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- W3157286367 abstract "A series of pressure-induced phase transitions between [MHy]Mn(H2POO)3 (MHy+ = methylhydrazinium) phases reveals the structural mechanism behind the elastic properties of this hypophosphite perovskite. In the ambient pressure phase α, NH···O hydrogen bonds to H2POO– linkers stabilize the MHy+ cations outside the perovskite cages. When pressure increases to 1.1 GPa, the MHy+ cations are pushed into the perovskite cages, but the manganese-hypophosphite framework of this new phase β is similar to that of the phase α. This type of phase transition was not reported for related formate perovskites. Another phase transition to phase γ is observed at 1.2 GPa. This phase transition leads to collapse of the perovskite cages, but the conformation and positions of MHy+ cations in the cages hardly change. The phase transitions are equitranslational (zellengleichen), with the symmetry space group changing from Pnma (phase α), Pcmn (phase β), and P1121/n (phase γ). The space group type of phases α and β is the same, but the crystal directions [x] and [z] are exchanged. Owing to the hierarchy of interactions, the sequence of volume drops is rather unusual: it is smaller for the lower-pressure phase transition from phase α to β than for the subsequent phase transition to phase γ. Raman data give evidence for yet another transformation to phase δ between 4.2 and 4.7 GPa. Crystal structure of this phase could not be solved, but very pronounced changes in the Raman spectra indicate that the phase transition to phase δ is associated with very large reconstruction of the manganese-hypophosphite framework." @default.
- W3157286367 created "2021-05-10" @default.
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- W3157286367 date "2021-04-29" @default.
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- W3157286367 title "Mechanism of Pressure-Induced Phase Transitions and Structure–Property Relations in Methylhydrazinium Manganese Hypophosphite Perovskites" @default.
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- W3157286367 doi "https://doi.org/10.1021/acs.jpcc.1c01998" @default.
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