Oxygen activity dependence of the chromium(IV) population in chromium-doped forsterite crystals grown by the floating zone technique

被引：26

作者：

Mass, JL

Burlitch, JM

Markgraf, SA

Higuchi, M

Dieckmann, R

Barber, DB

Pollock, CR

机构：

[1] CORNELL UNIV, DEPT MAT SCI & ENGN, ITHACA, NY 14853 USA

[2] CORNELL UNIV, DEPT CHEM, BAKER LAB, ITHACA, NY 14853 USA

[3] CORNELL UNIV, SCH ELECT ENGN, ITHACA, NY 14853 USA

来源：

JOURNAL OF CRYSTAL GROWTH | 1996年 / 165卷 / 03期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0022-0248(96)00162-5

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The lasing of Cr-doped forsterite, CrMg2SiO4, at 1.2 mu m has been attributed to the presence of Cr4+. The goal of this work was to determine the Cr4+/Cr3+ ratios Of crystals grown at different oxygen partial pressures and to compare them with a model based on point defect thermodynamics. Cr:forsterite crystals were, grown by the floating zone technique with gas atmospheres of 100% Ar, 99% Ar + 1% O-2, 80% Ar + 20% O-2, 33% Ar + 67% O-2, and 100% O-2 at 1 atm total pressure. The Cr4+/Cr3+ ratios, as well as the distribution of the Cr3+ cations on the M1 and M2 sites, were determined by electron paramagnetic resonance techniques. The fraction of Cr present as Cr4+ ions as a function of the oxygen activity of the growth environment was well described by the model.

引用

页码：250 / 257

页数：8

共 19 条

[1]

Browne E., 1986, Table of Radioactive Isotopes

[2]

Browne E., 1978, Table of Isotopes, Vseventh

[3] 9.6-GHZ AND 34-GHZ ELECTRON-PARAMAGNETIC-RESONANCE STUDIES CHROMIUM-DOPED FORSTERITE [J].