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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Gauss's Law in Dielectrics01:17

Gauss's Law in Dielectrics

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Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
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Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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組成的に調節された鉄電性材料における幾何学的挫折.

Narayani Choudhury1, Laura Walizer, Sergey Lisenkov

  • 1Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA. narayani@uark.edu

Nature
|February 11, 2011
PubMed
まとめ

以前,磁気系で研究されていた幾何学的な挫折は,現在,鉄電性材料で発生することが示されています. 組成的に等級化されたフェロエレクトリックは,エキゾチックなストライプフェーズと重要な現象を示し,それらを幾何学的挫折と結びつける.

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マテリアルサイエンス 材料科学
  • 固体物理 固体物理学

背景:

  • 幾何学的な挫折は,競合する相互作用と格子幾何学から生じ,磁気システムのエキゾチックな現象につながります.
  • 例としては,スピンアイス,スピン液体,スピングラス,分数電荷定量化,磁気モノポールの例があります.
  • 幾何学的な挫折メカニズムは,リラクサー/マルチフェロイック行動,巨大な磁気容量結合,および高温超伝導性に関与しています.

研究 の 目的:

  • 鉄電性材料における幾何学的挫折の表れを調査する.
  • 幾何学的挫折に関する組成的に等級化されたフェロエレクトリックの性質を探求する.

主な方法:

  • 第一原理の計算は,組成的に等級化された鉄電性を研究するために使用されました.
  • 分析は,これらの材料内の幾何学的な挫折の指紋を特定することに焦点を当てました.

主要な成果:

  • 組成的に等級化された鉄電学は,変性エネルギー表面と臨界現象を含む幾何学的挫折の特徴を示します.
  • 複雑な空間的組織,スパイラル状態,トポロジカルな欠陥,曲線を持つ新しいストライプフェーズが観察されました.
  • これらの発見は,フェロエレクトリックを幾何学的な挫折を示すことができる材料のクラスとして確立します.

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結論:

  • 組成的に等級化された鉄電学は,幾何学的挫折を研究するための新しい境界を表しています.
  • これらの材料は重要なリンクとして機能し,鉄電学を幾何学的に挫折したシステムのより広範な理解に統合します.
  • アブ・イニシオ計算は,この新しい種類の挫折した材料に関する微細な洞察を深める.