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Displacive Phase Transformation in Vanadium - Substituted Lanthanum Niobate*

Published online by Cambridge University Press:  21 February 2011

A. T. Aldred ,
S.-K. Chan ,
M. H. Grimsditch  and
M. V. Nevitt
A. T. Aldred
Affiliation:
Materials Science and Technology Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, U.S.A.
S.-K. Chan
Affiliation:
Materials Science and Technology Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, U.S.A.
M. H. Grimsditch
Affiliation:
Materials Science and Technology Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, U.S.A.
M. V. Nevitt
Affiliation:
Materials Science and Technology Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, U.S.A.
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Abstract

The displacive transformations in complex oxides of the type LaNb1-xVxO4 has been studied by x-ray diffraction and Raman scattering for 0 < x < 0.3. X-ray diffraction results indicate that the transformation from the tetragonal high temperature structure (C4h6) to the monoclinic low-temperature structure (C2h6) is higher than first order and that the transformation temperature Tc is depressed significantly by V substitution. Raman scattering results show that the force constant between the nearest (Nb, V)O4 tetrahedral units behave uniquely compared to others. It softens at Tc as a function of composition and it also softens as a function of temperature as Tc is approached from above.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 24: Symposium B – Defect Properties and Processing of High-Technology Nonmetallic Materials , 1983 , 81
Copyright
Copyright © Materials Research Society 1984

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Footnotes

*

Work supported by the U.S. Department of Energy.

References

REFERENCES

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