdu, PR China;2. Sichuan Province Key Laboratory of Information Materials and Devices Application, Chengdu University of Information Technology, Chengdu, PR China;1. Department of Physics, Guru Jambheshwar University of Science & Technology, Hisar-125001, Haryana, India;2. Department of Physics, MKJK College, Rohtak-124001, Haryana, India
Abstract:Ta-doped lead-free 0.94NBT-0.06BT-xTa (x=0.0–1.0%) ceramics were synthesized by a conventional solid-state route. XRD shows that the compositions are at a morphotropic phase boundary where rhombohedral and tetragonal phases coexist. The depolarization temperature (Td) shifted to lower temperature with the increase of Ta content. The pyroelectric coefficient (p) of doped ceramics greatly enhanced compared with undoped material and reached a maximum of 7.14×10?4 C m?2 °C?1 at room temperature (RT) and 146.1×10?4 C m?2 °C?1 at Td at x=0.2%. The figure of merits, Fi and Fv, also showed a great improvement from 1.12×10?10 m v?1 and 0.021 m2 C?1 at x=0.0 to 2.55×10?10 m v?1 and 0.033 m2 C?1 at x=0.2% at RT. Furthermore, Fi and Fv show the huge improvement to 52.2×10?10 m v?1 and 0.48×10?10 m v?1 respectively at Td at x=0.2%. FC shows a value between 2.26 and 2.42 ×10?9 C cm?2 °C?1 at RT at x=0.2%. The improved pyroelectric properties make NBT-0.06BT-0.002Ta ceramics a promising infrared detector material.
Keywords:Lead free ceramics  Lanthanum doping NBT-BT  Morphotropic phase boundary (MPB)  Depolarization temperature  Pyroelectric properties  Figure of merits
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