Nanoscale ice-type structural fluctuation in spinel titanates

In the spinel titanate MgTi2O4, the tetragonal phase collapses upon substitution of a tiny amount of Mg ions at the Ti site, and the cubic phase with the geometrical frustration is resurrected. The atomic pair distribution function (PDF) and the extended x-ray absorption fine structure (EXAFS) revea...

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Bibliographic Details
Published in:Physical review. B 2018-10, Vol.98 (13), p.134443
Main Authors: Torigoe, S, Hattori, T, Kodama, K, Honda, T, Sagayama, H, Ikeda, K, Otomo, T, Nitani, H, Abe, H, Murakawa, H, Sakai, H, Hanasaki, N
Format: Article
Language:English
Subjects:
Distribution functions
Fine structure
Spinel
Titanates
Variation
X ray absorption
Online Access:Get full text
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Summary:In the spinel titanate MgTi2O4, the tetragonal phase collapses upon substitution of a tiny amount of Mg ions at the Ti site, and the cubic phase with the geometrical frustration is resurrected. The atomic pair distribution function (PDF) and the extended x-ray absorption fine structure (EXAFS) reveal the nanoscale structural fluctuation, in which the Ti atomic displacement has the two-in two-out configuration in the cubic phase. We argue that the geometrical frustration plays an essential role in the collapse of the tetragonal phase and the resultant nanoscale ice-type structural fluctuation.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.134443