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- W2889898286 abstract "The structures of $mathrm{Ca}{mathrm{Br}}_{2}$ have been investigated using high resolution synchrotron powder x-ray diffraction methods between room temperature and $800phantom{rule{0.2em}{0ex}}ifmmode^circelsetextdegreefi{}mathrm{C}$. At room temperature $mathrm{Ca}{mathrm{Br}}_{2}$ has an orthorhombic $mathrm{Ca}{mathrm{Cl}}_{2}$-type structure $(Pnnmphantom{rule{0.3em}{0ex}}mathrm{Z}=2)$ with $a=6.8847(1)$, $b=6.5806(1)$, and $c=4.3477(1)phantom{rule{0.3em}{0ex}}mathrm{AA{}}$. Heating above $560phantom{rule{0.2em}{0ex}}ifmmode^circelsetextdegreefi{}mathrm{C}$ results in a continuous transition to a tetragonal rutile type structure $(P{4}_{2}∕mnmphantom{rule{0.3em}{0ex}}mathrm{Z}=2)$ with $a=6.810phantom{rule{0.2em}{0ex}}95(7)phantom{rule{0.3em}{0ex}}mathrm{AA{}}$ and $c=4.417phantom{rule{0.2em}{0ex}}70(5)phantom{rule{0.3em}{0ex}}mathrm{AA{}}$ at $650phantom{rule{0.2em}{0ex}}ifmmode^circelsetextdegreefi{}mathrm{C}$. Investigation, through either spontaneous strain or octahedral tilt angle, suggests that the transition is close to second order in nature, although the contribution from the sixth order term in the Landau potential cannot be neglected." @default.
- W2889898286 created "2018-09-27" @default.
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- W2889898286 date "2004-10-07" @default.
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- W2889898286 title "Synchrotron x-ray powder diffraction study of the structural phase transition in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Ca</mml:mi><mml:msub><mml:mi mathvariant=normal>Br</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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- W2889898286 doi "https://doi.org/10.1103/physrevb.70.144102" @default.
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