Phase Interaction in the Systems Sodium Selenate - Copper Selenate - Water and Sodium Selenate - Zinc Selenate - Water at 25 °C

The phase equilibrium in the systems Na2SeO4–CuSeO4–H2O and Na2SeO4–ZnSeO4–H2O were studied and it was established that new phases were obtained – double salts with a composition: Na2Cu(SeO4)2 · 2 H2O and Na2Zn(SeO4)2 · 2 H2O. The fields of phase equilibrium of the double salts in the triple systems...

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Veröffentlicht in:Crystal research and technology (1979) 1991, Vol.26 (8), p.1071-1075
Hauptverfasser: Oykova, T., Mihov, D., Pavlova, P.
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Mihov, D.
Pavlova, P.
description The phase equilibrium in the systems Na2SeO4–CuSeO4–H2O and Na2SeO4–ZnSeO4–H2O were studied and it was established that new phases were obtained – double salts with a composition: Na2Cu(SeO4)2 · 2 H2O and Na2Zn(SeO4)2 · 2 H2O. The fields of phase equilibrium of the double salts in the triple systems were determined. The composition of the new phases was investigated by the Schreinemackers' method of physico‐chemical analysis, and the number of the water molecules of crystallization – by thermogravimetrical analysis. An X‐ray diffraction analysis of the new phases obtained was done. Untersucht werden die Phasengleichgewichte in den Systemen Na2SeO4 – CuSeO4 – H2O und Na2SeO4–ZnSeO4–H2O. Dabei wird festgestellt, daß in beiden Phasen neue Phasen entstehen, nämlich Doppelsalze der Zusammensetzung Na2Cu(SeO4)2 · 2H2O und Na2Zn(SeO4)2 · 2H2O. Die Felder der im Gleichgewicht existierenden Doppelsalze in den Dreistoffsystemen werden bestimmt. Die Zusammensetzung der neuen Phasen wird auf physikalisch‐chemischem Wege nach der Methode von Schreinemackers, die Anzahl der Kristallwassermoleküle auch durch derivatographische Analyse bestimmt. Die entstandenen neuen Phasen werden mittels Röntgenphasenanalyse untersucht.
doi_str_mv 10.1002/crat.2170260820
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The fields of phase equilibrium of the double salts in the triple systems were determined. The composition of the new phases was investigated by the Schreinemackers' method of physico‐chemical analysis, and the number of the water molecules of crystallization – by thermogravimetrical analysis. An X‐ray diffraction analysis of the new phases obtained was done. Untersucht werden die Phasengleichgewichte in den Systemen Na2SeO4 – CuSeO4 – H2O und Na2SeO4–ZnSeO4–H2O. Dabei wird festgestellt, daß in beiden Phasen neue Phasen entstehen, nämlich Doppelsalze der Zusammensetzung Na2Cu(SeO4)2 · 2H2O und Na2Zn(SeO4)2 · 2H2O. Die Felder der im Gleichgewicht existierenden Doppelsalze in den Dreistoffsystemen werden bestimmt. Die Zusammensetzung der neuen Phasen wird auf physikalisch‐chemischem Wege nach der Methode von Schreinemackers, die Anzahl der Kristallwassermoleküle auch durch derivatographische Analyse bestimmt. 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Res. Technol</addtitle><description>The phase equilibrium in the systems Na2SeO4–CuSeO4–H2O and Na2SeO4–ZnSeO4–H2O were studied and it was established that new phases were obtained – double salts with a composition: Na2Cu(SeO4)2 · 2 H2O and Na2Zn(SeO4)2 · 2 H2O. The fields of phase equilibrium of the double salts in the triple systems were determined. The composition of the new phases was investigated by the Schreinemackers' method of physico‐chemical analysis, and the number of the water molecules of crystallization – by thermogravimetrical analysis. An X‐ray diffraction analysis of the new phases obtained was done. Untersucht werden die Phasengleichgewichte in den Systemen Na2SeO4 – CuSeO4 – H2O und Na2SeO4–ZnSeO4–H2O. Dabei wird festgestellt, daß in beiden Phasen neue Phasen entstehen, nämlich Doppelsalze der Zusammensetzung Na2Cu(SeO4)2 · 2H2O und Na2Zn(SeO4)2 · 2H2O. Die Felder der im Gleichgewicht existierenden Doppelsalze in den Dreistoffsystemen werden bestimmt. 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Res. Technol</addtitle><date>1991</date><risdate>1991</risdate><volume>26</volume><issue>8</issue><spage>1071</spage><epage>1075</epage><pages>1071-1075</pages><issn>0232-1300</issn><eissn>1521-4079</eissn><coden>CRTEDF</coden><abstract>The phase equilibrium in the systems Na2SeO4–CuSeO4–H2O and Na2SeO4–ZnSeO4–H2O were studied and it was established that new phases were obtained – double salts with a composition: Na2Cu(SeO4)2 · 2 H2O and Na2Zn(SeO4)2 · 2 H2O. The fields of phase equilibrium of the double salts in the triple systems were determined. The composition of the new phases was investigated by the Schreinemackers' method of physico‐chemical analysis, and the number of the water molecules of crystallization – by thermogravimetrical analysis. An X‐ray diffraction analysis of the new phases obtained was done. Untersucht werden die Phasengleichgewichte in den Systemen Na2SeO4 – CuSeO4 – H2O und Na2SeO4–ZnSeO4–H2O. Dabei wird festgestellt, daß in beiden Phasen neue Phasen entstehen, nämlich Doppelsalze der Zusammensetzung Na2Cu(SeO4)2 · 2H2O und Na2Zn(SeO4)2 · 2H2O. Die Felder der im Gleichgewicht existierenden Doppelsalze in den Dreistoffsystemen werden bestimmt. Die Zusammensetzung der neuen Phasen wird auf physikalisch‐chemischem Wege nach der Methode von Schreinemackers, die Anzahl der Kristallwassermoleküle auch durch derivatographische Analyse bestimmt. Die entstandenen neuen Phasen werden mittels Röntgenphasenanalyse untersucht.</abstract><cop>Berlin</cop><pub>WILEY-VCH Verlag</pub><doi>10.1002/crat.2170260820</doi><tpages>5</tpages></addata></record>
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source Wiley Online Library Journals Frontfile Complete
subjects Condensed matter: structure, mechanical and thermal properties
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Physics
Specific phase transitions
title Phase Interaction in the Systems Sodium Selenate - Copper Selenate - Water and Sodium Selenate - Zinc Selenate - Water at 25 °C
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