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Purification and Crystal Growth of Lead Iodide by Physical Vapor Transport MethodLead iodide (PbI2) is a layered compound semiconductor being developed as room temperature x- and gamma-ray detector. Compared to the more studied material, mercuric iodide, PbI2 has a higher melting temperature and no phase transition until liquid phase which are indications of better mechanical properties. In this study, the source material was purified by the zone-refining process, and the purest section was extracted from center of the the zone-refined ingot to be grown by physical vapor transport (PVT) method. The zone-refined material and as-grown crystals were characterized by optical microscopy and differential scanning calorimetry (DSC) to reveal the surface morphology, purity and stoichiometry. The results shows that both materials are near-stoichiometric composition, with the purity of the as-grown crystals higher than zone-refined materials. The resistivity of the as-grown crystal (10" Omega-cm) was derived from current-voltage (I-V) measurement, and is 10 times higher than the zone-refined materials. Detail results will be presented and discussed.
Document ID
20000032247
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Wright, G. W.
(Fisk Univ. Nashville, TN United States)
Cole, M.
(Fisk Univ. Nashville, TN United States)
Chen, Y.-F.
(Fisk Univ. Nashville, TN United States)
Chen, K.-T.
(Fisk Univ. Nashville, TN United States)
Chen, H.
(Fisk Univ. Nashville, TN United States)
Chattopadhyay, K.
(Fisk Univ. Nashville, TN United States)
Burger, A.
(Fisk Univ. Nashville, TN United States)
Date Acquired
August 19, 2013
Publication Date
February 22, 1998
Publication Information
Publication: NASA University Research Centers Technical Advances in Aeronautics, Space Sciences and Technology, Earth Systems Sciences, Global Hydrology, and Education
Volume: 2 and 3
Subject Category
Solid-State Physics
Funding Number(s)
CONTRACT_GRANT: NAGW-2925
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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