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V. Balek 《无机化学与普通化学杂志》1971,380(1):82-96
Various methods for introduction of radioactive noble gases into solids are reviewed and also the diffusion of radioactive noble gases in α-iron(III)oxide, labelled by different methods. The HAHN emanation and ion bombardment methods have been used. Different noble gas diffusion processes have been shown to occur during heating the type of which is influenced by the kind of labelling conditions. The values of the activation energy of the noble gas diffusion are compared. Lattice defects including the amorphous state of FeIIIoxide are produced by ion bombardment. On the basis of the diffusion behaviour of radon, being studied by the emanation method, the “activity” of FeIII oxide prepared by heating of different iron salts and sintered at various temperatures has been estimated. It is shown that the emanation method can be used for the study of the sintering of ferric oxide. On the basis of the solid state reaction ZnO + Fe2O3 the reactivity of ferric oxide in dependence on its thermal history has been investigated. 相似文献
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About the Structure and Reactivity of Diammonium Hexafluoromanganate(IV) Electrolytic oxidation of an aqueous suspension of MnF2 containing NH4F, and subsequent crystallization in 40% HF yields yellow crystals of (NH4)2MnF6. It crystallizes in the hexagonal K2MnF6 type structure with the space group P63mc and a = 5.903; c = 9.565 Å; Z = 2. With in situ powder diffraction studies it is shown, that (NH4)2MnF6 is gradually reduced in a NH3 atmosphere between 30 and 230 °C to afford (NH4)3MnF6, (NH4)2MnF5, and finally NH4MnF3. (NH4)3MnF6, thereby, forms a hitherto unknown cubic (a = 9.082 Å) high temperature modification with the cryolite type structure. Under N2 the thermal decomposition of (NH4)2MnF6 proceeds via NH4MnF4 to yield MnF2. 相似文献
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On the Solubility of LaCl3 in Hydrochlorid Acid. Comparative Study of the Saturated Metal Chloride ? HCl? H2O Systems The results of solubility investigations in the LaCl3? HCl? H2O system at 15, 25 and 35°C were presented. On the basis of the experimental data, of references and of a model of the authors conclusions were drawn on the structure of the saturated and almost saturated solutions. 相似文献
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N-(1,3-Thiazol-5(4H)-ylidene)amines via 1,3-Dipolar Cycloaddition of Azides and 1,3-Thiazol-5(4H)-thiones Organic azides 5 and 4,4-dimethyl-2-phenyl-1,3-thiazol-5(4H)-thione ( 2 ) in toluene at 90° react to give the corresponding N-(1,3-thiazol-5(4H)-ylidene)amines (= 1,3-thiazol-5(4H)-imines) 6 in good yield (Table). A reaction mechanism for the formation of these scarcely investigated thiazole derivatives is formulated in Scheme 3: 1,3-Dipolar azide cycloaddition onto the C?S group of 2 leads to the 1:1 adduct C . Successive elimination of N2 and S yields 6 , probably via an intermediate thiaziridine E . 相似文献
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