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Monoclinic SmAl3(BO3)4: synthesis, structural and spectroscopic properties.

A S Oreshonkov1, N P Shestakov1, M S Molokeev2

  • 1Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russian Federation.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|August 25, 2020
PubMed
Summary
This summary is machine-generated.

This study synthesized monoclinic Samarium Aluminum Borate (SmAl3(BO3)4) crystals, revealing their structure and luminescence properties. The findings suggest minor Sm-O bond distortion influences luminescence, with lower covalency compared to galloborates.

Keywords:
IR spectroscopyRaman spectroscopyX-ray diffractioncrystal structureluminescencemonoclinic structure

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Crystallography

Background:

  • Samarium Aluminum Borate (SmAl3(BO3)4) is a material with potential applications in optics and photonics.
  • Understanding the crystal structure and properties of different polymorphs is crucial for material design.

Purpose of the Study:

  • To synthesize single crystals of monoclinic SmAl3(BO3)4.
  • To characterize its crystal structure, purity, and spectroscopic properties.
  • To investigate the factors influencing its luminescence and compare it with related compounds.

Main Methods:

  • Group growth on seeds method for single crystal synthesis.
  • Single-crystal X-ray diffraction for structure determination.
  • Rietveld refinement for bulk material purity analysis.
  • Infrared (IR) and Raman spectroscopy for structural confirmation.
  • Luminescence spectroscopy under 532.1 nm excitation.
  • Calorimetric measurements for phase transition analysis.

Main Results:

  • Single crystals of monoclinic SmAl3(BO3)4 were successfully synthesized.
  • The crystal structure was solved, confirming the C2/c space group and providing unit-cell parameters.
  • IR and Raman spectra verified the monoclinic structure.
  • Luminescence spectra showed characteristic Sm3+ transitions from the 4G5/2 level.
  • The luminescence similarity between trigonal and monoclinic polymorphs was attributed to rotational distortion of SmO6 octahedra.
  • Lower Sm-O bond covalency was observed in alumoborates compared to galloborates.
  • No high-temperature structural phase transitions were detected up to 720 K.

Conclusions:

  • Monoclinic SmAl3(BO3)4 exhibits unique structural and luminescent characteristics.
  • Rotational distortion of SmO6 octahedra plays a key role in the luminescence properties.
  • The study provides insights into the structure-property relationships of samarium borates, aiding in the development of new optical materials.