Defect Structure and Morphology of Alkali Niobate (Na0.5K0.5)NbO3 Powder Calcined under Low Oxygen Partial Pressure

被引：4

作者：

Kobayashi, Keisuke ^{[1
]}

Shimizu, Hiroyuki ^{[1
,2
]}

Doshida, Yutaka ^{[1
]}

Mizuno, Youichi ^{[1
]}

Randall, Clive A. ^{[2
]}

机构：

[1] Taiyo Yuden Co Ltd, R&D Lab, Mat R&D Dept, Takasaki, Gunma 3703347, Japan

[2] Penn State Univ, Mat Res Inst, Ctr Dielect Studies, University Pk, PA 16802 USA

来源：

APPLIED PHYSICS EXPRESS | 2013年 / 6卷 / 10期

基金：

美国国家科学基金会;

关键词：

PIEZOELECTRIC PROPERTIES; DIELECTRIC-PROPERTIES; OPTICAL-PROPERTIES; CERAMICS; BATIO3; ENERGY; PHASES; NANBO3; KNBO3;

D O I：

10.7567/APEX.6.101502

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effects of oxygen partial pressure (pO(2)) in the calcination process of perovskite ( Na0.5K0.5)NbO3 (NKN) are investigated in terms of morphology and defect structure. Ceramic powders calcined in low-pO(2) atmospheres exhibit cubic-shaped particles with smaller mean diameter. The tail of the absorption edge in UV-visible diffuse reflectance spectra becomes smaller at low-pO(2) atmospheres in the calcination process, implying the suppression of alkali vacancies. The smaller powder size and lower concentration of alkali vacancies in low-pO(2)-calcined powder improves the sinterability, thereby leading to higher resistivity. Therefore, the low-pO(2) calcination is an essential process for NKN-based piezoelectrics. (c) 2013 The Japan Society of Applied Physics

引用

页数：4

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