ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The lattice parameters of natural spinel, ferroan gahnite, magnesiochromite, and synthetic spinel at elevated temperatures have been determined. The results are: spinel at = 8.0870 + 35.24 × 10-6t + 45.73 × 10-9t2, 22 〈 t 〈 840°C; ferroan gahnite at = 8.1050 + 54.35 × 10-6t + 10.53 × 10-9t2, 22 〈 t 〈 845°C; magnesiochromite at = 8.2965 + 56.82 × 10-6t + 8.08 × 10-9t2, 22 〈 t 〈 823°C, synthetic spinel at = 8.0821 + 45.79 × 10-6t + 35.69 × 10-9t2, 26 〈 t 〈 800°C, where at is the lattice parameter in Å at t°C. Expressions for thermal expansions are derived. The replacement of magnesium cations by zinc and iron and of A12O3 by Cr2O3 in spinel decreases the mean thermal expansion in the range of temperatures covered, but increases the lattice parameters.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739475001775
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