Crystal structure, vibrational properties and luminescence of NaMg{sub 3}Al(MoO{sub 4}){sub 5} crystal doped with Cr{sup 3+} ions
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw 2 (Poland)
Crystals of NaMg{sub 3}Al(MoO{sub 4}){sub 5} doped with 0.5% Cr{sup 3+} ions have been synthesized and characterized by a single-crystal X-ray structure analysis and IR, Raman, electron absorption and luminescence spectroscopic studies. It has been shown that NaMg{sub 3}Al(MoO{sub 4}){sub 5} crystallizes in the P1-bar structure, with a=6.8744(8) A, b=6.9342(7) A, c=17.605(2) A, {alpha}=87.788(8){sup o}, {beta}=87.727(9){sup o}, {gamma}=78.501(9){sup o}, Z=2. The characteristic feature of the structure is its enormously large thermal displacement parameter for sodium, even at 105K. The IR and Raman spectra indicate significant interactions between the MoO{sub 4}{sup 2-} ions in the structure. The electron absorption, excitation and luminescence studies have shown that there are at least two different sites of incorporated Cr{sup 3+} ions in the NaMg{sub 3}Al(MoO{sub 4}){sub 5} crystal structure. They differ themselves by strength of crystalline field. One of them is characterized by Cr{sup 3+} in low ligand field and {sup 4}T{sub 2}->{sup 4}A{sub 2} emission whereas the second is characterized by higher strength of the crystal field and dominant {sup 2}E->{sup 4}A{sub 2} emission. Temperature-dependent studies show that the compound does not exhibit any phase transition.0.
- OSTI ID:
- 20784910
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 3; Other Information: DOI: 10.1016/j.jssc.2005.11.032; PII: S0022-4596(05)00563-3; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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