Document Detail


High-pressure phase transition of Bi(2)Fe(4)O(9).
MedLine Citation:
PMID:  22422362     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The high-pressure behaviour of Bi(2)Fe(4)O(9) was analysed by in situ powder and single-crystal x-ray diffraction and Raman spectroscopy. Pressures up to 34.3(8) GPa were generated using the diamond anvil cell technique. A reversible phase transition is observed at approximately 6.89(6) GPa and the high-pressure structure is stable up to 26.3(1) GPa. At higher pressures the onset of amorphization is observed. The crystal structures were refined from single-crystal data at ambient pressure and pressures of 4.49(2), 6.46(2), 7.26(2) and 9.4(1) GPa. The high-pressure structure is isotypic to the high-pressure structure of Bi(2)Ga(4)O(9). The lower phase transition pressure of Bi(2)Fe(4)O(9) with respect to that of Bi(2)Ga(4)O(9) (16 GPa) confirms the previously proposed strong influence of cation substitution on the high-pressure stability and the misfit of Ga(3+) and Fe(3+) in tetrahedral coordination at high pressure. A fit of a second-order Birch-Murnaghan equation of state to the p-V data results in K(0) = 74(3) GPa for the low-pressure phase and K(0) = 79(2) GPa for the high-pressure phase. The mode Grüneisen parameters were obtained from Raman-spectroscopic measurements.
Authors:
Alexandra Friedrich; Jasmin Biehler; Wolfgang Morgenroth; Leonore Wiehl; Björn Winkler; Michael Hanfland; Martin Tolkiehn; Manfred Burianek; Manfred Mühlberg
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-16
Journal Detail:
Title:  Journal of physics. Condensed matter : an Institute of Physics journal     Volume:  24     ISSN:  1361-648X     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101165248     Medline TA:  J Phys Condens Matter     Country:  -    
Other Details:
Languages:  ENG     Pagination:  145401     Citation Subset:  -    
Affiliation:
Institut für Geowissenschaften, Abteilung Kristallographie, Goethe-Universität Frankfurt, Altenhöferallee 1, D-60438 Frankfurt am Main, Germany.
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