Synthesis, crystal structures and photoluminescence properties of new oxyborates, Mg5NbO3(BO3)3 and Mg5TaO3(BO3)3, with novel warwickite-type superstructures

Tetsuya Kawano, Hisanori Yamane

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Single crystals of new oxyborates, Mg5NbO3(BO 3)3 and Mg5TaO3(BO3) 3, were prepared at 1370 °C in air using B2O 3 as a flux. They were colorless and transparent with block shapes. X-ray diffraction analysis of the single crystals revealed Mg 5NbO3(BO3)3 and Mg 5TaO3(BO3)3 to be isostructural. The X-ray diffraction reflections were indexed to the orthorhombic Pnma (No. 62) system with a=9.3682(3) Å, b=9.4344(2) Å, c=9.3379(3) Å and Z=4 for Mg5NbO3(BO3)3 and a=9.3702(3) Å, b=9.4415(3) Å, c=9.3301(2) Å and Z=4 for Mg5TaO3(BO3)3. The crystal structures of Mg5NbO3(BO3)3 and Mg5TaO3(BO3)3 are novel warwickite-type superstructures having ordered arrangements of Mg and Nb/Ta atoms. Polycrystals of Mg5NbO3(BO3)3 prepared by solid state reaction at 1200 °C in air showed broad blue-to-green emission with a peak wavelength of 470 nm under 270 nm ultraviolet excitation at room temperature.

Original languageEnglish
Pages (from-to)2466-2471
Number of pages6
JournalJournal of Solid State Chemistry
Volume184
Issue number9
DOIs
Publication statusPublished - 2011 Sept

Keywords

  • Crystal structure analysis
  • Magnesium niobium (V) oxyborate
  • Magnesium tantalum (V) oxyborate
  • Photoluminescence
  • Synthesis
  • X-ray diffraction

Fingerprint

Dive into the research topics of 'Synthesis, crystal structures and photoluminescence properties of new oxyborates, Mg5NbO3(BO3)3 and Mg5TaO3(BO3)3, with novel warwickite-type superstructures'. Together they form a unique fingerprint.

Cite this