NON-ISOTHERMAL STUDIES OF CHEMICAL AND PHYSICAL REACTIONS. PART I. KNUDSEN CELL VAPORIZATION OF SILVER AND BORON NITRIDE.
Abstract
A technique was devised for studying non-isothermal changes in properties or compositions. The required data in this technique are the total change in property or composition, the temperature-time behavior, and either some assumptions about the temperature behavior of the system or the expression for the rate of change of a property or the composition. The technique was tested by applying it to two different evaporating systems whose products of evaporation effused through a Knudsen cell orifice. For example, the vapor pressures, P, of silver and boron nitride were determined as a function of temperature, T, both isothermally and non-isothermally. The technique is especially applicable in studying decomposing systems in a mass spectrometer, where the relative concentration of the species being evaporated as a function of time and temperature can be followed. The treatment of data can be adapted to the direct calculation of mass loss, changes in properties of systems, and/or changes in composition of various systems, such as ablating systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1968
- Accession Number
- AD0670827
Entities
People
- Emile Rutner
- Gerard L. Haury
Organizations
- Air Force Research Laboratory