Influence of attrition milling on the electrical properties of undoped-BaTiO3
Influence of attrition milling on the electrical properties of undoped-BaTiO3
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DOI：
10.1016/j.jeurceramsoc.2006.10.013
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发表时间：
2007-01-01
影响因子：
5.7
通讯作者：
Sinclair, D. C.
中科院分区：
文献类型：
--
作者：
Thakur, O. P.;Feteira, A.;Sinclair, D. C.
从混合氧化物路线（Oh样品）制备的未掺杂的BaTiO 3粉末已使用氧化钇稳定的ZrO 2研磨介质研磨研磨0.5-3小时，然后形成致密的陶瓷。已经观察到等价（Zr 4 + -> Ti 4+）和异价（y（3+）-> Ba 2+）掺杂剂污染效应。系统的变化发生在晶格参数，多晶型相转变温度和介电性能低于居里温度为0-2小时研磨粉，这些主要是由于与Zr掺杂的Ti-网站由于研磨介质污染的离子尺寸效应。与0 h样品相比，在高温下磨碎的样品的体电导率降低了类似2-3个数量级，并且与体电导相关的活化能从0和0.5 h样品的类似1 eV增加到3 h样品的1.4 eV。研磨样品的体电导率和导电机制的变化归因于来自研磨介质的异价Y 3+掺杂剂污染。(c)2006年由Elsevier Ltd.出版
Undoped-BaTiO3 powder prepared from the mixed oxide route (Oh sample) has been attrition milled using yttria-stabilized ZrO2 milling media for 0.5-3 h prior to formation of dense ceramics. Both isovalent (Zr4+ -> Ti4+) and aliovalent (y(3+) -> Ba2+) dopant contamination effects have been observed. Systematic changes occur in the lattice parameters, polymorphic phase transition temperatures and dielectric properties below the Curie temperature for 0-2 h attrition milled powders and these are attributed primarily to an ion-size effect associated with Zr-doping on the Ti-site due to milling media contamination. The bulk conductivity of attrition milled samples at high temperature decreases by similar to 2-3 orders of magnitude compared to 0 h samples and the activation energy associated with bulk conduction increases from similar to 1 eV for 0 and 0.5 h samples to 1.4 eV for 3 h samples. The change in bulk conductivity and conduction mechanism for the attrition milled samples is attributed to aliovalent Y3+ dopant contamination from the milling media. (c) 2006 Published by Elsevier Ltd.