Nonstoichiometric pyrrhotites heat capacity

摘要

To present day are staying undefined suppositions about pyrrhotites heat capacity values at low-temperature phase transitions. In this work was established in Curie point the value of synthetic pyrrhotites heat capacity depending on sulfur contention (from 53.05 before 53.27) and decrease from 73.42 before 73.30 J/mole·°C at 320 - 303°C. Heat capacity of Fe_(0.885)S and Fe_0.888S at 294 - 293°C consist 39.99 and 39.92 J/mole·°C accordingly. Heat capacity of pyrrhotites Fe_(0.885)S - Fe_(0.888)S is not depend from structure and equal at 550°C 73.30 J/mole·°C. Results were got by calorimeter STA PC/PG Luxx NETZSCH Company. Initial materials were subjected by chemical. thermogravimetric. Mossbauer researching and X-ray analysis.