Moessbauer studies of Sr{sub 2}FeO{sub 4} to pressures of 20 GPa

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The transport and magnetic properties of the antiferromagnetic semiconductor Sr{sub 2}FeO{sub 4} (Fe{sup 4+}, d{sup 4}) were probed by resistance studies and {sup 57}Fe Moessbauer spectroscopy to 20 GPa using a diamond-anvil cell. The main conclusions of this work are that beyond the onset of the semiconductor-metal transition at {approx}17(1) GPa determined in the resistance studies: (1) the compound is still magnetic and, (2) there is no charge disproportionation of the form: 2Fe{sup 4+} {yields} Fe{sup 3+} + Fe{sup 5+}. The quadrupole splitting ({delta}E{sub Q}) at room temperature (RT) decreases from 0.42 mm/s at ambient pressure to a minimum of ... continued below

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Hearne, G. R.; Pasternak, M. P. & Rozenberg, G. September 1995.

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The transport and magnetic properties of the antiferromagnetic semiconductor Sr{sub 2}FeO{sub 4} (Fe{sup 4+}, d{sup 4}) were probed by resistance studies and {sup 57}Fe Moessbauer spectroscopy to 20 GPa using a diamond-anvil cell. The main conclusions of this work are that beyond the onset of the semiconductor-metal transition at {approx}17(1) GPa determined in the resistance studies: (1) the compound is still magnetic and, (2) there is no charge disproportionation of the form: 2Fe{sup 4+} {yields} Fe{sup 3+} + Fe{sup 5+}. The quadrupole splitting ({delta}E{sub Q}) at room temperature (RT) decreases from 0.42 mm/s at ambient pressure to a minimum of 2.2 mm/s at {approx}5.5 GPa. Beyond 5.5 GPa {delta}E{sub Q} at RT increases monotonically reaching 0.5 mm/s at 20 GPa. In the 0-10 GPa pressure range the Neel temperature T{sub N}, is pinned at 60-70 K reaching values of 135(5) K at 19 GPa where the compound is metallic. At 19 GPa and T {much_lt} T{sub N} a simplified magnetic spectrum having an internal magnetic field of {approx}25 T and a substantial quadrupole interaction is obtained.

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5 p.

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OSTI as DE95016872

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  • 5. international conference on the applications of the Moessbauer effect (ICAME), Rimini (Italy), 10-16 Sep 1995

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  • Other: DE95016872
  • Report No.: LA-UR--95-2120
  • Report No.: CONF-950948--2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 102400
  • Archival Resource Key: ark:/67531/metadc624066

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  • September 1995

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 8, 2016, 8:11 p.m.

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Hearne, G. R.; Pasternak, M. P. & Rozenberg, G. Moessbauer studies of Sr{sub 2}FeO{sub 4} to pressures of 20 GPa, article, September 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc624066/: accessed June 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.