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In situ Phase Analysis of the Thermal Decomposition Products of Zirconium Salts

Goran Štefanić ; Ruđer Bošković Institute, P. O. Box 1016, 10001 Zagreb, Croatia
Biserka Gržeta ; Ruđer Bošković Institute, P. O. Box 1016, 10001 Zagreb, Croatia
Stanko Popović ; Department of Physics, Faculty of Science, University of Zagreb, P. O. Box 162, 10001 Zagreb, Croatia
Svetozar Musić ; Ruđer Bošković Institute, P. O. Box 1016, 10001 Zagreb, Croatia

Puni tekst: engleski, pdf (165 KB) str. 395-412 preuzimanja: 436* citiraj
APA 6th Edition
Štefanić, G., Gržeta, B., Popović, S. i Musić, S. (1999). In situ Phase Analysis of the Thermal Decomposition Products of Zirconium Salts. Croatica Chemica Acta, 72 (2-3), 395-412. Preuzeto s https://hrcak.srce.hr/132180
MLA 8th Edition
Štefanić, Goran, et al. "In situ Phase Analysis of the Thermal Decomposition Products of Zirconium Salts." Croatica Chemica Acta, vol. 72, br. 2-3, 1999, str. 395-412. https://hrcak.srce.hr/132180. Citirano 10.04.2020.
Chicago 17th Edition
Štefanić, Goran, Biserka Gržeta, Stanko Popović i Svetozar Musić. "In situ Phase Analysis of the Thermal Decomposition Products of Zirconium Salts." Croatica Chemica Acta 72, br. 2-3 (1999): 395-412. https://hrcak.srce.hr/132180
Harvard
Štefanić, G., et al. (1999). 'In situ Phase Analysis of the Thermal Decomposition Products of Zirconium Salts', Croatica Chemica Acta, 72(2-3), str. 395-412. Preuzeto s: https://hrcak.srce.hr/132180 (Datum pristupa: 10.04.2020.)
Vancouver
Štefanić G, Gržeta B, Popović S, Musić S. In situ Phase Analysis of the Thermal Decomposition Products of Zirconium Salts. Croatica Chemica Acta [Internet]. 1999 [pristupljeno 10.04.2020.];72(2-3):395-412. Dostupno na: https://hrcak.srce.hr/132180
IEEE
G. Štefanić, B. Gržeta, S. Popović i S. Musić, "In situ Phase Analysis of the Thermal Decomposition Products of Zirconium Salts", Croatica Chemica Acta, vol.72, br. 2-3, str. 395-412, 1999. [Online]. Dostupno na: https://hrcak.srce.hr/132180. [Citirano: 10.04.2020.]

Sažetak
X-ray powder diffraction at high temperature was used to determine the phase composition of the thermal decomposition products of two zirconium salts, Zr(SO4)2 ⋅ 4 H2O and ZrO(N03)2 ⋅ 2 H2O, and of a mixture of zirconium nitrates having Zr(OH)2(NO3)2 ⋅ 4.7 H2O and ZrO(NO3)2 ⋅ 2 H2O as dominant components. Heating of the samples up to 1200 °C was performed inside a high-temperature chamber, attached to a diffractometer, at an air pressure of ≈ 2 × 10-3 Pa. Regardless of the structural differences in the start-ing salts, thermal decomposition products crystallized to t-ZrO2, which remained stable up to 1200 °C. This result indicated that the structural nature of the starting materials was not the most important factor of metastable t-ZrO2 formation. The thermodynamically stable m-ZrO2 appeared after the cooling of the samples to room temperature. If the cooling was performed at low air pressure, the m-ZrO2 content was small. Introduction of air, even at RT, caused a considerable increase of m-ZrO2, which became the dominant phase in ali cases. The important role of oxygen in the t-ZrO2m-ZrO2 transition indicates that the lack of oxygen in the zirconia lattice favours the formation of metastable t-ZrO2.

Ključne riječi
t-ZrO2; m-ZrO2; X-ray diffraction; in situ phase analysis; phase transitions; lattice defects

Hrčak ID: 132180

URI
https://hrcak.srce.hr/132180

Posjeta: 586 *