DETERMINATION OF THE C/A RATIO OF A SUBMICROMETER-SIZED CRYSTAL OF TETRAGONAL BARIUM-TITANATE BY THE SYNCHROTRON-RADIATION

被引：0

作者：

KATAOKA, M

SUDA, K

ISHIZAWA, N

MARUMO, F

SHIMIZUGAWA, Y

OHSUMI, K

机构：

[1] NIHON UNIV,DEPT EARTH SCI,SETAGAYA KU,TOKYO 156,JAPAN

[2] NATL INST RES INORGAN MAT,TSUKUBA,JAPAN

[3] NATL LAB HIGH ENERGY PHYS,OHO,IBARAKI 305,JAPAN

来源：

NIPPON SERAMIKKUSU KYOKAI GAKUJUTSU RONBUNSHI-JOURNAL OF THE CERAMIC SOCIETY OF JAPAN | 1994年 / 102卷 / 02期

关键词：

BARIUM TITANATE; FERROELECTRIC; PHASE TRANSITION; SIZE EFFECT; C/A RATIO; TETRAGONALITY; SYNCHROTRON; MICROCRYSTAL DIFFRACTION; LAUE METHOD;

D O I：

暂无

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The tetragonality of submicrometer-sized crystals of barium titanate, BaTiO3, has been investigated by the ultramicro single-crystal X-ray diffraction technique using synchrotron radiation. The c/a ratios have been determined using the splitting of Laue spots due to twinning to be 1.0072(2) and 1.0106(6) for crystals with conversion diameters of 0.56 mum and 10 mum, respectively. The c/a ratio of the 10 mum crystal is approximately the same as that of the bulk crystal, while it is significantly small for the 0.56 mum crystal, indicating that the size effect on the tetragonal-to-cubic phase transition is remarkable in the submicrometer region. No clear splitting due to tetragonal twinning was observed for the crystal with a conversion diameter of 0.25 mum, suggesting that the critical size for the transition is close to this size.

引用

页码：213 / 216

页数：4