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Crystal Field Theory
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Updated: Jan 28, 2026

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Ted Janssen and aperiodic crystals.

Marc de Boissieu1

  • 1Université Grenoble Alpes, CNRS, SIMaP, 1130 Rue de la Piscine, BP 75, 38402 St Martin d Heres, France.

Acta Crystallographica. Section A, Foundations and Advances
|March 2, 2019
PubMed
Summary
This summary is machine-generated.

Ted Janssen pioneered superspace crystallography, enhancing the understanding of aperiodic crystals. His work advanced the study of their structure, stability, and physical properties.

Keywords:
Ted Janssenaperiodic crystalslattice dynamicsphasonssuperspace crystallography

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Area of Science:

  • Crystallography
  • Materials Science
  • Solid State Physics

Background:

  • Aperiodic crystals possess long-range order without traditional 3D lattice translations.
  • This class includes modulated phases, composites, and quasicrystals.
  • Understanding their atomic structure and properties is crucial in materials science.

Purpose of the Study:

  • To review the significant contributions of Ted Janssen (1936-2017) to the field of aperiodic crystals.
  • To highlight his foundational work in superspace crystallography.
  • To discuss his research on the stability, dynamics, and physical properties of these unique materials.

Main Methods:

  • Development of the superspace crystallography theory.
  • Theoretical analysis of crystal structures.
  • Exploration of physical properties through theoretical and collaborative experimental approaches.

Main Results:

  • Introduction of superspace crystallography, enabling a deeper understanding of aperiodic crystal structures by incorporating an additional dimension.
  • Significant advancements in comprehending the stability and dynamics of aperiodic systems.
  • Elucidation of the fascinating physical properties inherent in these non-traditional crystalline materials.

Conclusions:

  • Ted Janssen's work fundamentally advanced the field of aperiodic crystallography.
  • His development of superspace theory remains a cornerstone for studying complex crystal structures.
  • His collaborative spirit fostered interdisciplinary progress in understanding aperiodic materials.