RBaCo2O(5＋δ)陶瓷的氧阻性能研究(英文)  

Investigation on Oxygen Resistance Properties of RBaCo_2O_(5+δ) Ceramics

作　　者：宋红章[1] 秦臻[2] 高峰[1] 贾建峰[1] 杨德林[1] 胡行[1] 

机构地区：[1]郑州大学物理工程学院材料物理教育部重点实验室,郑州450052 [2]华北水利水电学院数学与信息科学学院,郑州450011

出　　处：《无机材料学报》2012年第8期887-890,共4页Journal of Inorganic Materials

基　　金：Natural Science Research Project of Education Committee of Henan Province(2011B430021)

摘　　要：用固相反应法制备了RBaCo2O5+δ(R=Y、Dy、Gd、Pr、Nd、Sm和Eu)系列陶瓷.用标准四探针法测量了它们从室温到600℃之间的电阻率变化.在温度较低时,它们的电阻率都随着温度的升高而减小,显示为半导体特征.当电阻率在某一温度达到最大值后,电阻率开始随着温度升高而缓慢增加,显示为半金属特征.进一步研究了RBaCo2O5+δ系列陶瓷在高温恒温时的电阻率随着环境气氛的变化情况.结果表明RBaCo2O5+δ陶瓷是一类潜在的氧阻传感器材料,并且它们的响应速率从快到慢顺序是YBaCo2O5+δ>DyBaCo2O5+δ>GdBaCo2O5+δ>PrBaCo2O5+δ>NdBaCo2O5+δ>SmBaCo2O5+δ>EuBaCo2O5+δ.以YBaCo2O5+δ陶瓷为例,在700℃恒温时,当从氧气氛切换到氮气氛时,由于晶格中氧的脱附导致电阻率先是快速上升,然后缓慢上升,并在90 s内达到最大平衡值.反之,当从氮气氛切换为氧气氛时,由于氧的吸附,电阻率迅速降低,约30 s内达到最小平衡值.RBaCo 2 O 5＋δ （R=Y, Dy, Gd, Pr, Nd, Sm, and Eu） ceramics were synthesized by the solid-state reaction method. Their resistivities depending on temperature were investigated by the standard four-probe method from room temperature to 600℃. At low temperature, all the resistivities decrease with the rising temperature, and exhibit semiconducting behavior. After the resistivities reach minimum values at certain temperatures, they increase slowly with temperature, and exhibit semimetal conducting behavior. Especially, the resistivity variations of RBaCo 2 O 5＋δ samples with the change of atmosphere at constant temperatures are studied. The results show that RBaCo 2 O 5＋δ could be potential oxygen resistance sensor materials, and that the responding rates of RBaCo 2 O 5＋δ are YBaCo 2 O 5＋δ 〉 DyBaCo 2 O 5＋δ 〉 GdBaCo 2 O 5＋δ 〉 PrBaCo 2 O 5＋δ 〉 NdBaCo 2 O 5＋δ 〉 SmBaCo 2 O 5＋δ 〉 EuBaCo 2 O 5＋δ . For YBaCo 2 O 5＋δ , the resistivity rises quickly due to the oxygen desorption when the atmosphere is switched from oxygen to nitrogen at 700℃, and reaches its maximum equilibrium value within 90 s. In addition, the resistivity drops drastically due to the oxygen adsorption when the nitrogen atmosphere is switched to oxygen, and reaches its minimum equilibrium value within 30 s.

关 键 词：RBaCo2O5+δ陶瓷 环境氧分压 变阻器 传感器 

分 类 号：TQ174.756[化学工程—陶瓷工业]