Low-temperature synthesis of beta-aluminas by a sol-gel technique

被引：41

作者：

Jayaraman, V ^{[1
]}

Gnanasekaran, T ^{[1
]}

Periaswami, G ^{[1
]}

机构：

[1] INDIRA GANDHI CTR ATOM RES,MAT CHEM DIV,KALPAKKAM 603102,TAMIL NADU,INDIA

来源：

MATERIALS LETTERS | 1997年 / 30卷 / 2-3期

关键词：

alkoxides; sol-gel; beta-alumina; gamma-alumina; thermal analysis; IR spectra; X-ray diffraction;

D O I：

10.1016/S0167-577X(96)00193-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

New intermediates observed in the process of preparing sodium beta-aluminas by a sol-gel method using metal alkoxides as precursors are described. Results of studies to optimise the conditions for the preparation by changing parameters such as calcination temperatures and initial concentration of isopropoxides are reported. Based on IR, TG/DTA and XRD studies, different steps in the process leading to the formation of beta-aluminas are discussed. These studies show that the formation of beta-alumina starts at as low a temperature as 1273 K possibly through a modified cubic-close-packed gamma-alumina structure stuffed with sodium ions and completes at 1473 K.

引用

页码：157 / 162

页数：6

共 10 条

[1]

Chandry V., 1978, MATER SCI RES, V11, P443

[2] LOW-TEMPERATURE PREPARATION OF BETA-ALUMINA BY AN ALKOXIDE ROUTE [J].

DONGARE, MK ;

SINHA, APB .

BULLETIN OF MATERIALS SCIENCE, 1988, 11 (04) :281-286

[3]

GREEN DJ, 1980, MAT SCI MONOG, V6, P964

[4]

JOHNSON DW, 1979, AM CERAM SOC BULL, V58, P849

[5]

Kummer J., 1972, Prog. Solid State Chem, V7, P141

[6] THE RELATIVE STABILITY OF SPRAY-FROZEN FREEZE-DRIED BETA''-AL2O3 POWDERS [J].

PEKARSKY, A ;

NICHOLSON, PS .

MATERIALS RESEARCH BULLETIN, 1980, 15 (10) :1517-1524

[7]

Sudworth J., 1985, Sodium Sulphur Battery

[8] THE SYNTHESIS OF BETA ALUMINA FROM ALUMINUM HYDROXIDE AND OXYHYDROXIDE PRECURSORS [J].

VANZYL, A ;

THACKERAY, MM ;

DUNCAN, GK ;

KINGON, AI ;

HECKROODT, RO .

MATERIALS RESEARCH BULLETIN, 1993, 28 (02) :145-157

[9]

Vogel A. I., 1971, TXB PRACTICAL ORGANI

[10] FORMATION AND CRYSTALLIZATION OF BETA-ALUMINA FROM PRECURSOR PREPARED BY SOL-GEL METHOD USING METAL ALKOXIDES [J].

YAMAGUCHI, S ;

TERABE, K ;

IGUCHI, Y ;

IMAI, A .

SOLID STATE IONICS, 1987, 25 (2-3) :171-176

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