PREPARATION OF (NH4)ZR2(PO4)3 AND HZR2(PO4)3
- Additional Document Info
- View All
(NH4)Zr2(PO4)3 has been prepared, hydrothermally, from -zirconium phosphate in three different ways; (1) from amine intercalates at 300C, (2) from mixtures of ZrOCl28H2O in excess (NH4)H2PO4 and (3) reaction of NH4Cl with Zr(NaPO4)2. Ammonium dizirconium triphosphate is rhombohedral with a = 8.676(1) and c = 24.288(5) A . It decomposed on heating to HZr2(PO4)3. Below 600C a complex, as yet unindexed, X-ray pattern was obtained. A very similar X-ray pattern was obtained by washing LiTi0.1Zr1.9(PO4)3 with 0.3N HCl. Heating this phase or NH4Zr2(PO4)3, above 600C resulted in the appearance of a rhombohedral phase of HZr2(PO4)3 with cell dimensions a = 8.803(5) and c = 23.23(1) A . The protons were not completely removed until about 1150C. Decomposition of (NH4)Zr2(PO4)3 at 450C yielded an acidic gas whereas at 700C NH3 was evolved. A possible explanation for this behavior is presented. 1984.
MATERIALS RESEARCH BULLETIN
author list (cited authors)
CLEARFIELD, A., ROBERTS, B. D., & SUBRAMANIAN, M. A.
complete list of authors
CLEARFIELD, A||ROBERTS, BD||SUBRAMANIAN, MA