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相关概念视频

Solid–Solid Solutions01:24

Solid–Solid Solutions

The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.

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相关实验视频

Updated: May 12, 2026

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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在BiFeO3-BaTiO3-基于固体溶液中的分散铁电相位过渡依赖光伏效应.

Jin-Quan Dou1,2, Gao-Chao Zhao2,3, Lei Xie1,2

  • 1Anhui University, Hefei, Anhui 230601, People's Republic of China.

Inorganic chemistry
|November 22, 2024
PubMed
概括

铁电半导体中的光伏效应尚未完全理解. 这项研究表明,它更多地取决于晶体结构和域动态,而不是BFC-BTM材料中的铁电极化.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 固态化学 固态化学

背景情况:

  • 铁电 (FPV) 半导体中的光伏效应正在引起人们的兴趣,但其潜在的微观机制仍然不清楚.
  • 了解这些机制对于开发基于铁电材料的新型光电子设备至关重要.

研究的目的:

  • 研究晶体结构,介电,铁电和域特征对FPV效应的影响.
  • 为了阐明相位转换和开放电路光伏 (V_OC) 之间的关系,在0.7BiFeO3-0.3BaTiO3系统中添加了Cr和Mn.

主要方法:

  • 合成和表征0.7BiFe1-xCrxO3-0.3BaTi1-yMnyO3 (BFC-BTM) 系统的不同Cr和Mn含量 (0.01 ≤ x ≤ 0.07).
  • 使用各种实验技术分析晶体结构,相变,铁电性质和域演变.
  • 测量光伏响应,特别是开放电路光伏 (V_OC).

主要成果:

  • 对于x ≥0.05,观察到从方圆/四边形到伪立方相的结构过渡,伴随着减少格子扭曲和宏大铁电域的损失.
  • 对于x ≥ 0.05.5,观察到放松铁电相变的扩散度显著增加和V_OC的减少.
  • 铁电极化显示出微弱的变化,表明FPV效应在FPV效应中的作用有限.

结论:

  • 在BFC-BTM中的FPV效应强烈依赖于扩散放松铁电相变和晶体结构,而不是铁电极化.
  • 这些发现表明,亚微米域动力学和与非中心对称相关的变速电流机制在FPV效应中起着关键作用.
  • 这项研究为FPV效应的微观起源提供了洞察力,指导了先进铁电光伏设备的设计.