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High temperature mass spectrometric study of the B 2 O 3 Al 2 O 3 system at 1248–1850 K
Author(s) -
Stolyarova V. L.,
Shilov A. L.,
Ivanov G. G.,
Shultz M. M.,
Seetharaman S.
Publication year - 1995
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290091306
Subject(s) - chemistry , vaporization , sublimation (psychology) , isothermal process , boron oxide , atmospheric temperature range , enthalpy of sublimation , analytical chemistry (journal) , knudsen number , phase diagram , boron , standard enthalpy of formation , thermodynamics , phase (matter) , chromatography , psychology , physics , organic chemistry , psychotherapist
The high‐temperature mass spectrometric Knudsen effusion method has been used to study the vaporization processes and thermodynamic properties of the B 2 O 3 Al 2 O 3 system in the temperature range 1248–1850 K. Data on the B 2 O 3 partial vapour pressures and the B 2 O 3 activities in the system under consideration were obtained. The enthalpies of formation of Al 4 B 2 O 9 and Al 18 B 4 O 33 have been evaluated from the values of the enthalpies of B 2 O 3 sublimation from boron oxide and from these compounds. Comparison is made between the available phase diagram of the B 2 O 3 Al 2 O 3 system and the results obtained in the present study, using the complete isothermal vaporization method.