Synthesis of NaTi2(PO4)3 by the Inorganic–Organic Steric Entrapment Method and Its Thermal Expansion Behavior

Daniel Ribero, Kevin C. Seymour, Waltraud M. Kriven, M. A. White

Research output: Contribution to journalArticle

Abstract

Crystalline pure NaTi2(PO4)3 (NTP) powder was synthesized at 700°C using a simple and low energy, hybrid inorganic–organic, steric entrapment method. Sodium nitrite (NaNO2) and ammonium phosphate dibasic ((NH4)2HPO4) dissolved in water, whereas titanium (IV) isopropoxide (Ti[OCH(CH3)2]4) hydrolyzed in water. Ethylene glycol (HOCH2CH2OH) was used as a polymeric entrapper and hydrolysis of the Ti source was hindered by its dissolution in isopropyl alcohol. The resulting NTP powder was characterized by thermogravimetric analysis/differential thermal analysis, X-ray diffractometry, scanning electron microscopy, specific surface area by Brunauer–Emmett–Teller nitrogen absorption, and particle size analysis. Furthermore, C, H, N were measured by the classical Pregl-Dumas method. The thermal expansion behavior in all {hkl} pole directions was also determined by in situ high-temperature X-ray diffraction using synchrotron radiation and was found to be in agreement with other published studies.

Original languageEnglish (US)
Pages (from-to)3586-3593
Number of pages8
JournalJournal of the American Ceramic Society
Volume99
Issue number11
DOIs
StatePublished - Nov 1 2016

Keywords

  • negative thermal expansion
  • synthesis
  • thermal expansion
  • titanium phosphate

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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