Twin solution calorimeter determines heats of formation of alloys at high temperatures

Calvert-type, twin liquid metal solution calorimeter determines the heats of formation of transition metal alloys at high temperatures. The twin differential calorimeter measures the small heat effects generated over extended periods of time, has maximum operating temperature of 1073 degrees K and an automatic data recording system

Ralph Leroy Menzies v. Hank Galetka : Reply Brief of Cross-Appellant

This is the reply brief of Cross-Appellant in a capital post-conviction case presided over by the Honorable Pat B. Brian, Judge of the Third District Court, West Valley Department, Salt Lake County, State of Utah

THERMOCHEMISTRY OF FORSTERITE-FAYALITE OLIVINE SOLUTIONS

The enthalpies of solution of synthetic Mg2SiO4-Fe2SiO4 olivine solid solutions have been measured in Pb2B2O5 melt at 970 K. The heat of solution of forsterite was found to be 15.62 ± 0.3 kcal mol-1 and that of fayalite 9.39 ± 0.14 kcal mol-1. Solid solutions between these end-members exhibit small positive deviations from mixing ideality, asymmetric towards the Fe end-member. In terms of the sub-regular solution model, excess enthalpies of intermediate olivine are adequately represented by the equation Hxs = 2(1000 + 1000XFe) XFeXMg. The enthalpies of solution at 970 K are consistent with high temperature phase equilibrium measurements of activity-composition relationships in the olivine series. Excess entropy terms are not needed to relate the phase equilibrium data to the calorimetric data presented here. The enthalpy of solution of FeSiO3 ferrosilite at 970 K was found to be 4.36 ± 0.10 kcal mol-1. This value, when taken together with calorimetric measurements on fayalite and quartz, is consistent with phase equilibrium investigations of the reaction: 2FeSiO3 = Fe2SiO4 + SiO2 Ferrosilite Fayalite Quartz. These provide a check on the internal consistency of the calorimetric data presented here. © 1981

CHROMIUM-ALUMINUM MIXING IN GARNET - A THERMOCHEMICAL STUDY

The enthalpies of mixing of synthetic grossular (Ca3Al2Si3O12)-uvarovite (Ca3Cr2Si3O12) solid solutions have been determined by oxide melt calorimetry at 970 K. The results indicate that the solid solution exhibits a very small negative deviation from Raoult's law. In terms of the regular solution model a chromium-aluminum interaction parameter WHCr-Al of between 0 and -1000 cal/gm atom is consistent with the data. © 1984

THERMOCHEMISTRY OF SILICATE SOLID-SOLUTIONS

Brief reviews are given of relations on the three clinopyroxene joins of diopside with jadeite, Ca Tschermak's molecule, and clinoenstatite; HF solution data for the alkali feldspars, plagioclase, olivine, and melilite; and the grossular-pyrope join.-R.A.H