六边形 ABO 的 B 位点上的尾效应:结构演变和高和低损耗介电
Jyoti Chahal1,2, Rakesh Shukla1,2, Nitin Kumar3
1Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
Inorganic chemistry
|May 16, 2025
概括
高氧化物提供了增强的功能. 研究人员稳定了基于YInO3的新型六角组合物,实现了改善的电气性能,如低介电损耗和超低泄漏电流在Y(In0.25Mn0.25Fe0.25Ga0.25) O3.3.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 氧化物材料 氧化物材料
背景情况:
- 高氧化物 (HEO) 是有前途的高级功能.
- 在像六角形ABO3 (P63cm) 这样的离子大小敏感结构中稳定HEOs具有挑战性.
- 六角形的 ABO3 结构由于离子位置非中心对称而表现出不适当的铁电性.
研究的目的:
- 为了稳定一种基于YInO3的新型高六角构成.
- 调查组合随机化对结构和电气性能的影响.
- 探索先进电子设备中的潜在应用.
主要方法:
- 合成单相六边形多态:YInO3,Y(In0.5Mn0.5)O3,Y(In0.33Mn0.33Fe0.33)O3,和Y(In0.25Mn0.25Fe0.25Ga0.25)O3.3. 这两种多态的合成方法是:
- 使用X射线衍射 (XRD) 和拉曼光谱来确认相纯度和结构随机化的表征.
- 卡尔维特热量计以确定形成的和确认稳定.
- 热膨胀和微观结构性质的分析.
主要成果:
- 成功合成了YInO3的单相六角多态形态,并增加了B位置换.
- XRD和拉曼数据表明单个六角阶段具有显著的结构随机化和粒径减小.
- 稳定被形成的正力证实.
- 观察到差异性热膨胀,与c轴相比,a/b轴显示双倍膨胀.
- 在0.25Mn0.25Fe0.25Ga0.25) O3中显示了低介电损耗 (~0.0085) 和超低的泄漏电流 (5.2 × 10−10 A/cm2至150°C).
结论:
- 基于YInO3的新型高六角组合物已成功稳定.
- 通过热量计测量证实了值稳定.
- 组合随机化影响了结构特征和热膨胀行为.
- 与未使用过的YInO3.3相比,Y(In0.25Mn0.25Fe0.25Ga0.25) O3组合表现出明显改善的介电和泄漏性能.
相关概念视频
02:39Entropy
35.0K
Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
35.0K
01:18Entropy
3.5K
The first law of thermodynamics is quantitatively formulated via an equation relating the internal energy of a system, the heat exchanged by it, and the work done on it. A quantitative formulation of the second law of thermodynamics leads to defining a state function, the entropy.
When an ideal gas expands isothermally, the disorder in the gas increases. From the molecular perspective, the gas molecules have more volume to move around in.
Consider an infinitesimal step in the expansion, which...
When an ideal gas expands isothermally, the disorder in the gas increases. From the molecular perspective, the gas molecules have more volume to move around in.
Consider an infinitesimal step in the expansion, which...
3.5K
03:00Standard Entropy Change for a Reaction
24.1K
Entropy is a state function, so the standard entropy change for a chemical reaction (ΔS°rxn) can be calculated from the difference in standard entropy between the products and the reactants.
24.1K
02:55The Evidence for Evolution
47.7K
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
47.7K
01:54Convergent Evolution
31.6K
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
31.6K
02:05Entropy and Solvation
8.3K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
8.3K