Electrolytic growth and preparations of transition metal compound single crystals. Technical summary report No. 1, 1 May 1966--30 April 1967

Technical Report · Sat Jul 01 00:00:00 EDT 1967

OSTI ID:7301270

Wold, A

Single crystals of NbSe/sub 2/ and WSe/sub 2/ were grown by a chemical transport technique. The conductivity of NbSe/sub 2/, which is metallic, varies from 5.5 ohm-cm at 300/sup 0/K to 28 ohm-cm at 100/sup 0/K. It has a superconducting transition temperature at 7/sup 0/K. WSe/sub 2/ is a p-type semiconductor--conductivity 0.72 ohm-cm at 298/sup 0/K and 120 ohm-cm at 77/sup 0/K. The thermoelectric figure of merit of Ta substituted WSe/sub 2/ is 0.0005/sup 0/K from 773/sup 0/K to 1273/sup 0/K. Single crystals of Fe(II)O.Fe/sub 2/(III)O/sub 3/ were grown by chemical transport utilizing HCl as the volatilizing agent. The crystals had an AO = 8.300A as determined by x-ray analysis. Other crystals which can be prepared electrolytically from a flux of MCl/sub 2/ and Mb/sub 407/ are boron, CaB/sub 6/, SrB/sub 6/, BaB/sub 6/, Yb/sub 6/, MnB, TiB/sub 2/, and TaB/sub 2/. Polycrystalline samples of TiSi/sub 2/, ZrSi/sub 2/, CrSi/sub 2/, and Fe/sub 2/Si can also be prepared by electrolyzing mixtures of alkali metal fluorosilicates and fluotitanates. However, these compounds have not been well-characterized.

• Research Organization: Brown Univ., Providence, RI (USA)
• OSTI ID: 7301270
• Report Number(s): AD-660615; AFML-TR-67-239
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
IRON OXIDES
CRYSTAL GROWTH
NIOBIUM SELENIDES
TUNGSTEN SELENIDES
CHEMICAL PREPARATION
MONOCRYSTALS
SUPERCONDUCTIVITY
CHALCOGENIDES
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IRON COMPOUNDS
NIOBIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SELENIDES
SELENIUM COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
360100* - Metals & Alloys