On the influence of inversion on thermal properties of magnesium gallium spinel

被引：25

作者：

Schwarz, Linda ^{[1
,2
]}

Galazka, Zbigniew ^{[1
]}

Gesing, Thorsten M. ^{[3
,4
]}

Klimm, Detlef ^{[1
]}

机构：

[1] Leibniz Inst Kristallzuchtung, D-12489 Berlin, Germany

[2] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

[3] Univ Bremen, Inst Anorgan Chem & Kristallog, Chem Kristallog Fester Stoffe, FB 2, D-28359 Bremen, Germany

[4] MAPEX Ctr Mat & Proc, D-28359 Bremen, Germany

来源：

CRYSTAL RESEARCH AND TECHNOLOGY | 2015年 / 50卷 / 12期

关键词：

spinel; single crystal; thermal diffusivity; laser flash method; X-ray analysis; CATION DISTRIBUTION; MGAL2O4; SPINEL; TEMPERATURE-DEPENDENCE; DIFFUSIVITY; RESISTANCE; RADII;

D O I：

10.1002/crat.201500275

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Measurements of thermal diffusivity. (using laser flash analysis) for temperatures from 100 degrees C to 1200 degrees C and of the inversion parameter x (using X-ray analysis) for the single crystal spinel MgGa2O4 have been performed. X-ray analysis showed a small change in x for samples annealed at 800 degrees C (x = 0.838) and 1200 degrees C (x = 0.834). Thermal diffusivity revealed a significant rise of kappa for temperatures higher than 950 degrees C, deviating from the typical 1/T drop of kappa. An additional systematic rise of kappa with time is observed for temperatures between 950 degrees C and 1100 degrees C. A connection between cation disordering processes typical for spinels at elevated temperatures and the observed deviation of kappa is proposed: Data indicate that cations changing their occupancy site at equilibration processes contribute significantly to kappa and therefore represent a new type of heat transport.

引用

页码：961 / 966

页数：6

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