Preparation of (NH/sub 4/)Zr/sub 2/(PO/sub 4/)/sub 3/ and HZr/sub 2/(PO/sub 4/)/sub 3/
Journal Article
·
· Mater. Res. Bull.; (United States)
(NH/sub 4/)Zr/sub 2/(PO/sub 4/)/sub 3/ has been prepared, hydrothermally, from ..cap alpha..-zirconium phosphate in three different ways: (1) from amine intercalates at 300/sup 0/C, (2) from mixtures of ZrOC1/sub 2/ X 8H/sub 2/O in excess (NH/sub 4/)H/sub 2/PO/sub 4/ and (3) reaction of NH/sub 4/C1 with Zr(NaPO/sub 4/)/sub 2/. Ammonium dizirconium triphosphate is rhombohedral with a = 8.676(1) and c = 24.288(5)A. It decomposed on heating to HZr/sub 2/(PO/sub 4/)/sub 3/. Below 600/sup 0/C a complex, as yet unindexed, Xray pattern was obtained. A very similar X-ray pattern was obtained by washing LiTi /SUB 0.1/ Zr /SUB 1.9/ (PO/sub 4/)/sub 3/ with 0.3N HC1. Heating this phase or NH/sub 4/Zr/sub 2/(PO/sub 4/)/sub 3/ above 600/sup 0/C resulted in the appearance of a rhombohedral phase of HZr/sub 2/(PO/sub 4/)/sub 3/ with cell dimensions a = 8.803(5) and c = 23.23(1)A. The protons were not completely removed until about 1150/sup 0/C. Decomposition of (NH/sub 4/)Zr/sub 2/(PO/sub 4/)/sub 3/ at 450/sup 0/C yielded an acidic gas whereas at 700/sup 0/C NH/sub 3/ was evolved. A possible explanation for this behavior is presented.
- Research Organization:
- Department of Chemistry, Texas A and M University, College Station, Texas
- OSTI ID:
- 6139855
- Journal Information:
- Mater. Res. Bull.; (United States), Journal Name: Mater. Res. Bull.; (United States) Vol. 19:2; ISSN MRBUA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
AMMONIUM COMPOUNDS
AMMONIUM PHOSPHATES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DECOMPOSITION
HALIDES
HALOGEN COMPOUNDS
HIGH TEMPERATURE
HYDRIDES
HYDROGEN COMPOUNDS
HYDROTHERMAL SYNTHESIS
KINETICS
NITROGEN CHLORIDES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PYROLYSIS
REACTION KINETICS
SODIUM COMPOUNDS
SODIUM PHOSPHATES
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRIGONAL LATTICES
VERY HIGH TEMPERATURE
YIELDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM PHOSPHATES
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
AMMONIUM COMPOUNDS
AMMONIUM PHOSPHATES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DECOMPOSITION
HALIDES
HALOGEN COMPOUNDS
HIGH TEMPERATURE
HYDRIDES
HYDROGEN COMPOUNDS
HYDROTHERMAL SYNTHESIS
KINETICS
NITROGEN CHLORIDES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PYROLYSIS
REACTION KINETICS
SODIUM COMPOUNDS
SODIUM PHOSPHATES
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRIGONAL LATTICES
VERY HIGH TEMPERATURE
YIELDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM PHOSPHATES