Accession Number : AD0840393

Title :   VAPORIZATION OF ALUMINUM PHOSPHIDE.

Descriptive Note : Scientific rept. 1 May 66-30 Apr 67,

Corporate Author : ROME UNIV (ITALY) ISTITUTO DI CHIMICA FISICA ED ELETTROCHIMICA

Personal Author(s) : De Maria, G. ; Gingerich, K. A. ; Piacente, V.

Report Date : JUL 1968

Pagination or Media Count : 27

Abstract : The vaporization of aluminum phosphide was investigated over the temperature range of 1270-1800K using the Knudsen effusion method in combination with mass spectrometry. Aluminum phosphide decomposes according to the reaction: (1), 2AlP(s) (yields) 2Al(g) + P2(g). The enthalpy for reaction (1), as calculated by the second and third law method is 261.7 plus or minus 5.9 kcal/mole and 254.9 plus or minus 2.1 kcal/mole respectively. The second and third law enthalpies for the reaction: (2), 4Al(g) + Al2O3(s) (yields) 3Al2O(g); were determined as -10.7 plus or minus 2.0 and -10.5 plus or minus 0.5 kcal/mole respectively. The error terms given represent the standard deviation. On the basis of a selected value of 255.0 plus or minus 6.0 kcal/mole for the enthalpy of reaction (1) and of pertinent literature data the standard heat of aluminium phosphide formation of -28.2 plus or minus 3.2 kcal/mole is obtained. (Author)

Descriptors :   (*ALUMINUM COMPOUNDS, VAPORIZATION), (*PHOSPHIDES, VAPORIZATION), SEMICONDUCTORS, THERMOCHEMISTRY, MASS SPECTROSCOPY, DECOMPOSITION, HEAT OF REACTION, ENTHALPY, HEAT OF FORMATION, ITALY.

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE