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Yamanaka, Takamitsu*; Rahman, S.*; Nakamoto, Yuki*; Hattori, Takanori; Jang, B. G.*; Kim, D. Y.*; Mao, H.-K.*
Journal of Physics and Chemistry of Solids, 167, p.110721_1 - 110721_10, 2022/08
Times Cited Count:1 Percentile:13.39(Chemistry, Multidisciplinary)High-pressure neutron diffraction proved that MnFeO
and Mn
FeO
spinels transform into CaMn
O
-type structure above 18 GPa and 14 GPa, respectively. The transition pressure of Mn
Fe
O
solutions decreases with increasing Mn content. Synchrotron X-ray M
ssbauer experiments revealed that Fe
and Fe
distribution at the tetrahedral (A) and octahedral (B) sites in the spinel structure changes with pressure. MnFe
O
and Mn
FeO
spinels are ferrimagnetic and the CaMn
O
-type phase is paramagnetic. The temperature dependence of resistivity indicates that both spinels are semiconductors wherein electrons hop between cations at the A and B sites. A pressure-induced shortening of B-B distance promoted conduction via greater electron mobility between adjacent B cations. The Fe
and Fe
occupancies at the B sites in MnFe
O
are much larger than those in Mn
FeO
. The CaMn
O
-type phase is metallic. Theoretical calculation confirmed the metallic character and Fe d-orbitals strongly renormalized compared to Mn d-orbitals.
Rahman, I. M. M.*; Begum, Z. A.*; Salehi Lisar, S. Y.*; Motafakkerazad, R.*; Awual, M. R.; Hasegawa, Hiroshi*
Arsenic; Detection, Management Strategies and Health Effects, p.117 - 129, 2014/00