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  • 1 School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
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Abstract

Nanocrystalline NH4ZrH(PO4)2·H2O was synthesized by solid-state reaction at low heat using ZrOCl2·8H2O and (NH4)2HPO4 as raw materials. X-ray powder diffraction analysis showed that NH4ZrH(PO4)2·H2O was a layered compound with an interlayer distance of 1.148 nm. The thermal decomposition of NH4ZrH(PO4)2·H2O experienced four steps, which involves the dehydration of the crystal water molecule, deamination, intramolecular dehydration of the protonated phosphate groups, and the formation of orthorhombic ZrP2O7. In the DTA curve, the three endothermic peaks and an exothermic peak, respectively, corresponding to the first three steps' mass losses of NH4ZrH(PO4)2·H2O and crystallization of ZrP2O7 were observed. Based on Flynn–Wall–Ozawa equation and Kissinger equation, the average values of the activation energies associated with the NH4ZrH(PO4)2·H2O thermal decomposition and crystallization of ZrP2O7 were determined to be 56.720 ± 13.1, 106.55 ± 6.28, 129.25 ± 4.32, and 521.90 kJ mol−1, respectively. Dehydration of the crystal water of NH4ZrH(PO4)2·H2O could be due to multi-step reaction mechanisms: deamination of NH4ZrH(PO4)2 and intramolecular dehydration of the protonated phosphate groups from Zr(HPO4)2 are simple reaction mechanisms.

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  • Impact Factor (2019): 2.731
  • Scimago Journal Rank (2019): 0.415
  • SJR Hirsch-Index (2019): 87
  • SJR Quartile Score (2019): Q3 Condensed Matter Physics
  • SJR Quartile Score (2019): Q3 Physical and Theoretical Chemistry
  • Impact Factor (2018): 2.471
  • Scimago Journal Rank (2018): 0.634
  • SJR Hirsch-Index (2018): 78
  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
  • SJR Quartile Score (2018): Q2 Physical and Theoretical Chemistry

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
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)