Magnetic properties of ordered perovskites Ba(2)LnTaO(6) (Ln = Y, lanthanides)

Authors
Citation
Y. Doi et Y. Hinatsu, Magnetic properties of ordered perovskites Ba(2)LnTaO(6) (Ln = Y, lanthanides), J PHYS-COND, 13(19), 2001, pp. 4191-4202
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS-CONDENSED MATTER
ISSN journal
0953-8984 → ACNP
Volume
13
Issue
19
Year of publication
2001
Pages
4191 - 4202
Database
ISI
SICI code
0953-8984(20010514)13:19<4191:MPOOPB>2.0.ZU;2-9
Abstract
Magnetic properties of the quaternary oxides Ba(2)LnTaO(6) (Ln = Y or lanth anides) are reported. Their powder x-ray diffraction measurements and Rietv eld analysis show that they have an ordered perovskite structure and are mo noclinic (Ln = La-Tb) with space group P2(1)/n or cubic (Ln = Y, Dy-Lu) wit h space group Fm3m. Magnetic susceptibilities of Ba(2)LnTaO(6) were measure d. All compounds in this work are paramagnetic down to 5 K. Ba2EuTaO6 and B a2SmTaO6 show Van Vleck paramagnetism; their spin-orbit coupling constants are determined to be 331 cm(-1) and 287 cm(-1), respectively. Eu-151 Mossba uer measurements for Ba2EuTaO6 were carried out at 12, 100, 200 and 300 K. The Eu ion is in the trivalent state, and the symmetry of the Eu site is di storted from the octahedral symmetry. The Debye temperature of Eu3+ was det ermined to be 335 K from the temperature dependence of the absorption area of intensity curves.