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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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.
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Crystal Growth: Principles of Crystallization01:25

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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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...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Common misconceptions in crystallography and crystal optics.

Lluís Casas1

  • 1Unitat de Cristallografia i Mineralogia, Departament de Geologia Universitat Autònoma de Barcelona (UAB) Edifici C Cerdanyola del Vallès Catalonia08193 Spain.

Journal of Applied Crystallography
|February 6, 2026
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Summary
This summary is machine-generated.

Many scientific papers incorrectly use terms like "X-ray spectra" for diffraction patterns. This study analyzes six common crystallography misconceptions to improve academic communication and teaching.

Keywords:
X-ray diffractionXRD spectracell restrictionscrystal opticsmisconceptions

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Area of Science:

  • Crystallography
  • Mineral Optics
  • Crystal Optics

Background:

  • Misconceptions in scientific literature are common, affecting accurate communication.
  • Specific errors include calling X-ray diffraction patterns 'spectra' and misusing crystal optics terminology.
  • Prevalence of these errors impacts scientific understanding and education.

Purpose of the Study:

  • To identify and analyze six recurring misconceptions in crystallography and crystal optics.
  • To assess the prevalence of these misconceptions in peer-reviewed scientific literature.
  • To promote the correction of these errors in academic communication and teaching.

Main Methods:

  • Analysis of six common crystallography misconceptions.
  • Statistical assessment of misconception prevalence in peer-reviewed literature.
  • Review of terminology in crystal optics and X-ray diffraction.

Main Results:

  • One in five papers incorrectly refers to X-ray diffraction patterns as 'X-ray spectra'.
  • Terminology like 'parallel Nicols' is frequently misused in crystal optics.
  • Zoning is sometimes mistaken for twinning in polarizing microscopy observations.

Conclusions:

  • Correcting these misconceptions is crucial for accurate scientific communication and education.
  • Understanding and addressing misconceptions can serve as a valuable educational tool.
  • This study aims to enhance talent development by improving foundational scientific understanding.