Abstract
NaNbO3 and (Sr,Ca)TiO3 exhibit an unusual complex sequence of temperature- and pressure-driven structural phase transitions. We have carried out lattice dynamical studies to understand the phonon modes responsible for these phase transitions. Inelastic neutron scattering measurements using powder samples were carried out at the Dhruva reactor, which provide the phonon density of states. Lattice dynamical models have been developed for SrTiO3 and CaTiO3 which have been fruitfully employed to study the phonon spectra and vibrational properties of the solid solution (Sr,Ca)TiO3.
Similar content being viewed by others
References
M E Lines and A M Glass, Principles and application of ferroelectrics and related materials (Clarendon, Oxford, 1977)
Xu Yuhuan, Ferroelectric materials and their applications (Elsevier Science, North-Holland, 1991)
Y Saito et al, Nature (London) 423, 84 (2004)
E Cross, Nature (London) 432, 24 (2004)
S K Mishra et al, Phys. Rev. B76, 024110 (2007) and references therein
R Ranjan, D Pandey and N P Lalla, Phys. Rev. Lett. 84, 3726 (2000)
S K Mishra, Studies on structures and phase transitions in [Sr,Ca]TiO 3 ceramics, Ph.D. Thesis (Banaras Hindu University, 2004) and references therein
S L Chaplot et al, Eur. J. Mineral. 14, 291 (2002)
S L Chaplot (unpublished)
A Sjolander, Arkiv fur Fysik 14, 315 (1958)
W Taylor and A F Murray, Solid State Commun. 31, 937 (1979)
R A Cowely, Phys. Rev. 134, A981 (1964)
A S Barker and M Tinkham, Phys. Rev. 125, 1527 (1962)
W G Spitzer, R C Miller, D A Kleinman and L E Howarth, Phys. Rev. 126, 1710 (1960)
W G Stirling, J. Phys. C5, 2711 (1972)
N Choudhury et al, Phys. Rev. B77, 134111 (2008)
N Sai and D Vanderbilt, Phys. Rev. B62, 13942 (2000)
C Lasota et al, Ferroelectrics 194, 109 (1997)
S K Mishra et al (unpublished)
Brian F Woodfield et al, J. Chem. Thermodyn. 31, 1573 (1999)
C J Shomate et al, J. Am. Chem. Soc. 68, 964 (1946)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Mishra, S.K., Mittal, R., Choudhury, N. et al. Inelastic neutron scattering and lattice dynamics of NaNbO3 and Sr0.70Ca0.30TiO3 . Pramana - J Phys 71, 1129–1134 (2008). https://doi.org/10.1007/s12043-008-0235-5
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12043-008-0235-5