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- W2611463721 abstract "The crystal structures of the ferroelectric NaKo.72 (NH4)o.28 (+)-C4H406.4H20 (RSo.72ARSo.28) have been studied in the paraelectric phase [M r = 276.32, orthorhombic, P21212, ° Z = 4, F(000) = 575.04, 2(Mo Kct~) = 0.70926 A]; T = 213 (1), 253 (1) and 293 (1)K. The crystal data are as follows: (I) at T = 2 1 3 ( 1 ) K : R=0.0424 , wR=0.0399, number of reflections=3414, a 11.899(2), b = 14.273(2), c = 6.211(1)A, V = 1054.9(2)]k 3, D x = 1.740gcm-3; (II) at T = 253(1)K: R =0.0498, wR = 0.0442, number of reflections= 3284, a = 11.929(1), b = 14.297(1), c = 6.221(1)A, V = 1061.0 (2) ,4, 3, D x -1.730gcm-3; (III) at T = 2 9 3 ( 1 ) K : R=0.0473 , wR=0.0392, number of reflections=3179, a 1 1 . 9 5 5 ( 1 ) , b = 14.317(1), c = 6.231(1) A, V --1066.5 (1) A 3, Dx= 1.721gcm -3. X-ray investigations reveal details of structural change with temperature in the paraelectric phase. The carboxylate anion O(3)-C(4)-0(4) in the tartrate molecule is displaced along the a axis as the temperature decreases; moreover, the 0(8) atom is displaced in the opposite direction against the shift of the carboxylate anion. The temperature dependence of the thermal motions of 0(8) shows different behavior from the other oxygens of the water molecules. The amplitude of the thermal motion of 0(8) does not tend to zero at T = 0K, while the other oxygens of the water molecules tend to zero." @default.
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- W2611463721 date "1996-01-01" @default.
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- W2611463721 title "Temperature Dependence of Crystal Structure of NaKo 72 (NH4)o zs (+)-C4H 406.4I-I20 in the Paraeleetrie Phase" @default.
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