Pressure-induced structural phase transitions in the multiferroic four-layer Aurivillius ceramic Bi5FeTi3O15

被引：14
|
作者：
Ferreira, Wellington Castro [1 ]
Clemente Rodrigues, Gelson Luiz [1 ,4 ]
Araujo, Bruno Sousa [1 ]
Andrade de Aguiar, Francisco Andre [2 ,5 ]
Almeida de Abreu Silva, Ariel Nonato [3 ]
Almeida Fechine, Pierre Basilio [2 ]
de Araujo Paschoal, Carlos William [1 ]
Ayala, Alejandro Pedro [1 ]
机构：
[1] Univ Fed Ceara, Dept Fis, BR-60440900 Fortaleza, CE, Brazil
[2] Univ Fed Ceara, Dept Quim Analit & Fisicoquim, BR-60440900 Fortaleza, CE, Brazil
[3] Univ Fed Maranhao, Coordenacao Ciencias Nat, Campus Bacabal, BR-65700000 Bacabal, MA, Brazil
[4] Inst Fed Piaui, Campus Oeiras, BR-64500000 Oeiras, PI, Brazil
[5] Univ Estadual Ceara, Fac Educ Crateus, BR-63700000 Crateus, CE, Brazil
来源：
CERAMICS INTERNATIONAL | 2020年 / 46卷 / 11期
关键词：
Synchrotron X-ray diffraction; Aurivillius phase; Structural phase transition; X-RAY-DIFFRACTION; DIELECTRIC-PROPERTIES; MAGNETIC-PROPERTIES; TEMPERATURE; DEPENDENCE; BEHAVIOR; STRAIN; MODES;
D O I：
10.1016/j.ceramint.2020.04.122
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The structural stability of the multiferroic four-layer Aurivillius ceramic Bi5FeTi3O15 (BFTO) under hydrostatic pressure was investigated in situ by synchrotron X-ray powder diffraction (SXRPD) and Raman spectroscopy. Measurements performed up to 15 GPa allowed the identification of two well-defined structural phase transitions. The orthorhombic phase (at ambient conditions) transforms into a tetragonal one around 3.2 GPa and a new orthorhombic phase rises around 7.5 GPa. Both phase transitions are evidenced by the pressure dependence of the lattice parameters and vibrational mode frequencies. The analysis of the induced strain indicates that the transitions are of second-order and first-order, respectively. Subtle changes in the Raman spectra and powder patterns suggest the onset of a new phase around 10.5 GPa.
引用
收藏
页码：18056 / 18062
页数：7
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