Excess lead in the perovskite lattice of pzt thin films made by in-situ reactive sputtering
Excess lead in the perovskite lattice of pzt thin films made by in-situ reactive sputtering
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原位反应溅射制备的 PZT 薄膜钙钛矿晶格中铅过量
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
N. Setter
中科院分区：
文献类型：
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作者：
P. Muralt;S. Hiboux;C. Mueller;T. Maeder;L. Sagalowicz;T. Egami;N. Setter
摘要研究了Pb(Zr,Ti)O3 （PZT）钙钛矿晶格中高达40%过量铅的掺入。三种独立的化学成分分析方法证实了铅过量的正确测定，以Pb2O3的形式存在。高分辨率透射电镜排除了任何第二相，并限制了钙钛矿晶格中铅过量的发生，表明铅氧化物钙钛矿的形式为Pb2+Pb4+O3， b位上有一个4价离子。因此，含有过量铅的PZT是PbZrO3、PbTiO3和PbPbO3的固溶体。测量到的由于平均b离子增大而导致的晶格体积增大与基于标准离子半径和b离子半径与PZT晶体单位胞尺寸的依赖关系的计算行为非常吻合。由同步加速器x射线衍射测定的结构因子与b位引线模型的相容性比与标准PZT离子晶格的相容性好得多。
Abstract The incorporation of up to 40 % lead excess into the perovskite lattice of Pb(Zr,Ti)O3 (PZT) has been investigated. Three independent chemical composition analysis methods confirmed the correct determination of the lead excess, present as Pb2O3. High resolution TEM excludes any second phases and restricts the occurrence of lead excess to the perovskite lattice, suggesting a lead oxide perovskite of the form Pb2+Pb4+O3 with a 4-valent ion on the B-site. PZT containing such lead excess is thus a solid solution of PbZrO3, PbTiO3 and PbPbO3. The measured volume increase of the lattice due to a larger average B-ion matches very well with the calculated behavior based on standard ion radii and the B-ion radius dependence of the unit cell dimensions of PZT crystals. Structure factors as determined from Synchrotron X-ray diffraction are much better compatible with the B-site lead model than with the standard PZT ion lattice.