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関連する概念動画

Solid–Solid Solutions01:24

Solid–Solid Solutions

52
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.
52
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
16.4K
Liquid–Solid Solutions01:29

Liquid–Solid Solutions

45
The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
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Updated: Mar 14, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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超硬いレニウム/タングステン二酸化物 固体溶液

Andrew T Lech, Christopher L Turner, Jialin Lei

  • 1Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University , Richmond, Virginia 23284, United States.

Journal of the American Chemical Society
|October 11, 2016
PubMed
まとめ
この要約は機械生成です。

レニウム二酸化物 (ReB2) は,最大48%のボルンガムでも超硬いままである. この発見は,高度なアプリケーションにおける超硬質ReB2構造材料の可能性を拡大する.

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関連する実験動画

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Negative Additive Manufacturing of Complex Shaped Boron Carbides
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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科学分野:

  • 材料科学
  • 固体化学
  • クリスタルグラフィー

背景:

  • レニウム二酸化物 (ReB2) は,独特の波紋性ボロン層構造を持つ超硬質金属化合物である.
  • トングステンジボリド (WB2) はハイブリッド構造を示し,超硬さに対する構造的敏感性を示す.

研究 の 目的:

  • トングステン・レニウム二酸化物固体溶液の構造的安定性と機械的性質を調査する.
  • 超硬さを維持しながらReB2構造のトングステン置換の限界を決定する.

主な方法:

  • トングステン・レニウム二酸化物の固体溶液の合成
  • 構造分析のための粉末X線とニュートロン difraktion.
  • 機械的性質の評価のためのマイクロおよびナノインデント硬さ試験.

主要な成果:

  • ReB2タイプの構造は,トングステンの含有量が50%近くまで維持されます.
  • 網状のパラメータは,トラングステンの含有量で線形的に増加します.
  • すべての組成物 (0-48原子% W) は超硬さを示し,48原子%の固体溶液の質量モジュールは純粋なReB2と同等である.

結論:

  • トングステン・レニウム二酸化物固体溶液は,幅広い組成範囲で超硬さを維持しています.
  • ReB2構造タイプは,超硬質特性と強く関連している.
  • 関連する固体溶液と三元化合物のさらなる研究が必要である.