NONSTOICHIOMETRIC PHASES IN THE TI-W-O SYSTEM

被引：4

作者：

EKSTROM, T ^{[1
]}

TILLEY, RJD ^{[1
]}

WATTS, KA ^{[1
]}

机构：

[1] UNIV WALES COLL CARDIFF,SCH ENGN,DIV MAT ENGN,CARDIFF CF2 1XH,WALES

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1990年 / 87卷 / 02期

关键词：

D O I：

10.1016/0022-4596(90)90034-U

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The phases occurring in the TiWO system close to WO3 at 1273 and 1373 K were determined using X-ray diffraction and electron microscopy. In samples heated for up to 2 weeks an extended phase field of {001} crystallographic shear structures was found to exist between MO2.88 and MO2.93 along the TixWO3 line. These CS structures intergrew with {103} CS structures in the composition region between TixWO3 and the binary WO line to form an operationally nonstoichiometric CS phase region. A disordered structure related to W12O34 with an extended homogeneity range was found for compositions TixW1-xO2.83 with 0 < x < 0.04. This phase was surrounded by a composition region in which disordered PC units were dispersed in the WO3-like matrix to form another nonstoichiometric phase region. Intergrowth between these PC structures and both CS phases and W18O49 were encountered. Heating for up to 2 months caused the ternary {001} CS and (TixW1-x)12O34 phases to slowly decompose and their apparent phase ranges to narrow. © 1990.

引用

页码：321 / 330

页数：10

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