J. Phys. IV France 07 (1997) C1-369-C1-370
A Study of Phase Transitions in Sr2FeVO6-δ by X-Ray DiffractionA. Maryanowska and J. Pietrzak
Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznah, Poland
The thermal expansion of Sr2FeVO5.6 (SFVO) has been measured in the temperature interval 20-300K by the powder X-ray diffraction technique to elucidate the relationship between the crystal symmetry and its magnetic behaviour.The thermal expansion coefficients αa, αb and αc revealed a sudden decrease at 80 K and 240 K, although the crystal symmetry of the compound remained unchanged Moreover, for 100 K<T<240 K as well as T>270 K, a high anisotropy of the thermal expansion was obsewed. This effect is expected to be related to changes in the magnetic ordering of the compound studied [I].
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