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- W1567486085 abstract "Abstract Air and moisture sensitive K 29 Mn 17 O 34 , Rb 11 Mn 8 O 16 and Cs 4 Mn 3 O 6 were prepared via the azide/nitrate route from stoichiometric mixtures of the precursors Mn 2 O 3 , A N 3 and A NO 3 ( A = K, Rb, Cs) in special containers provided with silver inlays. Their compositions can be generalized as A x MnO 2 with x varying between 1.703 and 1.333. According to the X‐ray analysis of the crystal structures [K 29 Mn 17 O 34 : Ima 2, Z = 4, a = 93.149(3), b = 10.0063(3), c = 6.0621(2) Å, 6585 independent reflections, R 1 = 0.053, wR (all) = 0.143; Rb 11 Mn 8 O 16 : F 222, Z = 16, a = 12.2096(4), b = 20.1595(7), c = 43.712(2) Å, 11534 independent reflections, R 1 = 0.042, wR (all) = 0.131; Cs 4 Mn 3 O 6 : C 222, Z = 8, a = 12.790(3), b = 21.123(4), c = 8.179(2) Å, 2212 independent reflections, R 1 = 0.051, wR (all) = 0.122], the main feature of all three crystal structures are {}^1_infty MnO 2 n – chains built up from partially distorted edge‐sharing MnO 4 tetrahedra. The alkali metal ions fill the space between the anionic entities forming honeycomb like arrangements. In all cases manganese is in a mixed‐valent state but no full charge ordering is noticeable. The variations of the charges along the MnO 2 n – chains seem to be best described in terms of charge density waves. The magnetic susceptibilities show the dominance of strong antiferromagnetic interactions for the rubidium and the cesium compounds, whereas ferro‐ or ferrimagnetic interactions prevail in the potassium compound." @default.
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- W1567486085 date "2009-12-22" @default.
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- W1567486085 title "The Chain Manganates K<sub>29</sub>Mn<sub>17</sub>O<sub>34</sub>, Rb<sub>11</sub>Mn<sub>8</sub>O<sub>16</sub>, and Cs<sub>4</sub>Mn<sub>3</sub>O<sub>6</sub>: a New Family of Mixed-valent One-dimensional Transition Metallates" @default.
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- W1567486085 doi "https://doi.org/10.1002/zaac.200900269" @default.
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