Phase transitions in barium-strontium titanate films on MgO substrates with various orientations

被引：10
|
作者：
Anokhin, A. S. [1 ,2 ]
Razumnaya, A. G. [1 ]
Yuzyuk, Yu. I. [1 ]
Golovko, Yu. I. [2 ]
Mukhortov, V. M. [2 ]
机构：
[1] Southern Fed Univ, Ul Bolshaya Sadovaya 105-42, Rostov Na Donu 344006, Russia
[2] Russian Acad Sci, Southern Sci Ctr, Pr Chekhova 41, Rostov Na Donu 344006, Russia
来源：
PHYSICS OF THE SOLID STATE | 2016年 / 58卷 / 10期
基金：
俄罗斯科学基金会;
关键词：
PHENOMENOLOGICAL DESCRIPTION; FERROELECTRIC PEROVSKITES; SRTIO3; FILMS; SOFT MODES; THIN-FILM; BATIO3; SPECTROSCOPY; SCATTERING; CRYSTALS; SPECTRA;
D O I：
10.1134/S1063783416100048
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
A comparative study of the lattice dynamic upon phase transitions in a polycrystalline Ba0.8Sr0.2TiO3 (BST) film on a Pt substrate and in epitaxial BST films grown on various sections of an MgO substrate has been performed by Raman spectroscopy. It has been found that different sequences of phase transitions take place in these films. The BST/Pt films demonstrate the same sequence of phase transitions that is observed in the bulk ceramics. The hardening of a soft mode in BST/(001)MgO and BST/Pt films shows that the transition from the tetragonal ferroelectric phase to the paraelectric phase has features of the displacement-type phase transition and also the order-disorder phase transition. When approaching the ferroelectric transition temperature, the soft mode in the BST/(111)MgO film is softened, following the Cockran law, which indicates the displacement-type phase transition.
引用
收藏
页码：2027 / 2034
页数：8
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