Electronic properties and microstructure of Si76Ge23.95P0.05 alloys produced by mechanical alloying

Autor: W. Wunderlich, K. Pixius, W. Amend, J. Schilz
Rok vydání: 1994
Předmět:
Zdroj: Physica Status Solidi (a). 146:109-118
ISSN: 1521-396X
0031-8965
DOI: 10.1002/pssa.2211460110
Popis: High-energy ball-milled and hot-pressed silicon-germanium alloys are characterized for their microstructure and electronic properties in their different stages of production as a function of milling time. The analysis covers the characterization by X-ray diffractometry (XRD) (on both powders and compacts), the compositional examination by X-ray energy spectroscopy (EDS), macrostructural investigation by density and microhardness measurements, and finally the determination of the temperature-dependent conductivity. Milling is performed in agate vessels and a considerable wear of the milling media is found leading to a resistivity of more than 40 MΩ for milling times longer than 150 h. Otherwise the electronic properties do not depend upon processing time. Electronic properties of powder compacts can be either interpreted in terms of hopping conductivity for disordered systems in the high-temperature range of 100 to 300 K, or with fluctuations of the n-type doping level. The microstructural investigations reveal a concentration profile inside the grains from which it is concluded that solid-state diffusion plays a major role for a mechanically driven alloy formation.
Databáze: OpenAIRE
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