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首页> 外文期刊>Zeitschrift fur Naturforschung. A, A journal of physical sciences >Creation and Recombination of Frenkel Defects in AgBr
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Creation and Recombination of Frenkel Defects in AgBr

机译：AgBr中Frenkel缺陷的产生和重组

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摘要

Complete ionic conductivity spectra as well as quasielastic and inelastic neutron scattering spectra have been taken of solid silver bromide at various temperatures. High-amplitude vibrational movements, essentially of the silver ions, contribute to both kinds of spectra. In particular, a conductivity maximum, located at about 500 GHz, reflects oscillations of individual silver ions along < 111 > directions. - The microwave and millimetre-wave conductivities are dominated by a thermally activated Debye-type relaxation process. The effect is consistently explained by the frequent hopping of silver ions from regular octahedral lattice sites into tetrahedral interstitial sites and back again, i.e., by the frequent creation and recombination of Frenkel pairs. - The effect is also responsible for the existence of thermally activated quasielastic components in the neutron scattering spectra. The width of the coherent quasielastic scattering shows that the forward-backward hopping of a silver ion is accompanied by fast correlated movements of ions in its immediate neighbourhood.
机译：固态溴化银在不同温度下已获得完整的离子电导率光谱以及准弹性和非弹性中子散射光谱。基本上是银离子的高振幅振动运动对两种光谱都有贡献。特别地，位于约500 GHz处的最大电导率反映了各个银离子沿<111>方向的振荡。 -微波和毫米波电导率由热激活的德拜型弛豫过程控制。银离子从规则的八面体晶格位置频繁跳入四面体间隙位置并再次返回，即通过弗伦克尔对的频繁产生和重组，始终可以解释这种效果。 -该效应还导致中子散射光谱中存在热活化的准弹性成分。相干准弹性散射的宽度表明，银离子的前后跳动伴随着离子在其紧邻区域的快速相关运动。

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