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Phase Transformations in Cd0.96Mn0.04Te0.98Se0.02 Solid Solutions

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Abstract

We have studied phase transformations in Cd0.96Mn0.04Te0.98Se0.02 solid solutions in the temperature range of 1080-1149 °C using differential thermal analysis (DTA). Following the "heating-dwell-cooling" procedure, we investigated the melt supercooling versus superheating, crystallization temperature versus dwell temperature, and crystallization rate versus crystallization temperature. We observed that the Cd0.96Mn0.04Te0.98Se0.02 alloy remained in a semi-liquid state over the dwell temperature range of 1089-1097 °C. Following a "heating-dwell-heating-cooling" procedure, we investigated the solid-phase volume fraction versus dwell temperature, melting temperature versus dwell temperature and melt crystallization rate versus dwell temperature. We observed that at dwell temperatures higher than 1097 °C, the solid phase completely disappeared in the sample, since the effect of melting was not observed, meaning that the sample was a single-phase melt. Despite the fact that the alloy was heated in every cycle up to 1147 ± 2 °C after the intermediate dwell, structural fragments formed during this intermediate dwell were still present even at higher temperatures and, as a result, affected the crystallization. The range of crystallization temperatures decreases with increasing intermediate dwell temperature. Such dependence can be interpreted as an alloy “memory” of its thermal history.

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Acknowledgments

This work was partially supported by a grant from the Simons Foundation (Award Number: 1030286, authors P. Fochuk and O. Kopach). One of the co-authors (R. B. James) was partially supported by the U.S. Department of Energy, NNSA Office of Defense Nuclear Nonproliferation Research and Development and NNSA Minority Serving Institutions Partnership Program. R. B. James also acknowledges support by Battelle Savannah River Alliance, LLC, under Contract No. 89303321CEM000080 with the U.S. Department of Energy. The publisher acknowledges the U.S. Government license to provide public access under the DOE Public Access Plan (http://energy.gov/downloads/doe-publicaccess-plan).

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Authors and Affiliations

  1. Yuriy Fedkovych Chernivtsi National University, Chernivtsi, Ukraine

    Oleh Kopach, Vasylyna Kopach & Petro Fochuk

  2. Brookhaven National Laboratory, Upton, NY, USA

    Aleksey Bolotnikov

  3. Savannah River National Laboratory, Aiken, SC, USA

    Ralph B. James

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  1. Oleh Kopach
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  2. Vasylyna Kopach
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  3. Petro Fochuk
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  4. Aleksey Bolotnikov
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  5. Ralph B. James
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Correspondence to Oleh Kopach.

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This invited article is part of a special tribute issue of the Journal of Phase Equilibria and Diffusion dedicated to the memory of Thaddeus B. “Ted” Massalski. The issue was organized by David E. Laughlin, Carnegie Mellon University; John H. Perepezko, University of Wisconsin–Madison; Wei Xiong, University of Pittsburgh; and JPED Editor-in-Chief Ursula Kattner, National Institute of Standards and Technology (NIST).

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Kopach, O., Kopach, V., Fochuk, P. et al. Phase Transformations in Cd0.96Mn0.04Te0.98Se0.02 Solid Solutions. J. Phase Equilib. Diffus. (2024). https://doi.org/10.1007/s11669-024-01116-9

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  • DOI: https://doi.org/10.1007/s11669-024-01116-9

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