POLYMORPHISM OF NDTAO4

Authors
TITOV YA SYCH AM SOKOLOV AN KAPSHUK AA YASHCHUK VP
Citation
Ya. Titov et al., POLYMORPHISM OF NDTAO4, Inorganic materials, 33(1), 1997, pp. 60-63
Citations number
12
Categorie Soggetti
Material Science
Journal title
Inorganic materials → ACNP
ISSN journal
00201685
Volume
33
Issue
1
Year of publication
1997
Pages
60 - 63
Database
ISI
SICI code
0020-1685(1997)33:1<60:PON>2.0.ZU;2-0
Abstract
A new polymorphic form of NdTaO4 with a monoclinic LaTaO4-type structu re (a = 0.7572(2) nm, b = 0.5445(3) nm, c = 0.7675(4) nm, beta = 100.0 2(7)degrees; sp. gr. P2(1)/c, Z = 4; rho(x) = 8.29 g/cm(3), rho(meas) = 8.20 g/cm(3)) was obtained at high pressures and temperatures (8 x 1 0(9) Pa, 1773 K). The reverse transformation from high-pressure NdTaO4 to the M-fergusonite phase occurs at ambient pressure at temperatures above 1270 K and is close to a second-order transition.