Aluminum and boron phosphates as possible proton conductors
Conference
·
OSTI ID:6342539
The chemical stability and conductivity of boron and aluminum phosphates in steam are reported for P/B and P/A1 atomic ratios greater than unity at temperatures from 100/sup 0/ to 280/sup 0/C and steam pressures to 5 atmospheres. Al(PO/sub 3/)/sub 3/ and H/sub 2/ A1P/sub 3/O/sub 10/ undergo the reactions Al (PO/sub 3/)/sub 3/ + H/sub 2/) in equilibrium H/sub 2/AlP/sub 3/O/sub 10/ and H/sub 2/AlP/sub 3/O/sub 10/ ..-->.. AlPO/sub 4/ + H/sub 2/O.P/sub 2/O/sub 5/(g). At 280/sup 0/C and a steam pressure of 5 atmospheres gauge the product is mixture of AlPO/sub 4/ and H/sub 2/ALP/sub 3/O/sub 10/, while the conductivity of this solid is in the range of 10/sup -2/ ohm/sup -1/ cm/sup -1/. The boron phosphates lose material and exhibit poor conductivity under similar conditions due to the instability of the BPO/sub 4/ phase as a result of the reaction 2BPO/sub 4/ + 6 H/sub 2/O ..-->.. B/sub 2/O/sub 3/.3H/sub 2/O(g) + P/sub 2/O/sub 5/. 3H/sub 2/O(g). As a result of dehydration or hydrolytic reactions an increase in water vapor pressure does not always lead to increased conductivity even at higher temperature.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6342539
- Report Number(s):
- BNL-36682; CONF-850799-2; ON: DE86002508
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM PHOSPHATES
BARYONS
BORON COMPOUNDS
BORON PHOSPHATES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HYDRATION
INFRARED SPECTRA
IONIC CONDUCTIVITY
NUCLEONS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
PROTONS
SOLVATION
SPECTRA
STEAM
360603* -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM PHOSPHATES
BARYONS
BORON COMPOUNDS
BORON PHOSPHATES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HYDRATION
INFRARED SPECTRA
IONIC CONDUCTIVITY
NUCLEONS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
PROTONS
SOLVATION
SPECTRA
STEAM