Non-180° domains formation mechanism in LiTaO₃ grains of an Al₂O₃/LiTaO₃ composite

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• 作者：Youfeng Zhang ; Yu Zhou ; Dechang Jia ; Qingchang Meng ; Yangai Liu ; Hua Ke
• 关键词：A. Hot pressing ; B. Composites ; B. Electron microscopy ; D. Al₂O₃ ; LiTaO₃
• 刊名：Ceramics International
• 出版年：2009
• 出版时间：April 2009
• 年：2009
• 卷：35
• 期：3
• 页码：949-952
• 全文大小：752 K

文摘

High density (>99.5 % ) Al₂O₃/LiTaO₃ (ALT) composite was obtained by hot pressing at 1300 °C/25 MPa in nitrogen atmosphere. The microstructure, which included a domain structure in LiTaO₃ grains, was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Most of the domains observed in LiTaO₃ grains of the Al₂O₃/LiTaO₃ (ALT) composites belong to a non-180° type domain, which cannot exist in LiTaO₃ single crystals. This non-symmetry domain microstructure belongs to ferroelectric twinning with twin composition plane. The non-180° domains formation mechanism was proposed.