Pressure-Induced Antifluorite-to-Anticotunnite Phase Transition in Lithium Oxide

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Using synchrotron angle-dispersive x-ray diffraction (ADXD) and Raman spectroscopy on samples of Li{sub 2}O pressurized in a diamond anvil cell, we observed a reversible phase change from the cubic antifluorite ({alpha}, Fm-3m) to orthorhombic anticotunnite ({beta}, Pnma) phase at 50({+-}5) GPa at ambient temperature. This transition is accompanied by a relatively large volume collapse of 5.4 ({+-}0.8)% and large hysteresis upon pressure reversal (P{sub down} at {approx} 25 GPa). Contrary to a recent study, our data suggest that the high-pressure {beta}-phase (B{sub o} = 188 {+-} 12 GPa) is substantially stiffer than the low-pressure {alpha}-phase (B{sub o} = 90 {+-} ... continued below

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Lazicki, A; Yoo, C; Evans, W J & Pickett, W E April 12, 2006.

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Using synchrotron angle-dispersive x-ray diffraction (ADXD) and Raman spectroscopy on samples of Li{sub 2}O pressurized in a diamond anvil cell, we observed a reversible phase change from the cubic antifluorite ({alpha}, Fm-3m) to orthorhombic anticotunnite ({beta}, Pnma) phase at 50({+-}5) GPa at ambient temperature. This transition is accompanied by a relatively large volume collapse of 5.4 ({+-}0.8)% and large hysteresis upon pressure reversal (P{sub down} at {approx} 25 GPa). Contrary to a recent study, our data suggest that the high-pressure {beta}-phase (B{sub o} = 188 {+-} 12 GPa) is substantially stiffer than the low-pressure {alpha}-phase (B{sub o} = 90 {+-} 1 GPa). A relatively strong and pressure-dependent preferred orientation in {beta}-Li{sub 2}O is observed. The present result is in accordance with the systematic behavior of antifluorite-to-anticotunnite phase transitions occurring in the alkali-metal sulfides.

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PDF-file: 9 pages; size: 0.8 Mbytes

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  • Journal Name: Physical Review B, vol. 73, no. 18, May 22, 2006, pp. 084120; Journal Volume: 73; Journal Issue: 18

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  • Report No.: UCRL-JRNL-220848
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 936479
  • Archival Resource Key: ark:/67531/metadc900166

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 12, 2006

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 30, 2016, 6:10 p.m.

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Lazicki, A; Yoo, C; Evans, W J & Pickett, W E. Pressure-Induced Antifluorite-to-Anticotunnite Phase Transition in Lithium Oxide, article, April 12, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc900166/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.