The EPR study of Mn2+ ion doped KBr and VO2+ ion doped KH2PO4 under high pressure

Ceylan U., Tapramaz R.

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, vol.152, pp.654-657, 2016 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 152
  • Publication Date: 2016
  • Doi Number: 10.1016/j.saa.2015.02.019
  • Journal Name: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.654-657
  • Keywords: High-pressure reactor, EPR, UV-Vis, Argon atmosphere, Oxygen atmosphere, ELECTRON-SPIN-RESONANCE, PHASE-TRANSITIONS, MIXED-CRYSTALS, X-RAY, OPTICAL-ABSORPTION, GROWTH, CU2+, AUTOCLAVE, THERMOLUMINESCENCE, SPECTRA
  • Ondokuz Mayıs University Affiliated: Yes

Abstract

In previous works under open atmosphere at various temperatures KBr host crystal never accepted paramagnetic Mn2+ ion in its lattice, but KH2PO4 host crystal accepted VO2+ ion in its lattice where K+ ion substituted with VO2+. In a series of works using high-pressure reactor at various pressures and temperatures under different gas atmospheres, Mn2+ ion was inserted in KBr host, and VO2+ ion was inserted in KH2PO4 host in sites different from those observed in previous works. The best results were obtained for Mn2+ doped KBr at pressure of 100 bars and 50 degrees C under Argon atmosphere, and for VO2+ doped KH2PO4 at pressure of 100 bars and temperature of 50 degrees C under oxygen atmosphere. The structural parameters of paramagnetic species formed were determined by EPR spectroscopy and optical transitions were determined by UV-Vis spectroscopy. (C) 2015 Elsevier B.V. All rights reserved.