Phase diagram of (1-x)PbMg1/3Nb2/3O3-xPbTiO(3) single crystals

作者：Qiu, J. H.^*; Ding, J. N.; Yuan, N. Y.; Wang, X. Q.

来源：Journal of Applied Physics, 2015, 117(7): 074101.

DOI：10.1063/1.4908112

• DIELECTRIC-CONSTANT TUNABILITY
• PIEZOELECTRIC PROPERTIES
• PB(MG1/3NB2/3)O-3-PBTIO3 CRYSTALS
• ORIENTATION DEPENDENCE
• ELECTRIC-FIELD
• BOUNDARY
• SEQUENCE
• BEHAVIOR
• GROWTH

Experimental results indicated that the Rhombohedral (R) phase, Tetragonal (T) phase, Cubic (C) phase, and the Monoclinic (M-C) phase are the stable phases in ferroelectric (1 - x)PbMg1/3Nb2/3O3-xPbTiO(3) single crystals. The Monoclinic M-C phase, around the morphotropic phase boundary, was observed in a composition region (0.31 < x < 0.37) between the rhombohedral and tetragonal phase. However, the recent theory poses a challenge in explaining the "temperature-composition" phase diagram completely. Here, an eighth-order expansion of Landau-Dovenshire theory is constructed to investigate the phase transition properties of (1 - x)PbMg1/3Nb2/3O3 - xPbTiO(3) single crystals. A full phase diagram is obtained in phenomenological parameter space which is in good accordance with experimental observation. The ferroelectric, dielectric, and piezoelectric properties are calculated in (1 - x)PbMg1/3Nb2/3O3-xPbTiO(3) single crystals with different compositions.

• 出版日期2015-2-21
• 单位常州大学; 江苏大学