H. Sowa, H. Klein and R. Nowak
1 GZG, Dept. of Crystallography, University of Göttingen, Goldschmidtstr.1, 37077 Göttingen, Germany
1HASYLAB at DESY, Notkestrasse 85, 22603 Hamburg, Germany
Abstract
NiS is dimorph. The stable phase at room temperature is millerit β-NiS that crystallizes with the rhombohedral space group R3m with a = 9.6112(6) Ă…, c = 3.1508(5) Ă… [1]. Above 379 °C α-NiS [2] is stable that belongs to the NiAs structure type. This hexagonal phase, space group P63/mmc, can be quenched to room temperature. The lattice parameters are a = 3.4395(2) Ă…, c = 5.3514(7) Ă… [3]. The α- to β-NiS transition is accompanied by an increase of the volume by about 2.8%. This transition often causes the shattering of toughened glass panes since NiS occurs as an impurity in the process of float glass formation [4].
To download the article click on the link below:
http://hasyweb.desy.de/science/annual_reports/2007_report/part1/contrib/42/20575.pdf
1 GZG, Dept. of Crystallography, University of Göttingen, Goldschmidtstr.1, 37077 Göttingen, Germany
1HASYLAB at DESY, Notkestrasse 85, 22603 Hamburg, Germany
Abstract
NiS is dimorph. The stable phase at room temperature is millerit β-NiS that crystallizes with the rhombohedral space group R3m with a = 9.6112(6) Ă…, c = 3.1508(5) Ă… [1]. Above 379 °C α-NiS [2] is stable that belongs to the NiAs structure type. This hexagonal phase, space group P63/mmc, can be quenched to room temperature. The lattice parameters are a = 3.4395(2) Ă…, c = 5.3514(7) Ă… [3]. The α- to β-NiS transition is accompanied by an increase of the volume by about 2.8%. This transition often causes the shattering of toughened glass panes since NiS occurs as an impurity in the process of float glass formation [4].
To download the article click on the link below:
http://hasyweb.desy.de/science/annual_reports/2007_report/part1/contrib/42/20575.pdf
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