OH-groups in natural perovskite - An IR spectroscopic study

被引：4

作者：

Beran, A ^{[1
]}

Libowitzky, E ^{[1
]}

机构：

[1] UNIV BERN,LAB CHEM & MINERAL KRISTALLOG,CH-3012 BERN,SWITZERLAND

来源：

PHASE TRANSITIONS | 1996年 / 58卷 / 1-3期

关键词：

perovskite; trace hydroxyl; microFTIR-spectroscopy;

D O I：

10.1080/01411599608242405

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

IR spectra of a natural CaTiO3 perovskite single-crystal show two absorption bands at 3394 and 3326 cm(-1) which are attributed to structural OH defects. The two bands are weakly pleochroic in a (001) section, but show a more distinct anisotropic behaviour in (110) with a stronger component of absorption perpendicular to [001]. A plausible model for the mode of OH incorporation on a preferred atomic position is derivable under the assumption of vacancies in the Ca-lattice. An OH dipole direction roughly pointing along [110] with O2 oxygens acting as donor oxygens is consistent with the measured pleochroic scheme of the bands.

引用

页码：211 / 215

页数：5