Production and properties of In and Ir doped Bi_1.5Zn_0.92Nb_1.5O_6.92 pyrochlores

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• 作者：Ayhan Mergen^a ; ^{ayhan.mergen@marmara.edu.tr} ; Oğ ; uz &#214 ; zyoldaş ; ^a ; İ ; srafil Kü ; ç ; ü ; k^b
• 关键词：BZN pyrochlore ; Doping ; Dielectric properties ; XRD
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：July, 2012
• 卷：32
• 期：9
• 页码：2019-2023
• 文件大小：608 K

摘要

In and Ir were doped into Bi_1.5Zn_0.92Nb_1.5O_6.92 (BZN) pyrochlore using the chemical formulas of Bi_1.5Zn_0.92鈭?x/2In_xNb_1.5O_6.92 and Bi_1.5Zn_0.92Nb_1.5鈭?x/5Ir_xO_6.92. While In was doped into Zn site of BZN, Ir was added into the Nb site. The solubility limits of In and Ir cations in BZN were x = 0.1 and x = 0.12-0.15, respectively. Above the solubility limits second phases of BiNbO₄ and InNbO₄ formed for In doping but Bi₂Ir₂O₇ and ZnO phases appeared in Ir doping. SEM investigation confirmed the XRD results. Lattice parameters of BZN pyrochlores slightly increased with In doping but decreased with Ir due to their ionic radii. The dielectric constant of Ir doped BZN slightly decreased with Ir content. However, In doping into the BZN generally decreased the dielectric constant at low doping ratios but increased it at high dopings. Temperature coefficients of Ir and In doped BZN ceramics were significantly affected by doping amount.