Preparation, crystal structure and photoluminescence of lithium magnesium manganese borate solid solutions, LiMg1-xMnxBO3

Hisanori Yamane, Tetsuya Kawano, Kentaro Fukuda, Takayuki Suehiro, Tsugio Sato

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

LiMg1-xMnxBO3 solid solutions were prepared by solid state reaction in Ar at 800 °C. The X-ray diffraction reflections of the solid solutions with the manganese content x from 0 to 0.5 were indexed with monoclinic cells (space group C2/c (No. 15)). The solid solution of x = 0.75 has the hexagonal structure of LiMnBO3 (space group P6 (No. 174)). Colorless transparent platelet single crystals of LiMg 0.5Mn0.5BO3 were prepared by heating a polycrystalline sample of x = 0.50 with a Li2BO2 flux and by slow cooling from 900 °C. The crystal structure was analyzed by single crystal X-ray diffraction (monoclinic, C2/c, a = 5.1820(2) , b = 8.9241(4) , c = 10.1529(6) , β = 91.5824(18)°, R1 = 0.0271, wR2 = 0.0645, and S = 1.219 for all data). Mn2+ and Mg2+ atoms statistically occupy a 5-fold coordinate site of oxygen trigonal bipyramid. Monoclinic LiMg1-xMnxBO3 solid solutions emit red light with a peak wavelength λem = 682-696 nm due to d-d transition under visible light of 428 nm at room temperature. The radiation lifetimes decreased from 24 ms to 0.3 ms with increasing x from 0.02 to 0.30. Stronger red emission of 698 nm was observed for the sample of x = 0.10 by excitation of ultraviolet light λex = 200 nm.

Original languageEnglish
Pages (from-to)223-229
Number of pages7
JournalJournal of Alloys and Compounds
Volume512
Issue number1
DOIs
Publication statusPublished - 2012 Jan 25

Keywords

  • Crystal growth
  • Crystal structure
  • Luminescence
  • Nuclear reactor materials
  • Optical materials
  • Oxide materials
  • Solid state reaction
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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