Growth and morphology of W18O49 crystals produced by microwave decomposition of ammonium paratungstate

被引：49

作者：

Pfeifer, J ^{[1
]}

Badaljan, E ^{[1
]}

TekulaBuxbaum, P ^{[1
]}

Kovacs, T ^{[1
]}

Geszti, O ^{[1
]}

Toth, AL ^{[1
]}

Lunk, HJ ^{[1
]}

机构：

[1] OSRAM SYLVANIA INC,TOWANDA,PA 18848

来源：

JOURNAL OF CRYSTAL GROWTH | 1996年 / 169卷 / 04期

基金：

匈牙利科学研究基金会;

关键词：

D O I：

10.1016/S0022-0248(96)00669-0

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

By microwave irradiation of ammonium paratungstate (APT, (NH4)(10)H2W12O42. 4H(2)O), needle crystals of W18O49 with a wide variety of size and morphology were formed. Their sizes and morphologies varied depending on various facets of individual APT pseudomorphous particles on which whiskers were grown, and among neighbouring decomposed APT pseudomorphous particles. Based on scanning electron and transmission electron-microscopic observations, it has been concluded that individual whiskers were monocrystalline and grew by a root growth mechanism from a nucleus formed in the amorphous layer, and that a rapid leader-like whisker growth in length was followed by a subsequent slower growth in thickness. Any evidence supporting a screw dislocation mechanism or tip growth by vapour-liquid-solid have not been detected.

引用

页码：727 / 733

页数：7

共 33 条

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