alpha-beta phase re-transformation kinetics in nickel sulphide

Citation
Dw. Bishop et al., alpha-beta phase re-transformation kinetics in nickel sulphide, J THERM ANA, 56(1), 1999, pp. 429-435
Citations number
4
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
ISSN journal
13886150 → ACNP
Volume
56
Issue
1
Year of publication
1999
Pages
429 - 435
Database
ISI
SICI code
1388-6150(1999)56:1<429:APRKIN>2.0.ZU;2-V
Abstract
Nickel sulphide (NiS) was characterised using X-ray diffraction, thermal gr avimetric analysis (TG) and differential scanning calorimetry (DSC). The 'a s received' Millerite, stoichiometric NiS, observed to be slightly nickel d eficient, was found to readily decompose in a nitrogen atmosphere at elevat ed temperatures (450 degrees C max.) to the sulphur deficient Godlevskite, Ni7S6. DSC and X-ray measurements demonstrated that the high temperature fo rm of the Godlevskite was readily stabilised at room temperature. The kinet ics of the alpha-beta re-transformation in Godlevskite were then investigat ed using DSC and were observed to be first order.