结构相位转换驱动的介电和光学特性,在Sr2+修改的BaTiO3陶中减少带隙
Jyotirekha Mallick1, Ajay Kumar1, Tupan Das1
1Department of Physics, Indian Institute of Technology Patna, Bihta, Patna 801106, India.
概括
无的酸陶 (BSTO) 陶由于晶体对称过渡而具有可调节的光学和介电性质. 这项研究探讨了BSTOTO.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 纳米技术纳米技术
背景情况:
- 铁电材料表现出与晶体对称性相关的独特光敏性质.
- 非中心对称和中心对称系统由于其独特的行为,因此具有重要的研究兴趣.
研究的目的:
- 合成和研究无多晶酸 (Ba1-xSrxTiO3,BSTO) 的晶体结构,介电,光学和光电感应特性,具有不同度的Sr (0 ≤ x ≤ 0.3).
- 探索晶体结构转变与观察到的物理性质之间的相关性,用于潜在的设备应用.
主要方法:
- 无多晶Ba1-xSrxTiO3 (BSTO) 陶的合成.
- 实验和理论研究以证实晶体对称过渡,并使用Tauc图谱方法分析光带间隙.
- 在照明下测量介电性质和光电流响应.
主要成果:
- 在BSTO (0 ≤ x ≤ 0.3) 陶中观察到具有Sr替换的晶体对称性过渡,导致带间隙减少 (3.615 eV到3.212 eV).
- 对于Ba0.76Sr0.24TiO3,在低频率下观察到的最大介电常数为5327,由于引入非极相,在更高的Sr度下降.
- 观察到显著的光电流,表明光子影响的光敏行为.
结论:
- 晶体结构和BSTO陶的物理性质 (介电,光学,光电流) 之间存在强烈的相关性.
- 该研究提供了对设计具有增强光敏性质的铁电系统的见解,用于设备应用.
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