Variability of alpha/szlig Inversion Temperatures of Natural QuartzJournal: International Journal of Science and Research (IJSR) (Vol.3, No. 10)
Publication Date: 2014-10-05
Authors : M. Blasy;
Page : 454-458
Keywords : Pegmatite; quartz; hydrothermal; DTA; inversion; heating rate; particle size;
The inversion temperature of quartz at atmospheric pressure is 573 C. This temperature shows some variability caused by source of quartz, particle sizes, heating rate and pressure ( nitrogen atmosphere). The differential thermal analysis ( DTA) of natural hydrothermal and pegmatite quartz indicate that, 1- the inversion temperatures of both natural pegmatite quartz and natural hydrothermal quartz with the same particle size ( 0.1 mm) and the same heating rate (10 C /min. ) are 582.14C and 582.4 C respectively with small differences ( ~0.3C - 0.5C).2- by changing the rate of heating from 10 C / min to 15 C /min, the inversion temperature of pegmatite quartz changed from 582.14 to 584.60 C and hydrothermal quartz temperature changed from 582.40 C to 585.10 C with relatively large differences ( ~ 2.46C 2.7 C).3- by increasing the particle size of pegmatite quartz to 1.0 mm. at heating rate 10 C / min, the inversion temperature increased to 587.0 C.4- by decreasing the particle size of pegmatite quartz to 0.05 mm at heating rate 10 C /min. , the inversion temperature disappeared.5-The hydrothermal quartz not show thermal activity above the inversion temperature but the pegmatite quartz has thermal activity above the inversion temperature.
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