PRECIPITATION OF COPPER AND CHROMIUM IMPURITIES IN LANTHANUM MAGNESIUM ALUMINATE CRYSTALS DURING THERMOCHEMICAL REDUCTION

被引：7

作者：

BALLESTEROS, C

GONZALEZ, R

CHEN, Y

KOKTA, MR

机构：

[1] UNIV CARLOS III,ESCUELA POLITECN SUPER,DEPT INGN,E-28913 LEGANES,SPAIN

[2] OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831

[3] UNION CARBIDE CORP,WASHOUGAL,WA 98671

[4] US DOE,DIV MAT SCI,WASHINGTON,DC 20585

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.47.2460

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thermochemical reduction at high temperatures has been performed on chromium-doped lanthanum magnesium aluminate crystals. Analytical transmission-electron-microscopy and optical-absorption techniques were used to characterize the crystals. Copper impurities inherently present in the crystals began to aggregate and form Cu-rich particles at 1500 K near the surface region. Below 1870 K there was no evidence of chromium precipitates being formed. However, Cr-rich particles were formed at 2020 K. The distribution of the precipitates was very inhomogeneous and the precipitates were also concentrated near the surface region.

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页码：2460 / 2464

页数：5

相关论文

共 19 条

[1] ELECTROLYTIC COLORATION AND ELECTRICAL BREAKDOWN OF MGO SINGLE-CRYSTALS [J].

ABRAHAM, MM ;

BOATNER, LA ;

CHRISTIE, WH ;

MODINE, FA ;

NEGAS, T ;

BUNCH, RM ;

UNRUH, WP .

JOURNAL OF SOLID STATE CHEMISTRY, 1984, 51 (01) :1-16

[2]

BAGDASAROV KS, 1983, KVANTOVAYA ELEKTRON+, V10, P1014

[3] OPTICAL AND ANALYTICAL TRANSMISSION ELECTRON-MICROSCOPY CHARACTERIZATION OF THERMOCHEMICALLY REDUCED MGAL2O4 SPINEL [J].

BALLESTEROS, C ;

CAIN, LS ;

PENNYCOOK, SJ ;

GONZALEZ, R ;

CHEN, Y .

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1989, 59 (04) :907-916

[4] OPTICAL AND ANALYTICAL TRANSMISSION-ELECTRON-MICROSCOPY STUDIES OF THERMOCHEMICALLY REDUCED MGO CRYSTALS [J].

BALLESTEROS, C ;

GONZALEZ, R ;

PENNYCOOK, SJ ;

CHEN, Y .

PHYSICAL REVIEW B, 1988, 38 (06) :4231-4238

[5] OPTICAL AND TRANSMISSION-ELECTRON-MICROSCOPY CHARACTERIZATION OF METAL PRECIPITATES IN DOPED THERMOCHEMICALLY REDUCED MAGNESIUM-OXIDE [J].

BALLESTEROS, C ;

GONZALEZ, R ;

CHEN, Y .

PHYSICAL REVIEW B, 1988, 37 (14) :8008-8014

[6]

BALLESTEROS C, UNPUB

[7] LIGHT-SCATTERING MEASUREMENTS OF DIFFUSIONAL GROWTH OF PRECIPITATES IN NICKEL-DOPED AND COBALT-DOPED MGO [J].

BUNCH, RM ;

UNRUH, WP ;

IVERSON, MV .

JOURNAL OF APPLIED PHYSICS, 1985, 58 (04) :1474-1482

[8] IONIZING-RADIATION EFFECTS IN LANTHANUM MAGNESIUM ALUMINATE CRYSTALS [J].

CHEN, CY ;

PARK, JL ;

CAIN, LS ;

POGATSHNIK, GJ ;

KOKTA, MR ;

ABRAHAM, MM ;

CHEN, Y .

PHYSICAL REVIEW B, 1989, 40 (12) :8522-8529

[9] LUMINESCENCE OF F+ CENTER IN MGO [J].

CHEN, Y ;

KOLOPUS, JL ;

SIBLEY, WA .

PHYSICAL REVIEW, 1969, 186 (03) :865-&

[10] CHARGE AND MASS-TRANSFER INVOLVING HYDROGEN IN MGO CRYSTALS THERMOCHEMICALLY REDUCED AT HIGH-TEMPERATURES [J].

CHEN, Y ;

GONZALEZ, R ;

SCHOW, OE ;

SUMMERS, GP .

PHYSICAL REVIEW B, 1983, 27 (02) :1276-1282