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Incommensurate structures and radiation damage in Rb2V3O8 and K2V3O8 mixed-valence vanadate fresnoites.

Andrzej Grzechnik1, Vaclav Petříček2, Dmitry Chernyshov3

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Summary

Researchers investigated the low-temperature structures of Rb2V3O8 and K2V3O8 vanadate fresnoites. K2V3O8 exhibits a modulated structure, while Rb2V3O8 shows no observed phase transition, with synchrotron radiation effects discussed.

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incommensurate structuresradiation damagesingle-crystal diffractionsynchrotron radiation

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Area of Science:

  • Solid State Chemistry
  • Crystallography
  • Materials Science

Background:

  • Mixed-valence vanadate fresnoites, specifically Rb2V3O8 and K2V3O8, are known for complex structural behaviors.
  • Understanding their phase transitions is crucial for materials science applications.

Purpose of the Study:

  • To investigate the low-temperature structures and phase transitions of Rb2V3O8 and K2V3O8.
  • To characterize the modulated structure of K2V3O8 and explore phase transitions in Rb2V3O8.

Main Methods:

  • Synchrotron single-crystal diffraction at low temperatures and ambient pressure.
  • Analysis of modulated structures using multi-dimensional superspace groups.
  • Investigation of synchrotron radiation effects on crystal structures.

Main Results:

  • K2V3O8 exhibits a modulated structure below 115 K, best described in (3+2)-dimensional space, with rigid VO4 and VO5 units.
  • The modulation in K2V3O8 primarily involves slight rotations of polyhedra and variations in K-O distances.
  • The previously reported phase transition in Rb2V3O8 at 270 K was not observed, potentially due to intense synchrotron radiation effects.

Conclusions:

  • The study provides detailed structural insights into K2V3O8 and challenges previous findings for Rb2V3O8.
  • Synchrotron radiation can significantly influence or suppress incommensurate phases, necessitating careful experimental strategies.
  • Recommendations are made for collecting and analyzing diffraction data under intense synchrotron radiation.