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相关概念视频

Regioselective Formation of Enolates01:33

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As depicted in the figure below, the unsymmetrical ketones can form two possible enolates:  less substituted or more substituted enolates. Usually, the thermodynamic enolates are formed from the more substituted α-carbon atom, while the kinetic enolates are formed faster by deprotonation from the less substituted position. The thermodynamic enolates have lower energy, so they are  more stable. But the energy required to form kinetic enolates is less.
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Stability of Equilibrium Configuration01:23

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Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
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相关实验视频

Updated: Jan 17, 2026

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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超稳定TiO2阶段的压力驱动选择性稳定.

Jihoon Jeon1,2, Myungsu Jang1,2, Gwang Min Park1,2

  • 1KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea.

Small (Weinheim an der Bergstrasse, Germany)
|September 19, 2025
PubMed
概括

本研究展示了如何使用金属基板控制二氧化 (TiO2) 晶体结构. 这种应变驱动方法稳定了用于先进材料应用的独特TiO2相.

关键词:
TiO2‐IIII 的含量是什么?原子层沉积的原子层沉积.变态稳定阶段的变态稳定阶段这种类型的乳酸盐是 rutile.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 薄膜沉积的情况
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 在薄膜中稳定转移稳定的二氧化 (TiO2) 阶段是困难的.
  • 控制TiO2相对于调整其电子和光学性能至关重要.

研究的目的:

  • 为了证明一种应变驱动的方法来选择性地稳定超稳定TiO2相.
  • 为了研究基板方向和格子匹配在相位选择中的作用.

主要方法:

  • 低温原子层沉积 (ALD) 的TiO2.
  • 使用以111为导向的面中心立方体 (FCC) 金属基板 (Ir, Pt).
  • 通过X射线衍射分析TiO2的相位形成和方向.

主要成果:

  • 实现了对orthorhombic TiO2-II和rutile相的选择性稳定.
  • 经过格子匹配,Epitaxial (111) FCC基板通过格子匹配促进了TiO2-II形成.
  • 多晶 (111) 纹理的FCC基板导致由于应力松而形成路.
  • 与anatase相比,TiO2-II薄膜表现出增强的特性:较高的密度,折射率和介电常数 (≈75-77) .

结论:

  • 在平面内应变和格子匹配对于设计超稳定的TiO2相是有效的.
  • 这种方法为功能性氧化物薄膜的阶段选择性生长提供了低温路径.