Heat capacities and thermodynamic properties of braunite (Mn7 SiO12) and rhodonite (MnSiO3)
American Mineralogist
By: R. A. Robie, J.S. Huebner, and B. S. Hemingway
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Abstract
The heat capacities, C0P, of synthetic rhodonite and braunite have been measured by adiabatic calorimetry from 6 to ~350 K. The heat capacity of braunite was also measured to ~900 K by differential scanning calorimetry. Brunite exhibits a ??-peak in C0P in the temperature region 93.4-94.2 K. Rhodonite did not show the expected peak in C0P characteristic of the co-operative ordering of the Mn2+ spins at temperatures above 6 K. A revised petrogenetic grid for the system Mn-Si-O-C at 2000 bars is presented and is consistent with both thermochemical values and occurrence of natural assemblages. -from Authors
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Heat capacities and thermodynamic properties of braunite (Mn7 SiO12) and rhodonite (MnSiO3) |
| Series title | American Mineralogist |
| Volume | 80 |
| Issue | 5-6 |
| Year Published | 1995 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | American Mineralogist |
| First page | 560 |
| Last page | 575 |