By W. Smykatz-Kloss
Initially look it might look presumptuous to wish so as to add another to the various books on Differential Thermal research (DT A). Thermoanalytical tools were in use for your time, as proven via the greater than 5 thousand guides containing DT A or TG curves indexed through SMOTHERS and CHIANG within the bibliography to their instruction manual and abstracted within the a number of volumes of Thermal research Abstracts (TAA), edited through J. P. REDFERN for the foreign Con federation for Thermal research (ICT A). each 3 years the continue ings of ICT A conferences are released, bringing the most recent result of thermoanalytic examine. there's additionally the Scifax DT a knowledge Index, edited by means of R. C. MACKENZIE (1962) and modeled at the ASTM development card index (used for X-ray investigations), a compilation of the DT an information for a number of hundred minerals, and inorganic and natural fabrics. The theoretical foundations of thermogravimetry and DT A were defined intimately by way of LEHMANN, DAS and PAETSCH (1953), R. C. MACKENZIE (1957, 1970), DUVAL (1963), WENDLANDT (1964), GARN (1965), F. PAULIK et al. (1966), SMOTHERS and CHIANG (1966), and KEATTCH (1969). Thermoanalytical effects are strongly inspired by means of different factors relative to guidance and gear (see 1-2. four of this study). this is why why we regularly locate, in those books in addition to within the Scifax-Card catalog, contradictory info at the similar substance.
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Extra info for Differential Thermal Analysis: Application and Results in Mineralogy (Minerals, Rocks and Mountains)
The alunite, see KASHKAI and BABAEV and Table 5), or structural transformations like anglesite (89,5° C, McLAUGHLIN) or thenardite which can be recognized at three reversible structural changes, at 147,215, and 245 C (see Fig. 11). By means of combined thermal optical methods, as has been described by HEIDE (1969) for the examples epsomite and kieserite, in favourable cases the intermediate reactions appearing on heating of hydrated sulfates allow the determination of kinetic data about these reactions.
Sulfur shows a weak endothermic reaction at 130 0 C (melting point, after Kopp and KERR, 1957), and a very strong exothermic deflection with a peak at 380 0 C (oxidation of S to S02). The author's DTA runs of greater sensibility show the endothermic peak caused by melting at 120 0 C (melting point, after D'ANS-LAX: 119° C), and at 96° C another weak endothermic peak occurs reflecting the structural transformation from orthorhombic to monocline. 2). This very intensive oxidation deflection (peak) allows very small quantities of sulfur in a rock sample to be determined.
0 ;J> ...... ::l. I" w o 31 Halogenides t:. T [OC] (+) 7 6 7 6 10 10 2 5 , 10 9 3 '. 1 13 , 9 1 5 2 o '00 II 16 16 16 16 6 8 , l' 3 7 6 1 13 500 ~ r 11 10 I j 15 15 9 2 3 13 15 12 16 8 12 7 I 15 6 2 600 If 700 800 900 t [OC] Fig. 9. Oxidation reactions of sulfides> 400° C; peak temperatures versus Ll T(ordinate). 8 and 9 as in Table 3 temperatures (103 0 resp. 137 0 C) than the cubic tennantite (319° C), and the inversion temperature of the monoclinic acanthite (180° C) lies below that of the orthorhombic stephanite (270° C), both being silver sulfides.