Structure, frequency dependent dielectric properties and domain configuration of PMN–PFN–PT single crystal

• Published in: Journal of crystal growth Vol. 401; pp. 414 - 417
• Main Authors: Luo, Nengneng, Li, Qiang, Yan, Qingfeng, Zhang, Yiling, Xia, Zhiguo, Chu, Xiangcheng
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.09.2014; Elsevier
• Subjects: A1. Dielectric property; A1. Domain structure; A1. Polarized light microscopy (PLM); A2. Growth from high temperature solutions; B2. PMN–PFN–PT single crystal; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Growth from solutions; Materials science; Methods of crystal growth; physics of crystal growth; Physics; A1. Domain structure; A2. Growth from high temperature solutions; A1. Dielectric property; B2. PMN–PFN–PT single crystal; A1. Polarized light microscopy (PLM); Temperature dependence; Frequency dependence; Total energy; Tetragonal lattices; Dielectric properties; Relaxor; Phase transitions; Ferroelectric transitions; Monocrystals; Domain structure; Morphology; Dielectric losses; Crystal growth from solutions; Slow cooling; B2. PMN-PFN-PT single crystal; Permittivity; X-ray diffraction analysis
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2013.12.017

Pb(Mg1/3Nb2/3)O3–Pb(Fe1/2Nb1/2)O3–PbTiO3 (PMN–PFN–PT) single crystal was grown successfully from high temperature solution by slow cooling method. Structure, frequency dependent dielectric properties and domain configuration of [001]-oriented single crystal have been investigated. X-ray diffraction analysis showed that the as-grown single crystal had a pure perovskite structure with tetragonal symmetry at room temperature. The temperature dependent dielectric permittivity showed only one dielectric anomaly, indicating the ferroelectric–paraelectric phase transition. According to the modified Curie–Weiss relationship, as-grown PMN–PFN–PT single crystal was in an intermediate state between normal and relaxor ferroelectrics. Dielectric permittivity and loss of [001]-oriented PMN–PFN–PT single crystal at room temperature decreased sharply with increasing frequency, which were different from those of PMN–PT65/35 single crystal. Domain configuration of [001]-oriented PMN–PFN–PT single crystal was observed for the first time by using a polarized light microscopy (PLM). The extinction of 90° domains at P/A:0° revealed a tetragonal structure. Domains along (001) face exhibited a straight stripe-like morphology with domain size on the scale of 10μm in average, combining with some much smaller domains about 3–5μm in width at the intersection of domain blocks which helps to minimize its total energy. •PMN–PFN–PT single crystal was grown successfully from high temperature solution by slow cooling method.•The as-grown PMN–PFN–PT single crystal was in an intermediate state between normal and relaxor ferroelectrics.•Dielectric permittivity and loss of [001]-oriented PMN–PFN–PT single crystal exhibited different frequency dependence with that of PMN–PT65/35 single crystal.•Domain configuration of poled [001]-oriented PMN–PFN–PT was observed for the first time using a polarized light microscopy (PLM).