Recognition of Solid Solutions

Aston, J. G.; Cines, M. R.; Fink, H. L.

doi:10.1021/ja01198a502

Cited by 14 publications

(2 citation statements)

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“…The apparent heat capacity of a sample just below the melting point is always greater than the true heat capacity of the solid phase because of incipient melting. This apparent increase in the heat capacity has been used as a basis for calculating the purity (2,10). This method is considered to be superior for determining the purity of very pure samples because of greater sensitivity.…”

Section: Theorymentioning

confidence: 99%

Calorimetric Determination of Purity: Design and Operation of a Small Adiabatic Calorimeter

Tunnicliff¹,

Stone²

1955

Anal. Chem.

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An adiabatic calorimeter has been developed for determination of the purity of the reference compounds required for spectroscopic investigations. Two interchangeable calorimeters with volumes of 0.5 and 5 ml. are used. A complete determination, including calculations, usually requires less than 4 hours. Although the purity determination is based on the measurement of the melting point depression, this method, unlike conventional melting point methods, does not require a previous determination of the heat of fusion and the melting point of the pure compound. Instead, the method determines these quantities as part of the analysis. The calorimeter is used to measure the equilibrium temperature of the sample as a function of heat input as it passes from the solid state to the liquid state.

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Section: Theorymentioning

confidence: 99%

Calorimetric Determination of Purity: Design and Operation of a Small Adiabatic Calorimeter

Tunnicliff¹,

Stone²

1955

Anal. Chem.

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show abstract

“…A further advantage of the calorimetric determinations of purity over the freezing-point determinations of purity is that it is possible to detect solid solution simultaneously with the purity determination by comparing the impurity calculated from premelting heat capacities with that calculated from the fusion temperatures. This method has been described by Aston, Cines, and Fink (8).…”

Section: Melting Pointmentioning

confidence: 99%