すべて の"道"は 岩塩 の 構造 に つながる
Matthew Jankousky1, Helen Chen2, Andrew Novick1
1Colorado School of Mines, Golden, Colorado 80401, United States.
Journal of the American Chemical Society
|August 7, 2024
まとめ
岩塩の結晶構造が優位であるのは,それが最も構成空間を占め,他の構造が急速にそれに変換するためです. これは,なぜそれが
科学分野:
- 材料科学
- 固体物理学
- クリスタルグラフィー
背景:
- 岩塩の結晶構造は二次化合物で一般的です.
- 岩塩基状態の化合物は,通常,長寿命の転移性ポリモルフがない.
研究 の 目的:
- 岩塩化合物における多形性の欠如の理由を調査する.
- 岩塩構造の統計的意義と運動的安定性を理解する.
主な方法:
- ランダムな構造サンプリングを用いて 構成空間を探求した.
- 構造的安定性を評価するために変換運動モデルを使用した.
- 3つの代表的な岩塩化合物を研究した.MgO,TaC,PbTe.
主要な成果:
- ランダムな構造サンプリングは,MgO,TaC,PbTeの構成空間において,岩塩の引き寄せ盆が統計的に優位であることを示した.
- A1B1原型457種を含む他の関連する構造が岩塩構造に急速に変化することを示した.
- 岩塩構造は,環境条件下での唯一の安定した選択肢であることが判明しました.
結論:
- 岩塩構造の優位性は,その大きな引き寄せ盆と他の相からの急速な変容運動に起因する.
- これらの発見は,二元岩塩化合物の多形性の欠如を説明します.
- この研究は,高エントロピーのセラミックと無秩序な三次ナトリドの岩塩の選択に関する洞察を提供し,固体における転移安定状態を予測するのに役立ちます.
さらに関連する動画
関連する概念動画
Ionic Crystal Structures
14.2K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.2K
Design Example: Alignment of a Road Line Using GIS
47
The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
47
Shape and Texture of Coarse Aggregate
199
Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
199
Stone Masonry
102
Stone masonry is a construction technique that uses individual stones to build structures and can be categorized into two main types: rubble and ashlar. Rubble masonry uses uneven, naturally shaped stones such as river rocks or fragments from quarries. This method often requires the mason to select and possibly shape each stone to fit the designated space, ensuring a proper build, even with irregular stone sizes and shapes. Ashlar masonry, on the other hand, employs uniformly cut stones that...
102
Unsoundness of Aggregate due to Volume Change
104
Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
104
Types of Building Stone
96
Building stones, essential materials for construction, are extracted from natural rock deposits and processed into specific forms and dimensions suitable for various building applications. These stones are broadly classified into three types based on their geological formation: igneous, sedimentary, and metamorphic.
Igneous rocks are formed from the solidification of magma or lava. An example is granite, known for its durability and resistance to weathering, making it ideal for parts of...
Igneous rocks are formed from the solidification of magma or lava. An example is granite, known for its durability and resistance to weathering, making it ideal for parts of...
96


