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Unit Cells01:18

Unit Cells

A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
The Seven Crystal Systems: Overview01:24

The Seven Crystal Systems: Overview

Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific requirements are not imposed on the...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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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Updated: Jun 22, 2026

Preparation of Macroporous Epitaxial Quartz Films on Silicon by Chemical Solution Deposition
07:37

Preparation of Macroporous Epitaxial Quartz Films on Silicon by Chemical Solution Deposition

Published on: December 21, 2015

天然の準結晶である.

Luca Bindi1, Paul J Steinhardt, Nan Yao

  • 1Museo di Storia Naturale, Sezione di Mineralogia, Università degli Studi di Firenze, Firenze I-50121, Italy.

Science (New York, N.Y.)
|June 6, 2009
PubMed
まとめ
この要約は機械生成です。

禁じられた対称性を持つ固体である自然に存在する準結晶が発見されました. このアルミニウム,銅,鉄の合金は,準結晶が形成され,地質条件下で安定し続けることを示唆しています.

さらに関連する動画

Epitaxial Nanostructured α-Quartz Films on Silicon: From the Material to New Devices
11:34

Epitaxial Nanostructured α-Quartz Films on Silicon: From the Material to New Devices

Published on: October 6, 2020

On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature
07:42

On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature

Published on: March 11, 2022

関連する実験動画

Last Updated: Jun 22, 2026

Preparation of Macroporous Epitaxial Quartz Films on Silicon by Chemical Solution Deposition
07:37

Preparation of Macroporous Epitaxial Quartz Films on Silicon by Chemical Solution Deposition

Published on: December 21, 2015

Epitaxial Nanostructured α-Quartz Films on Silicon: From the Material to New Devices
11:34

Epitaxial Nanostructured α-Quartz Films on Silicon: From the Material to New Devices

Published on: October 6, 2020

On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature
07:42

On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature

Published on: March 11, 2022

科学分野:

  • 材料科学 材料科学とは
  • ミネラロジーは,鉱物学です.
  • クリスタログラフィーです.

背景:

  • 準結晶は,周期性結晶では見られない5倍対称性などの対称性を持つユニークな原子配列を持っています.
  • 以前は,知られている準結晶はすべて,実験室でのみ合成されていました.
  • 準結晶の形成と安定性の研究は,エキゾチックな物質状態を理解するために重要である.

研究 の 目的:

  • 自然に生じる準結晶の発見を報告するために.
  • この天然準結晶の構造と組成を特徴づける.
  • 地質学的条件に対する自然準結晶形成の影響を調査する.

主な方法:

  • ロシアのコリアク山脈から採取したサンプルを鉱物学的に分析した.
  • 原子構造と対称性に敏感な技術を使用して準結晶相の識別.
  • 準結晶および関連する鉱物の元素組成を決定するための化学分析.

主要な成果:

  • 六つの異なる五重対称性軸を持つ自然に発生するイコサヘドラル準結晶の証拠.
  • この鉱物は,アルミニウム,銅,鉄の合金である.
  • それは,結晶のカチルキートとキューパライトの隣にマイクロメートルの大きさの粒として発生します.

結論:

  • この発見は,準結晶が自然地質条件下で形成され,持続する最初の証拠を提供します.
  • この発見は,準結晶の独占的な合成起源に関する以前の仮定に異議を唱える.
  • このユニークな鉱物の形成に起因する特定の自然過程を明らかにするために,さらなる研究が必要である.