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Related Experiment Videos

[The spectroscopic study of topaz].

B Wang1, J Tu

  • 1Northwest Institute of Nuclear Technology, 710024 Xi'an.

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|September 5, 2003
PubMed
Summary

Spectroscopic analysis of topaz reveals structural differences in OH groups between colorless and blue samples, explaining color variations. This research investigates the origin of topaz color using advanced spectral techniques.

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Area of Science:

  • Mineralogy and Spectroscopy
  • Solid-state Physics
  • Gemology

Context:

  • Topaz, a natural gemstone, exhibits color variations.
  • Understanding these variations requires detailed structural and spectroscopic analysis.
  • Previous studies have not fully elucidated the spectroscopic differences linked to color in topaz.

Purpose:

  • To investigate the structural and spectroscopic properties of natural topaz.
  • To analyze colorless and reactor-irradiated blue topaz using Fourier Transform Infrared (FTIR) and FT-Raman spectroscopy.
  • To explore the origin of color in topaz through ultra-violet and visible absorption spectroscopy.

Summary:

  • Fourier Transform Infrared (FTIR) and FT-Raman spectroscopy were employed to study colorless and blue topaz samples.
  • Structural analysis revealed the presence of OH and SiO4 groups, with Si-O vibrations characterized by group theoretical analysis.
  • Significant changes in OH stretching modes were observed between different colored samples, with explanations provided.
  • The origin of color in topaz was preliminarily investigated using ultra-violet and visible absorption spectroscopy.

Impact:

  • Provides a deeper understanding of the relationship between structure and color in topaz.
  • Offers insights into the effects of irradiation on gemstone properties.
  • Contributes to the scientific knowledge base for gem identification and characterization.

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