Theoretical description of ABO3 relaxor ferroelectric: A review

Significant similarities exist between spin glasses and relaxor ferroelectric. Because of the wealth of available knowledge both in experimental and theoretical aspects in the former, attempt has been made by many workers to deal the relaxor behavior in analogy with the spin glasses. However, the nature of diffused phase transition in relaxor ferroelectric remains controversial. To overcome this difficulty, many workers extended the above model to a new type of dipolar glasses, namely spherical vector glasses in which order parameter field is described as a continuous vector field of variable length instead of fixed length as proposed earlier. The present review is aimed to focus on all the models.