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SrBi(TaV)O陶瓷的晶体结构与弛豫特性之间的关系

Relationship between Crystal Structures and the Relaxor Property of SrBi(Ta V )O Ceramics.

作者信息

Wu Chia-Ching, Yang Cheng-Fu

机构信息

Department of Applied Science, National Taitung University, Taitung, Taiwan 95092, ROC.

Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung, Taiwan 95092, ROC.

出版信息

ACS Omega. 2019 Oct 7;4(17):17125-17133. doi: 10.1021/acsomega.9b01398. eCollection 2019 Oct 22.

DOI:10.1021/acsomega.9b01398
PMID:31656885
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6811852/
Abstract

Here, VO was used to substitute TaO in SrBiTaO (SBT) and SrBi(Ta V )O (SBTV) ceramics were formed. This study revealed that the substitution of TaO by VO enhances the maximum dielectric constant (ε), increases the transition temperature, and reduces the sintering temperature of SBT ceramics. The diffraction intensity of -axis-preferred orientation of SBTV ceramics increases with the increase in VO concentration and sintering temperature. Disk-type grains were observed in the SBTV ceramics at higher sintering temperatures. By the Curie-Weiss law and modified Curie-Weiss law, the phase transitions of the SBTV ceramics were discussed. The dielectric properties of SBTV ceramics revealed that the relaxor-type ferroelectric characteristics became more obvious than the normal-type ferroelectric characteristics at high VO concentrations and sintering temperatures. Raman spectroscopy was successfully used to study the lattice vibrational modes and structural transitions of SBTV ceramics. The spectra proved that as VO was added to SBTV ceramics the octahedral TaO and VO structures exhibited a high frequency mode.

摘要

在此，采用VO替代SrBiTaO（SBT）中的TaO，形成了SrBi(TaV)O（SBTV）陶瓷。本研究表明，用VO替代TaO可提高SBT陶瓷的最大介电常数（ε），提高转变温度，并降低烧结温度。SBTV陶瓷的c轴择优取向的衍射强度随VO浓度和烧结温度的增加而增加。在较高烧结温度下，SBTV陶瓷中观察到盘状晶粒。通过居里 - 外斯定律和修正的居里 - 外斯定律，讨论了SBTV陶瓷的相变。SBTV陶瓷的介电性能表明，在高VO浓度和烧结温度下，弛豫型铁电特性比正常型铁电特性更为明显。拉曼光谱成功用于研究SBTV陶瓷的晶格振动模式和结构转变。光谱证明，随着VO添加到SBTV陶瓷中，八面体TaO和VO结构呈现高频模式。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6970/6811852/11a07f5baecb/ao9b01398_0011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6970/6811852/12e34a17f208/ao9b01398_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6970/6811852/35b007f87dfc/ao9b01398_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6970/6811852/7c7a1da5eb59/ao9b01398_0007.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6970/6811852/11a07f5baecb/ao9b01398_0011.jpg

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