High-pressure structural study of MnF2

TY - JOUR

T1 - High-pressure structural study of MnF2

AU - Stavrou, Elissaios

AU - Yao, Yansun

AU - Goncharov, Alexander F.

AU - Konôpková, Zuzana

AU - Raptis, Constantine

N1 - Publisher Copyright: © 2016 American Physical Society.

PY - 2016/2/1

Y1 - 2016/2/1

N2 - 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).

AB - 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).

UR - http://www.scopus.com/inward/record.url?scp=84958206684&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.93.054101

DO - 10.1103/PhysRevB.93.054101

M3 - 文章

AN - SCOPUS:84958206684

SN - 2469-9950

VL - 93

JO - Physical Review B

JF - Physical Review B

IS - 5

M1 - 054101

ER -