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| Home > Publications database > Melting and homogeneity in germanium–silicon alloys and a modified micro-manufactured assembly for stable high pressure and temperature measurements |
| Journal Article | DESY-2014-01620 |
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2014
Taylor and Francis
London [u.a.]
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Please use a persistent id in citations: doi:10.1080/08957959.2013.856896
Abstract: We present a modified assembly for high pressure and temperature measurements in a MAX80 press. Thedesigns include a T-shaped power coupler with a ring-shaped insulator, a precision made, all-in-one singlepiececrucible, with mirror-image located, flat-bottomed sample and pressure marker chambers, with pressfitlids and thermocouple insert in the middle of the crucible. These features facilitate assembly stability,reproducibility of in situ measurements, avoidance of chemical contamination, portability of assemblyand ease of sectioning for further analysis. These attributes are important in evaluating phase relations athigh pressure, especially where melting of the charge is investigated. While the cubic-diamond structuredsilicon–germanium system exhibits a complete solid solution, in practice, homogeneous solid solutionsare not readily accessible because of the considerable difference in temperature between the liquidusand solidus and concomitant segregation coefficients. We use our designs, for in situ X-ray diffractionmeasurements and melting of germanium–silicon alloys at high pressure for both a germanium-rich and asilicon-rich starting composition.
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