Some transport properties of the indium antimonide/nickel antimonide eutectic system

The eutectic InSb-NiSb system was found by Wilhelm and Weiss to containundirectionally orientated inclusion rods of NiSb in a matrix of InSb .The Hall coefficient , electrical conductivity and magnetoresistance havebeen investigated from 77°K to 6500K, while thermo-electric power and thermalconductivity measurements have been plotted from 3200K to 590oK, on samples cutso that the directional anisotropy could be examined. Of particular interest,a sample orientated so that the inclusion rods, current and magnetic field aremutually perpendicular changes its resistance by a factor 9 (at 7kg) at 300oK.Measurements well above 300oK show a general convergence of properties,while well below this temperature the samples become p-type , with electricalconductivity progressively falling .For rods parallel to the temperature gradient the thermo-electric powero - I 0 0 -I 0 decreases from l84fAV K at 320 K to l5~fAV K at 600 K, whereas rods parallelo -I t o the temperature gradient show a much sharper fall from 265;OV K tol 5~VoK-' at the same temperatures, accompanied by thermal conductivity valuesof lesser disparity.The size and distribution of the inclusions was probed by stereoscanelectron microscopy, giving average dimensions of length 2. 20p, anddiameter O. 72}J.The modifications in Hall effect and magnetoresistance brought about bythe inclusions can be explained by comparison with similar values obtainablefrom pure InSb samples of various geometries , while the thermo-electric powerand thermal conductivity can be explained by a model based on the nature of the inclusions.

Level dc:type.qualificationlevel

Doctoral (Level 8)

Year dc:date.issued

1970

Author dc:creator

• Harrington, J

Language dc:language

en

Identifier

oai:salford-repository.worktribe.com:1383055

OAI identifier oai:identifier

oai:salford-repository.worktribe.com:1383055