Preparation of Nd2Ti3O8.7 Dielectric Ceramics by Chemical Solution Methods and Mixed-Oxide with Calcium

化學溶液法及氧化物混合法加鈣製備Nd2Ti3O8.7介電陶瓷

王宏文(H. W Wang) ； 陳鼎文(T. W. Cheng) ； 詹佩誼(P. S. Chan)

《材料科學與工程》 33卷3期 (2001/09) Pp. 189-193

https://doi.org/10.6409/JMSE.200109.0189

摘要

利用EDTA-膠化法，共沉法，及氧化物混合法製備Nd2Ti3O8.7粉末。用X光繞射鑑定熱分解及燒結後的結晶相。單一Nd2Ti3O8.7的相即使使用化學成分均勻度很好的EDTA-膠化法及共沉法仍難得到。然而，在氧化物混合法中添加鈣產生氧空缺，卻有明顯助於Nd2Ti3O8.7相的生成。從本研究的結果得知，影響Nd2Ti3O8.7相之生成，不是粉末的均勻度而是系統中的氧空缺。

關鍵字

EDTA-膠化法 ； 共沉法 ； 及氧化物混合法 ； 均勻度 ； Nd2Ti3O8.7 ； 氧空缺

並列摘要

Reactive powders of stoichiometry Nd2Ti3O8.7 have been prepared by the EDTA-gel method, co-precipitation method and mixed-oxide method. The corresponded phases after thermal decomposition and sintering were investigated by XRD diffraction. Single phase of Nd2Ti3O8.7 could not be easily obtained by even very homogenous chemical solution methods. However, the substitution of Nd by Ca produces oxygen vacancies can readily promote the formation of Nd2Ti3O8.7 phase. The present study demonstrated that the factor facilitating the formation of Nd2Ti3O8.7 is not the homogeneity of compositions but the existence of oxygen vacancies in the system.

並列關鍵字

EDTA-gel ； Co-precipitation ； Mixed-oxide ； Homogeneity ； Nd2Ti3O8.7 ； Oxygen vacancies