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- W2079177524 abstract "We explore the lattice dynamics of the negative thermal expansion material, cubic $mathrm{Hf}{mathrm{Mo}}_{2}{mathrm{O}}_{8}$, through analysis of its heat capacity (measured from $0.5phantom{rule{0.3em}{0ex}}text{to}phantom{rule{0.3em}{0ex}}300phantom{rule{0.3em}{0ex}}mathrm{K}$) and its room-temperature Raman spectrum. Its heat capacity is quantitatively very similar to that of $mathrm{Zr}{mathrm{W}}_{2}{mathrm{O}}_{8}$, as is its Raman spectrum. The heat capacity of $mathrm{Hf}{mathrm{Mo}}_{2}{mathrm{O}}_{8}$ can be well represented by the present lattice dynamical assignment and by ${C}_{P}(mathrm{Hf}{mathrm{W}}_{2}{mathrm{O}}_{8})ensuremath{-}{C}_{P}(mathrm{Zr}{mathrm{W}}_{2}{mathrm{O}}_{8})+{C}_{P}(mathrm{Zr}{mathrm{Mo}}_{2}{mathrm{O}}_{8})$, but not by ${C}_{P}(mathrm{Hf}{mathrm{O}}_{2})+2{C}_{P}(mathrm{Mo}{mathrm{O}}_{3})$, likely because the $A{B}_{2}{mathrm{O}}_{8}$ compounds have low-frequency optic modes, not present in $mathrm{Hf}{mathrm{O}}_{2}$ and $mathrm{Mo}{mathrm{O}}_{3}$. The present thermodynamic data also allow an analysis of the thermodynamic stability of cubic $mathrm{Hf}{mathrm{Mo}}_{2}{mathrm{O}}_{8}$, and it is shown to be unstable with respect to $mathrm{Mo}{mathrm{O}}_{3}$ and $mathrm{Hf}{mathrm{O}}_{2}$ at room temperature." @default.
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- W2079177524 date "2007-06-11" @default.
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- W2079177524 title "Heat capacity, lattice dynamics, and thermodynamic stability of the negative thermal expansion material<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Hf</mml:mi><mml:msub><mml:mi mathvariant=normal>Mo</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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- W2079177524 doi "https://doi.org/10.1103/physrevb.75.224302" @default.
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