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- W2950295004 abstract "The four title compounds, namely sodium gallium germanate, NaGaGe 2 O 6 , sodium manganese vanadate germanate, NaMnV 0.1 Ge 1.9 O 6 , sodium scandium germanate, NaScGe 2 O 6 , and sodium indium germanate, NaInGe 2 O 6 , adopt the high-temperature structure of the pyroxene-type chain germanates, with monoclinic symmetry and space group C 2/ c . The lattice parameters, the individual and average bond lengths involving M 1, and the distortion parameters scale well with the ionic radius of the M 1 cation. NaGaGe 2 O 6 has more distorted M 1 sites and more extended tetrahedral chains than NaInGe 2 O 6 , in which a high degree of kinking is required to maintain the connection between the octahedral and tetrahedral building units of the pyroxene structure. An exceptional case is NaMnGe 2 O 6 , in which the strong Jahn–Teller effect of Mn 3+ results in more distorted octahedral sites than expected according to linear extrapolation from the other Na M 3+ Ge 2 O 6 pyroxenes. In contrast with the literature, minor incorporations of V 5+ in the tetrahedral site and a corresponding reduction of Mn 3+ to Mn 2+ in the octahedral sites in the present sample lower the Jahn–Teller distortion and stabilize the Mn-bearing pyroxene, even allowing its synthesis at ambient pressure." @default.
- W2950295004 created "2019-06-27" @default.
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- W2950295004 date "2014-08-09" @default.
- W2950295004 modified "2023-10-16" @default.
- W2950295004 title "Pyroxene-type compounds Na<i>M</i><sup>3+</sup>Ge<sub>2</sub>O<sub>6</sub>, with<i>M</i>= Ga, Mn, Sc and In" @default.
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- W2950295004 doi "https://doi.org/10.1107/s2053229614017768" @default.
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