TY - JOUR
T1 - Phase transition in weberite-type Gd3NbO7
AU - Cai, Lu
AU - Denev, Sava
AU - Gopalan, Venkatraman
AU - Nino, Juan C.
N1 - Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2010/3
Y1 - 2010/3
N2 - Gd3NbO7 has an orthorhombic weberite-type crystal structure and undergoes a phase transition at about 340 K. The phase transition was confirmed by second harmonic generation, heat capacity measurement, and high-resolution X-ray diffraction. Above 340 K, Gd3NbO7 has a centrosymmetric weberite-type structure with space group Cmcm (No. 63) and transforms at about 340 K into a non-centrosymmetric structure with space group Cm2m (No. 38). The phase transition is mainly due to off-center shifts of Nb5+ ions within NbO6 octahedra, as well as off-center shifts of one-third of the Gd3+ ions within GdO8 polyhedra.
AB - Gd3NbO7 has an orthorhombic weberite-type crystal structure and undergoes a phase transition at about 340 K. The phase transition was confirmed by second harmonic generation, heat capacity measurement, and high-resolution X-ray diffraction. Above 340 K, Gd3NbO7 has a centrosymmetric weberite-type structure with space group Cmcm (No. 63) and transforms at about 340 K into a non-centrosymmetric structure with space group Cm2m (No. 38). The phase transition is mainly due to off-center shifts of Nb5+ ions within NbO6 octahedra, as well as off-center shifts of one-third of the Gd3+ ions within GdO8 polyhedra.
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U2 - 10.1111/j.1551-2916.2009.03494.x
DO - 10.1111/j.1551-2916.2009.03494.x
M3 - Article
AN - SCOPUS:77649198075
SN - 0002-7820
VL - 93
SP - 875
EP - 880
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 3
ER -