Single Crystal Growth of Beta-Al2O3 for Iso-Index Filters

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Abstract:

Single crystals of Beta-Al203 with a nominal composition of Na2O.11 Al203 were grown from stoichiometric melts contained in an iridium crucible. Seeding was achieved from an Al203 single crystal. The growth axis was along a and X-ray data confirmed the unit cell parameters of a 5.595 A and c 22.531 A. The top and bottom lattice constants of the boules were equal to 0.002 A and indicated a fairly uniform composition. The measured density was 3.25 gcm3. The boules remained physically intact with no major cracks. However some cleavage progressed on the basal planes as determined by the appearance of interference fringes. Water vapor and C02 did not enhance the cracking. Crystals were stored in a desiccator but continued to cleave. Ionic diffusions of Nal, Agl, Pb2, Rbl, Ca2, Cd2, TI l were performed by immersion Of Beta-Al203 into nitrate or chloride melts at temperatures of 360-7400C. The amount of exchange was Crystal Growth, Beta-Al2O3, Iso-Index filters.

Author(s):
Belt, R. F. ; Randles, M. H. ; Creamer, J. E.
Author Organization(s):
LITTON SYSTEMS INC CHARLOTTE NC AIRTRON DIV
Descriptive Note:
Final rept. 1 Aug 1990-1 Feb 1992
Pagination:
0039

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
N00014-90-C-0006, DARPA ORDER-7531
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_5.3.4_Develop Courses of Action; JCA_5.3.5_Analyze Courses of Action; JCA_5.3.3_Develop Strategy
Modernization Areas:
Microelectronics
Communities of Interest:
Advanced Electronics
Descriptor(s):
*SINGLE CRYSTALS, *ALUMINUM OXIDES, *FILTERS, *CRYSTAL GROWTH, DENSITY, TEMPERATURE, PARAMETERS, VAPORS, WATER, X RAYS, INTERFERENCE, CLEAVAGE, WATER VAPOR, ION EXCHANGE, IMMERSION, BOTTOM, EXCHANGE, CARBON DIOXIDE, INDEXES, CHLORIDES, SODIUM COMPOUNDS, CRUCIBLES, SEEDING, IRIDIUM, NITRATES, UNIFORMS, CONSTANTS, ELECTRICAL CONDUCTIVITY, CRYSTALS, CELLS, CRYSTAL LATTICES, CRACKS, MELTS
Field(s)/Group(s):
Inorganic Chemistry, Physical Chemistry, Crystallography
Keyword(s):
*ISO INDEX, BOULES, FRINGES, IONIC DIFFUSION, SUPERIONIC CONDUCTORS
Report Date:
1992 Mar 31