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- W2281661501 abstract "The coefficients of silicon and germanium linear expansion become negative below 120 and 48 deg K, respectively. Studies were made of the thermal expansion of alpha Sn which crystallizes into a diamond structure simmilar to that of silicon and germanium. The coefficient of alpha Sn linear expansion at temperatures of -130 to 25 deg C was approx equal 0.50 x 10/sup -5/ degree/sup - 1/. The presence of small amounts of beta Sn reduced the absolute value of the negative alpha value. The ratio alpha = f(T) for Si, Ge, and alpha Sn is plotted. The alpha transition temperatare decreases from Si to alpha Sn. The Si, Ge, and alpha Sn crystals are covalent. The influence of the bond on the abnormal behavior of the expansion coefficients in relation to temperature was studied with crystals of the isoelectron compounds alpha Sn, InSb, and CdTe. A small ionic admixture to the covalent bonds was found in InSb and an increasing amount CdTe. Correlation of the alpha = f(T) curves for alpha Sn, InSb, and CdTe shows that with an ionic component in the bond force, the temperature of the alpha transition to negative values is increased and the absolute magnitude becomesmore » larger: thus it is shown that the region of negative expansion coefficient is present in series of elements and compounds with diamond lattices. (R.V.J.)« less" @default.
- W2281661501 created "2016-06-24" @default.
- W2281661501 creator A5090044128 @default.
- W2281661501 date "1960-09-01" @default.
- W2281661501 modified "2023-09-24" @default.
- W2281661501 title "INVESTIGATION OF HEAT EXPANSION OF /cap alpha/-Sn, InSb, CdTe" @default.
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