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Metastable state in Hg1-xCdxTe crystals

Oleksandr Zakharyash 

National University "Lvivska Polytechnika", Bendera St. 12, Lviv UA-79013, Ukraine


Measurements of electrical and thermal parameters of Hg1-xCdxTe crystals in situ at the melting and crystallization processes and also measurements of inner friction at their deformation process were performed.
Effects of heal releasing have been shown on temperature dependencies of Hg1-xCdxTe, CdTe and HgTe crystals thermal capacities.
These effects manifested themselves in the absolute thermal capacity values decreasing for the crystal specimens and ingots after the thermal treatments of the corresponding regimes.
Investigation results unequivocally indicate the thermal instability of the crystals.
Additional investigations with application of the inner friction method confirm conclusions about the predominate influence of nanodefect complexes and intergranular boundaries on the mechanical and thermal material parameters made on the base of the heat capacity investigation.
Anomaly high absorption of the elastic energy at the temperature 600K was shown. It decreased essentially at the specimen cooling.
Such inner fiction spectra change can testify the chemical composition change due to the processes on the intergranular boundaries.


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Presentation: poster at E-MRS Fall Meeting 2003, Symposium B, by Oleksandr Zakharyash
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-28 07:31
Revised:   2009-06-08 12:55