Geopolymers
Inorganic polymeric new materials
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Gisele Cristiane Becher Ribas
Gisele Cristiane Becher Ribas
São Paulo State University (UNESP), IQ/CAr, Rua Francisco Degni s/n, Araraquara, São Paulo, Brazil gigicri@gmail.com
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Gledison Rogério de Souza
Gledison Rogério de Souza
São Paulo State University (UNESP), IQ/CAr, Rua Francisco Degni s/n, Araraquara, São Paulo, Brazil gigicri@gmail.com
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Fernando Luis Fertonani
Fernando Luis Fertonani
São Paulo State University (UNESP), IBILCE, Rua Cristovão Colombo, São José do Rio Preto, São Paulo 2265, Brazil
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Abstract
Thermogravimetry (TG), energy dispersive X-ray microanalysis (EDX), scanning electron microscopy (SEM), mapping surface and X-ray diffraction (XRD) have been used to study the reaction of mercury with platinum–rhodium (Pt–Rh) alloy. The results suggest that, when heated, the electrodeposited Hg film reacts with Pt–Rh to form intermetallic compounds each having a different stability, indicated by separate third mass-loss steps. In the first step, between room temperature and 170 °C, only the bulk Hg is removed. From this temperature to about 224 °C, the mass loss can be attributed to decomposition of the intermetallic PtHg4. The third step, from 224 to 305 °C, can be ascribed to thermal decomposition of solid solution composed of intermetallic species RhHg2 and PtHg2. Intermetallic compound such as PtHg4, PtHg2, and RhHg2 was characterized by XRD. These intermetallic compounds were the main products formed on the surface of the samples after partial removal of the bulk mercury via thermal desorption.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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