%0 Journal Article
%A Grzechnik, A.
%A Ueda, Y.
%A Yamauchi, T.
%A Hanfland, M.
%A Hering, P.
%A Potapkin, V.
%A Friese, K.
%T Structural stability of the Wadsley-type bronzes β − Ag $_{0.33}$ V $_{2}$ O $_{5}$ and β − Li $_{0.33}$ V $_{2}$ O $_{5}$ on compression: A breakdown of the two-leg ladder system in the nonsuperconducting high-pressure phase of β − Li $_{0.33}$ V $_{2}$ O $_{5}$
%J Physical review / B
%V 91
%N 17
%@ 1098-0121
%C College Park, Md.
%I APS
%M FZJ-2015-04671
%P 174113
%D 2015
%X Structural stabilities of the Wadsley-type bronzes β−Ag0.33V2O5 and β−Li0.33V2O5 (both C2/m, Z = 6) have been studied with single-crystal x-ray diffraction in diamond anvil cells at room temperature to 8 and 13 GPa, respectively. β−Ag0.33V2O5 is stable at least to 8 GPa. β−Li0.33V2O5 undergoes two phase transitions at about 9 and 11 GPa due to relative displacements of the adjacent octahedral vanadate layers. In the intermediate phase between 9 and 11 GPa, very strong one-dimensional diffuse scattering is observed, indicating the presence of stacking faults. The structural refinements (C2/m, Z = 6) of the data above 11 GPa reveal that the layers of VO6 octahedra remain essentially intact. However, the relative position of the chains of edge-sharing VO5 tetragonal pyramids with respect to the octahedral layers is changed. As a result, the tunnels populated by the Li1+ cations collapse on compression. The distribution of the Li1+ cations in the vanadate framework is fully ordered in the polymorph above 11 GPa. The present structural data could be used to better understand the pressure-induced superconductivity in all the Wadsley-type bronzes β−A0.33V2O5 (A = Li, Na, Ag).
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000355088800001
%R 10.1103/PhysRevB.91.174113
%U https://juser.fz-juelich.de/record/202457