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Title: High-pressure structural study of MnF2

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [5]
  1. Carnegie Institute of Washington, Washington, DC (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Saskatchewan, Saskatoon, SK (Canada); Canadian Light Sources, Inc., Saskatoon, SK (Canada)
  3. Carnegie Institute of Washington, Washington, DC (United States); Chinese Academy of Sciences (CAS), Hefei (China)
  4. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  5. National Technical Univ. of Athens, Athens (Greece)

In this study, manganese fluoride (MnF2) with the tetragonal rutile-type structure has been studied using a synchrotron angle-dispersive powder x-ray diffraction and Raman spectroscopy in a diamond anvil cell up to 60 GPa at room temperature combined with first-principles density functional calculations. The experimental data reveal two pressure-induced structural phase transitions with the following sequence: rutile → SrI2 type (3 GPa)→ α–PbCl2 type (13 GPa). Complete structural information, including interatomic distances, has been determined in the case of MnF2 including the exact structure of the debated first high-pressure phase. First-principles density functional calculations confirm this phase transition sequence, and the two calculated transition pressures are in excellent agreement with the experiment. Lattice dynamics calculations also reproduce the experimental Raman spectra measured for the ambient and high-pressure phases. The results are discussed in line with the possible practical use of rutile-type fluorides in general and specifically MnF2 as a model compound to reveal the HP structural behavior of rutile-type SiO2 (Stishovite).

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1248280
Alternate ID(s):
OSTI ID: 1236529
Report Number(s):
LLNL-JRNL-678301; PRBMDO
Journal Information:
Physical Review B, Vol. 93, Issue 5; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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