Electrical properties of yttrium calcium oxyborate crystal annealed at high temperature and low oxygen partial pressure
作者机构：State Key Laboratory of Crystal MaterialsAdvanced Research Center for Optics of Shandong UniversityJinan250100China ISEMAustralia Institute of Innovative MaterialsUniversity of WollongongWollongongNSW2500Australia
出 版 物：《Journal of Materiomics》 (无机材料学学报（英文）)
年 卷 期：2019年第5卷第3期
页 面：363-371页
核心收录：
学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学]
基 金：financially supported by the Primary Research&Development Plan of Shandong Province(2017CXGC0413) the National Natural Science Foundation of China(51872165)
主 题：YCOB crystal Recoverable dielectric properties First principle calculations
摘 要：The yttrium calcium oxyborate crystal(YCa_(4)O(BO_(3))_(3),YCOB)has been actively studied for hightemperature piezoelectric sensing *** this work,the stability of electric properties of YCOB crystal annealed in critical conditions(high-temperatures of 900-1100℃ with a low oxygen partial pressure of 4×10^(-6) atm for 24 h)was investigated and the recovery mechanism for the electrical resisitivity,dielectric permittivity and dielectric loss were studied,taking advantage of the X-ray photoelectron spectra and the first principle *** electrical resistivity of the annealed YCOB crystal was slightly decreased when compared to the pristine counterpart,being(2-5)×10^(7) Ω·cm at 850*** dielectric permittivity and dielectric loss were found to increase after annealing,showing recoverable behaviours after thermal treatment above 650℃ in *** calculated vacancy formation energy indicates that the oxygen vacancy is the dominant defects in *** formation of oxygen vacancy weakens the chemical bonding strength between B(Ca or Y)and O atoms,introduces extra donor levels in the band gap,which excites the electrons to conduction band more easily thus enhances the electrical conductivity and dielectric *** recovered electrical properties are believed to be associated with the reduced vacancy defects at elevated temperatures in air.
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