Phase transition and high dielectric constant of bulk dense nanograin barium titanate ceramics

被引：81

作者：

Wang, Xiaohui ^{[1
]}

Deng, Xiangyun ^{[1
]}

Wen, Hai ^{[1
]}

Li, Longtu ^{[1
]}

机构：

[1] Tsinghua Univ, State Key Lab New Ceram & Fine Proc, Dept Mat Sci & Engn, Beijing 100084, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 16期

关键词：

GRAIN-SIZE; BATIO3; MODES; RAMAN;

D O I：

10.1063/1.2363930

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Barium titanate (BTO) ceramics with an average grain size of 8 nm were fabricated and studied. The temperature dependent Raman spectra revealed successive transitions from rhombohedral to orthorhombic, tetragonal, and cubic as the temperature increased from 87 to 673 K. Local piezoresponse force measurements indicated that the ceramics had switchable polarization at room temperature. Dielectric measurements showed a broad ferroelectric-to-paraelectric phase transition with a maximum permittivity of 1800 at 390 K. All these results suggest that ferroelectricity could remain in BTO ceramics with grain size as small as 8 nm in diameter.

引用

页数：3

共 22 条

[1] DIELECTRIC-PROPERTIES OF FINE-GRAINED BARIUM-TITANATE CERAMICS [J].