A geometrical model for mixed cyanide crystals
نویسندگان
چکیده
منابع مشابه
Mixed cyanide crystals
A model of diluted random field sustained by quenched volume deformations is shown to reproduce puzzling physical features found in X(CN)xY1−x mixed cyanide crystals. X is an alkali metal (K, Na or Rb) and Y is a spherical halogen ion (Br, Cl or I). Critical thresholds xc at which associated first order ferroelastic transitions disappear are calculated exactly. The diluted random field is shown...
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A percolation argument and a dilute compressible random field Ising model are used to present a simple model for mixed cyanide crystals. The model reproduces quantitatively several features of the phase diagrams altough some crude approximations are made. In particular critical thresholds xc at which ferroelastic first order transitions disappear, are calculated. Moreover, transitions are found...
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Optical absorption spectra of KBr:Tl + (0.01mol%) single crystals shows A, B and C bands around 258, 220 and 210nm respectively. An additional absorption bands are observed in KBr-KI: Eu 2+ , Tl + (0.05, 0.01mol %) mixed crystals. These additional absorption spectra are attributed to the presence of Eu 2+ aggregates and complex centers involving both Eu 2+ and Tl + ions. Inclusion of Tl + ions ...
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Phytoremediation counts as a major method for future which essentially needs resistance to contaminating agents. We pretreated the plants (Salix babylonica, as a model plant in phytoremediation of polluted waters) by sodium cyanide (0, 3 and 5 mg CN- L-1) to induce resistance with regard to acclimation and then examined their resistance to higher concentrations of cyanide. Accordingly, some of ...
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ژورنال
عنوان ژورنال: Journal of Non-Crystalline Solids
سال: 1998
ISSN: 0022-3093
DOI: 10.1016/s0022-3093(98)00611-5