By W. Smykatz-Kloss
At first look it could actually appear presumptuous to wish so as to add another to the varied books on Differential Thermal research (DT A). Thermoanalytical tools were in use for it slow, as proven by way of the greater than 5 thousand guides containing DT A or TG curves indexed by means of 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 overseas 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 study. there's additionally the Scifax DT an information Index, edited via R. C. MACKENZIE (1962) and modeled at the ASTM trend card index (used for X-ray investigations), a compilation of the DT a knowledge for numerous hundred minerals, and inorganic and natural fabrics. The theoretical foundations of thermogravimetry and DT A were defined intimately through 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 motivated through different factors relative to guidance and gear (see 1-2. four of this study). because of this why we regularly locate, in those books in addition to within the Scifax-Card catalog, contradictory facts at the comparable substance.
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0) 190 "Limonite" (Fe 2 0 3 . ) and diaspore (535°). the chemical composition also influences the dehydration of goethites: a synthetic goethite sample which had incorporated nearly 30 mole-% AlOOH in its structure (THIEL) showed a peak 40° C lower and a broader deflection oflower L1 Tcompared with the peak of a well-ordered and pure goethite. Recently KUHNEL, VAN HILTEN and ROORDA studied the crystallinity (the degree of disorder) of goethites from laterite profiles by means of X-ray and DT A methods.
D rounded, without any clearly perceptible top (peak). The distinction by DT A between graphite and organic matter will of course not be very simple (see II-9). 2. ) which are generally very aggressive, as they tend to combine with metals very quickly. So the endothermic peak at 680 0 C, observed in DTA runs of pyrite (Kopp and KERR, 1958; SMYKATZ-KLOSS, 1966), shows that the surface of the nickel sample holder used in these runs has been partly altered to Ni 3 S 2 (heazlewoodite, COLE and CROOK).
A semi-quantitative determination of chalcogenides is much more difficult than of other minerals, because of their very strong and complicated oxidation behaviour. 3); substitution of S by Se lowers the transformation and oxidation peak temperatures in the series galena (PbS; tox = 800° C)~claust h~lite, (PbSe; tox=660° C, DUNNE and KERR, 1961), and substitution of Ln by Fe in sphalerites is also reflected by the lowering of a structural transformation temperature (Kopp and KERR, 1958a). The data of Table 3 were obtained by heating (lOa/min) a mixture of 50 mg sulfide (finely ground to 60-200 110) and 100 mg Al 2 0 3 in the Mettler thermoanalyzer 2.