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Novel spin-dimer system of a microporous polyborate NaCuB7O12.nH2O

Published online by Cambridge University Press:  26 February 2011

Jing Ju ,
Juns Sasaki ,
Naoki Toyota  and
Katsumi Tanigaki
Jing Ju
Affiliation:
[email protected], Tohoku University, Department of Physics, 6-3,Aramaki Aza-Aoba,Aoba-ku,Sendai 980-8578,, Graduate School of Science,Tohoku University,Japan, Sendai, 9808578, Japan, 81-22-795-6468, 81-22-795-6470
Juns Sasaki
Affiliation:
[email protected], Tohoku University, Sendai, 9808578, Japan
Naoki Toyota
Affiliation:
[email protected], Tohoku University, Sendai, 9808578, Japan
Katsumi Tanigaki
Affiliation:
[email protected], Tohoku University, Sendai, 9808578, Japan
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Abstract

A new microporous polyborate, NaCuB7O12.nH2O, is synthesized using boric acid as a flux. It contains a 14-membered ring framework built up by CuO6 octahedra, BO4 tetrahedra and BO3 triangles. The spin-1/2 dimers of Cu2+ ions are connected by BO3 to form an infinite ladder along the b-axis. Magnetic susceptibility data between 2 and 330 K are presented, and the data are accurately fitted by theoretical predictions of Bleaney-Bowers for the spin-1/2 dimer, with J/kB = -153.8 K, and g = 1.98, where J is the intradimer exchange interaction constant and g is the Landé g factor.

Keywords

porositymagnetic propertiesion-exchange material
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1032: Symposium I – Nanoscale Magnetic Materials and Applications , 2007 , 1032-I10-06
Copyright
Copyright © Materials Research Society 2008

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