Synthesis of high-surface-area complex zirconium phosphates via mechanochemical activation route

Vladislav A. Sadykov, Svetlana N. Pavlova, Galina V. Zabolotnaya, Raisa I. Maximovskaya, Sergei V. Tsybulya, Elena B. Burgina, Vladimir I. Zaikovskii, Galina S. Litvak, Marina V. Chaikina, Valerii V. Lunin, Natalya N. Kuznetsova, Rustum Roy, Dinesh K. Agrawal

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Abstract

High-power ball mill activation of the mixture of hydrated zirconium and lanthanum salts (oxonitrates, oxochlorides) with ammonium phosphate followed by hydrothermal treatment at temperatures not exceeding 200°C and a nearly neutral pH was found to yield crystalline dispersed phase of a cubic NH4Zr2(PO4)3 type along with admixtures of disordered orthorhombic compounds of a zirconium orthophosphate type. In the same conditions and at the same Zr/P ratio, hydrothermal treatment of gels obtained by reacting mixed zirconium and lanthanum nitrates solutions with ammonium phosphates yields no crystalline products, and only treatment in acid media generates a phase of the α-ZrPO4(OH) type coexisting with the NH4Zr2(PO4)3 phase if polyethylene oxide is present. X-ray powder diffraction, transmission electron microscopy, 31MAS-NMR, FTIRS and thermal analysis were applied to elucidate factors affecting crystallization of complex zirconium phosphates in the hydrothermal conditions. The most essential factor appears to be generation of some nuclei of zirconium phosphates under high pressures developed in the course of mixed solids mechanical activation. These nuclei are embedded into matrix of such well-crystallized solid products as ammonium nitrate or chloride. Hence, metastable cubic or orthorhombic structure of the phases obtained via mechanical activation route can be assigned to the nuclei-matrix orientation relationship. Due to easily scaled-up synthesis procedure, these results appear to be very promising for manufacturing of dispersed framework zirconium phosphates as acid catalysts or fast proton conductors.

Original languageEnglish (US)
Pages (from-to)328-337
Number of pages10
JournalMaterials Research Innovations
Volume2
Issue number6
DOIs
Publication statusPublished - Jan 1 1999

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Sadykov, Vladislav A. ; Pavlova, Svetlana N. ; Zabolotnaya, Galina V. ; Maximovskaya, Raisa I. ; Tsybulya, Sergei V. ; Burgina, Elena B. ; Zaikovskii, Vladimir I. ; Litvak, Galina S. ; Chaikina, Marina V. ; Lunin, Valerii V. ; Kuznetsova, Natalya N. ; Roy, Rustum ; Agrawal, Dinesh K. / Synthesis of high-surface-area complex zirconium phosphates via mechanochemical activation route. In: Materials Research Innovations. 1999 ; Vol. 2, No. 6. pp. 328-337.