Thermoanalytical properties of analytical-grade reagents—II1Caesium salts

Erdey, L.; Liptay, G.; Gál, S.

doi:10.1016/0039-9140(65)80246-6

Cited by 43 publications

(27 citation statements)

References 3 publications

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“…The exact temperatures of these peaks are given in Table 1. Two additional endothermic peaks characterize the melting and evaporation of the alkali halide [13]. The first peak is very sharp and its location does not depend on the heating rate.…”

Section: Dta and Tg Of Kaolinite Mixed Or Air Ground With Alkali Halidesmentioning

confidence: 97%

Study of the interaction between caesium bromide and kaolinite by differential thermal analysis

Yariv

Ahmed

Deutsch

et al. 1991

Journal of Thermal Analysis

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The reaction occurring during the wet grinding of kaolinite with CsBr was studied by simultaneous Differential Thermal Analysis -Thermogravimetry (DTA-TG), supplemented by infrared spectroscopy of isothermally treated CsBr disks. The DTA and TG curves were compared with those of untreated kaolinite and of kaolinite mixed or air ground with different alkali halides. A new endothermic DTA peak at 75-115 ~ accompanied by weight loss, is due to the desorption of surface and interparticle water located mainly at the "interface" between the mineral and the salt. A second endothermic peak at about 500 ~ represents the simultaneous dehydroJcylation of the clay and thermal hydrolysis of CsBr. The presence of a separate CsBr phase was identified from two endothermic peaks which characterize melting and boiling of the salt; only mixtures with more than 140 mmol CsBr per 100 g kaolinite show the presence of this phase. All of the CsBr below this concentration occurs in the CsBr-HOH-kaolinite intercalation complex. This degree of saturation is smaller than that obtained previously for CsCl.

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Section: Dta and Tg Of Kaolinite Mixed Or Air Ground With Alkali Halidesmentioning

confidence: 97%

Study of the interaction between caesium bromide and kaolinite by differential thermal analysis

Yariv

Ahmed

Deutsch

et al. 1991

Journal of Thermal Analysis

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“…In Fig. 1 The Derivatograph has been used to determine the moisture and structural water in a number of analytical grade reagents and the temperatures at which these materials can be dried without decomposition [5][6][7]. The thermal decomposition curve of sodium thiosulphate is presented in Fig.…”

mentioning

confidence: 99%

Determination of water content by means of the Derivatograph

Simon

1972

Journal of Thermal Analysis

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The determination of water content by means of the Derivatograph is treated in the paper. The determination of water in analytical precipitates, various pharmaceutical products, biological substances, the products of food industry is treated on the basis of some practical examples. The applicability of the Derivatograph for determining the adsorption capacity of industrial adsorbents, the hydration conditions of cement, the system Ca3A--CaSO4 9 HyO and the rehydrability of clay minerals is demonstrated. The aluminium oxide barrier layers were investigated on the basis of the water content of the aluminium hydroxide. For the characterization of the different strengths by which water is bound in strontium chloride hydrates the apparent activation energies are also presented.Thermal methods of drying have long been used to determine the moisture in solid substances. In the case of both the direct and indirect determinations the moisture is generally removed from the substance by heating; in the first case the water is bound by an adsorbent and the weight increase is measured while in the second the residue is weighed. These water determinations can be made under isothermal or non-isothermal, dynamic conditions, or in their combination.In the past nearly fifteen years the Derivatograph [1 ] has been successfully used in the determination of moisture. Taking into account that in the course of thermal analysis only thermal energy is transmitted to the sample, the temperature at which the water is released is to a first approximation characteristic of the strength of bonding of the water. On this basis the relatively loosely bound water (adhesion, inclusion, adsorption) which is released at a relatively low temperature can be distinguished from strongly bound water (zeolitic, crystal and structural) which is lost at a higher temperature.The present paper is a survey of the fields in which this complex thermal apparatus has been applied to the determination of water bound by the different forces.The device has been widely used to investigate the structures and thermal behaviours of precipitates used in gravimetric analysis [2][3][4]. Some bivalent metal ions, such as Mg 2+, Mn 2+, Be 2., Cd 2+, Zn 2+ and Co ~+ give precipitates with diammonium hydrogen phosphate in an aqueous solution containing ammonium chloride. The thermal decompositions of the ammonium phosphate precipitates of the various ions proceed very similarly. In Fig. 1 are shown the decomposition Y. Thermal Anal. 4, I972

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“…Above 200 • C, the substance sublimes and after sublimation it dissociates completely in the gaseous phase into ammonia and hydrochloric acid. 43,44 Hence, the weight loss (37 wt.%) associated to an endothermic peak centred at 220 • C can be assigned to the above mentioned processes.…”

Section: Synthesismentioning

confidence: 99%