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Synthesis of special pigments

A study by means of TA methods

Journal of Thermal Analysis and Calorimetry
Authors: Z. Šolc and M. Trojan

Abstract  

Several TA methods (including dynamic TA, Q-TA, emanation and special conductometric TA) were used in investigations of condensed phosphate synthesis, and in the evaluation and control of the reactivity of the raw materials, when high-temperature stable pigments are developed. Conductometric TA occupies a special position because of its high sensitivity to most changes in crystal structure at the beginning of reactions.

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Abstract  

In our laboratory, the synthesis of new inorganic pigments is followed by thermal analysis using a derivatograph apparatus. First information about the temperature region of the formation of the pigments investigated is provided by thermal analysis. The attention was directed to the preparation of the pigments based on zinc oxide in new green hues which can be used as medium colour pigments.

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Abstract  

The synthesis of new compounds based on Bi2O3 is investigated because they can be used as new ecological inorganic pigments. Chemical compounds of the (Bi2O3)1−x(Y2O3)x type were synthesized. The host lattice of these pigments is Bi2O3 that is doped by Y3+ ions. The incorporation of doped ions provides the interesting colours and contributes to a growth of the thermal stability of these compounds. The simultaneous TG-DTA measurements were used for determination of the temperature region of the pigment formation and thermal stability of pigments. This paper also contains the results of the pigment characterization by X-ray powder diffraction and their colour properties.

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Abstract  

The synthesis of new compounds based on CeO2-PrO2-La2O3, which can be used as pigments for colouring of ceramic glazes, is investigated in our laboratory. The optimum conditions for the syntheses of these compounds have been estimated. The first information about the temperature region of the formation of the pigments investigated is provided by thermal analysis. The synthesis of these compounds is followed by thermal analysis using STA 449/C Jupiter (Netzsch, Germany).

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Abstract  

The synthesis of new compounds based on CeO2 is investigated in our laboratory. The main attention is directed to the preparation of these compounds which can be used as pigments for colouring of ceramic glazes. The synthesis of these compounds is based on high-temperature calcination of starting oxides. The optimum conditions for the syntheses of compounds have been estimated and the pigments prepared have been evaluated from the standpoint of their structure.

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Abstract  

The synthesis of new compounds based on Bi2O3 is investigated because they can be used as new environmentally friendly inorganic pigments. Chemical compounds of the (Bi2O3)1–x(Er2O3)x type were synthetized. The host lattice of these pigments is Bi2O3 that is doped by Er3+ ions. The incorporation of doped ions provides interesting colours and contributes to an increase in the thermal stability of these compounds. The simultaneous TG-DTA measurements were used for determination of the temperature region of the pigment formation and thermal stability of pigments.

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Abstract  

Binary Zn(II)–Sr(II) cyclo-tetraphosphates have been synthesised as new binary compounds. The synthesis is based on a thermal procedure making use of the reversible transformation of cyclo- tetraphosphates to higher linear phosphates. With respect to the proposed application of these products as special inorganic pigments some properties (thermal stability, structural parameters, anticorrosion activity) have been determined.

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