Effect of domains configuration on crystal structure in ferroelectric ceramics as revealed by XRD and dielectric spectrum

摘要

It is well known that domains and crystal structure control the physical properties of ferroelectrics. The ex-situ electric field-dependent structural study, carried out in unpoled/poled crushed powder and bulk samples for (Li0.5Nd0.5)(2+) modified 0.95Bi(0.5)Na(0.5)TiO(3)-0.05BaTiO(3) solid solution, established a correlation between domain configuration and crystal structure variation. Under applying electric field, the smeared ferroelectric phase structure due to coherence diffraction effect of nanodomains reappeared due to obsolescent coherence effect associated with the field-induced ordered nanodomains. The macroscopic characterizing techniques of domain configuration such as dielectric constant spectroscopy and X-ray diffraction measurement can provide a basis for understanding the correlation between domains configuration and crystal structure in ferroelectric ceramics.