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Zone Refinement of Germanium Crystals

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Published under licence by IOP Publishing Ltd
, , Citation G Yang et al 2015 J. Phys.: Conf. Ser. 606 012014 DOI 10.1088/1742-6596/606/1/012014

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gang.yang@usd.edu

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1 Department of Physics, The University of South Dakota, Vermillion, SD 57069, USA

2 Department of Materials and Metallurgical Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701, USA

3 Metallurgical Engineer, North American Stainless, Ghent, KY formerly Research Assistant and MS Candidate, Department of Materials and Metallurgical Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701, USA

4 Mechanical Engineer, Applied Controls Equipment, Denver, CO formerly Research Assistant and BS Candidate, Department of Materials and Metallurgical Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701, USA

5 Metallurgical Engineer, Logan Aluminum, Lewisburg, KY formerly Research Assistant and MS Candidate, Department of Materials and Metallurgical Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701, USA

6 Technical Consultant, Wenatchee, WA formerly Research Assistant and MS Candidate, Department of Materials and Metallurgical Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701, USA

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1742-6596/606/1/012014

Abstract

Purification of commercial germanium with an impurity level of ∼1013-14 cm-3 was successfully conducted in two-step zone refining process under an undiluted high-purity hydrogen gas atmosphere. Results for the first step conducted in graphite boats yielded ingots with an impurity level of ∼1012 cm-3 near the center of the 60 cm long ingots. These center portions were collected and subsequently zone refined in a high purity quartz boat to reach a purity level of ∼1011 cm-3. The best material achieved in a one step process employing a carbon-coated quartz boat yielded material of purity 8×1011 cm-3.

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10.1088/1742-6596/606/1/012014