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Evidence for monoclinic crystal structure and negative thermal expansion below magnetic transition temperature in Pb(Fe1/2Nb1/2)O3

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5 Author(s)
Singh, Satendra Pal ; School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi-221 005, India ; Pandey, Dhananjai ; Yoon, Songhak ; Baik, Sunggi
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The existing controversy about the room temperature structure of multiferroic Pb(Fe1/2Nb1/2)O3 is settled using synchrotron powder x-ray diffraction data. Results of Rietveld refinements in the temperature range of 300–12 K reveal that the structure remains monoclinic in the Cm space group down to 12 K, but the lattice parameters show anomalies at the magnetic transition temperature (TN) due to spin-lattice coupling. The lattice volume exhibits negative thermal expansion behavior, with α=-4.64×10-6K-1, below TN.

Published in:

Applied Physics Letters  (Volume:90 ,  Issue: 24 )

Date of Publication:

Jun 2007

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