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首页> 外文期刊>Crystallography reports >Behavior of ammonium ion in beta-LiRb1-x(NH4)(x)SO4 mixed crystals (0.5 <= x <= 1.0)
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Behavior of ammonium ion in beta-LiRb1-x(NH4)(x)SO4 mixed crystals (0.5 <= x <= 1.0)

机译：铵离子在β-LiRb1-x（NH4）（x）SO4混合晶体中的行为（0.5 <= x <= 1.0）

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摘要

The influence of replacement of an ammonium ion by rubidium on the x-T phase diagram in the concentration range 0.50 <= x <= 1.0 has been studied by X-ray and neutron powder diffraction over a wide temperature range. It is shown that a decrease in the ammonium concentration is accompanied by an increase in the temperature of the II double left right arrow I phase transition and stabilization of phase II up to low temperatures (20 K). The changes occurring in the dynamics of mixed crystals are studied by inelastic incoherent neutron scattering. The spectra of the generalized vibrational density of states obtained allowed one to establish the difference in the phonon modes corresponding to phase III of beta-LiNH4SO4 and phase II of beta-LiRb1-x(NH4)(x)SO4 mixed crystal with x = 0.91 and x = 0.77 at 20 K. It is shown that a mixed crystal with x = 0.77 at 20 K is in the orientational glass state. (c) 2005 Pleiades Publishing, Inc.
机译：通过X射线和中子粉末衍射在较宽的温度范围内研究了rub在0.50 <= x <= 1.0浓度范围内用rub替代铵离子对x-T相图的影响。结果表明，铵浓度的降低伴随着II双左向右箭头I相变温度的升高和直到低温（20 K）的II相的稳定。通过非弹性非相干中子散射研究了混合晶体动力学中发生的变化。所获得的广义状态振动密度谱使人们能够确定与β-LiNH4SO4相III和β-LiRb1-x（NH4）（x）SO4混合晶体的II相对应的声子模式的x = 0.91并且在20K下x ＝ 0.77。表明在20K下x ＝ 0.77的混合晶体处于取向玻璃状态。 （c）2005年Pleiades Publishing，Inc.

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