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Neutron studies of the structure and dynamics of Rb1-x(NH4)(x)I mixed crystals

机译:Rb1-x(NH4)(x)I混合晶体的结构和动力学的中子研究

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The structural and dynamical properties of the x-T phase diagram of the system of Rb-1 (-) (x)(NH4)(x)I mixed crystals is of great interest, because such solid solutions are almost free of internal stresses due to almost equal ionic radii of ammonium and rubidium. The x-T phase diagram of Rb-1 (-) (X)(NH4)(X)I is studied on samples with ammonium concentration ranging from 0.01 to 0.73 over the temperature range from 15 to 300 K by the methods of powder neutron diffraction and inelastic incoherent neutron scattering. The results obtained by powder neutron diffraction show that the alpha-beta phase transition at low temperature is rather extended and occurs at the ammonium concentrations x = 0.50 and 0.66. The region of orientational state glass is determined by inelastic incoherent neutron scattering at the concentrations x = 0.29 and 0.40 at the temperature T = 20 K. (C) 2004 MAIK "Nauka/Interperiodica".
机译:Rb-1(-)(x)(NH4)(x)I混合晶体体系的xT相图的结构和动力学性质引起人们极大的兴趣,因为这种固溶体几乎没有内应力,因为铵和rub的离子半径相等。利用粉末中子衍射法和粉末中子衍射法研究了在15至300 K温度范围内铵浓度为0.01至0.73的样品上Rb-1(-)(X)(NH4)(X)I的xT相图。非弹性非相干中子散射。通过粉末中子衍射获得的结果表明,低温下的α-β相变相当大,并在铵浓度x = 0.50和0.66时发生。取向状态玻璃的区域由温度T = 20 K时浓度为x = 0.29和0.40的非弹性非相干中子散射确定。(C)2004 MAIK“ Nauka / Interperiodica”。

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