Effects of Ba2+/Sr2+ ratio on the microstructure, dielectric and ferroelectric properties of BaxSr(1-x)TiO3 films prepared by micro-arc oxidation

被引：1
作者：
Wang, Min [1 ,2 ]
Zuo, Xi [1 ]
Li, Kang [2 ]
Cao, Genghua [1 ]
机构：
[1] Guangdong Polytech Normal Univ, Coll Mech Engn, Guangzhou, Peoples R China
[2] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou, Peoples R China
来源：
SURFACE ENGINEERING | 2021年 / 37卷 / 12期
关键词：
Micro-arc oxidation; microstructure; dielectric property; barium strontium titanate; PLASMA ELECTROLYTIC OXIDATION; THIN-FILMS; CORROSION PERFORMANCE; ELECTRICAL-PROPERTIES; MAGNESIUM ALLOY; HIGH TUNABILITY; TEMPERATURE; SUBSTRATE; OXYGEN; RELAXATION;
D O I：
10.1080/02670844.2021.2005964
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
BaxSr(1-x)TiO3 (BST) thin films are in situ deposited on a Ti matrix through the micro-arc oxidation technique, using a mixed aqueous solution of Ba(OH)(2)center dot 8H(2)O, Sr(OH)(2)center dot 8H(2)O and 0.05 M EDTA as the electrolyte. The influence of the Ba2+/Sr2+ ratio on the phase composition, microstructure and properties of the BST thin films is investigated. Ba0.6Sr0.4TiO3, Ba0.5Sr0.5TiO3, and Ba0.4Sr0.6TiO3 thin films have a cubic phase, while Ba0.8Sr0.2TiO3 and Ba0.7Sr0.3TiO3 thin films have a tetragonal phase. When the concentration of Ba2+ in the electrolyte surpasses that of Sr2+, the width of micro-arc holes and the surface roughness of the film grow as the Ba2+ concentration rises. Furthermore, the dielectric and ferroelectric properties of BST films are favorably connected with the surface morphology. When the Ba2+ concentration is 0.06 M, the film has the best compactness and smoothness. In addition, the highest capacitance and lowest dielectric loss are achieved.
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页码：1550 / 1560
页数：11
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