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Structural Modeling Based on the Oxygen Sublattice Features in the Perovskite Family

Published online by Cambridge University Press:  15 February 2011

L. E. Depero ,
L. Sangaletti ,
F. Parmigiani ,
E. Giulotto  and
L. Rollandi
L. E. Depero
Affiliation:
Istituto Nazionale di Fisica per la Materia e Dipartimento di Chimica e Fisica per i Materiali, Università di Brescia, Via Branže, 38 – 25123 Brescia, ITALY
L. Sangaletti
Affiliation:
Istituto Nazionale di Fisica per la Materia e Dipartimento di Chimica e Fisica per i Materiali, Università di Brescia, Via Branže, 38 – 25123 Brescia, ITALY
F. Parmigiani
Affiliation:
INFM & Politecnico di Milano, Dipt, di Fisica - Milano, ITALY
E. Giulotto
Affiliation:
INF & Univ.di Pavia, Dipt, di Fisica A. Volta -Pavia, ITALY
L. Rollandi
Affiliation:
INF & Univ.di Pavia, Dipt, di Fisica A. Volta -Pavia, ITALY
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Abstract

A new approach based on the study of distortion in the AO3 layer of ABO3 perovskites is proposed with the aim to discuss their ferroelectric properties. Rhombohedral distortions exist for either A-O average distances shorter than 2.7 A (space group Nr.161) or A-O distances larger than 3 Å (space group Nr.160). In the case of small distortions tetragonal or orthorhombic symmetries are preferred. Moreover, a relationship between the dimension of the B cation and the distortion in this type of structure has been established. Preliminary results show interesting correlations between distortions in the AO3 plane and the critical temperature of ferroelectric materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 461
Copyright
Copyright © Materials Research Society 1997

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References

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