Abstract
This paper reports on the formation of metastable π phase on mechanical alloying of elemental Ag and Te powders in the composition range of 50 to 75 at. % Te. Contrary to the reported results in vapor-deposited thin films, no amorphous phase could be detected during mechanical alloying. The extent to which the π phase forms on milling is restricted, compared to rapid solidification. Formation of the metastable π phase coincides with the achievement of nanometric grain size and is preceded by the formation of intermetallic compound Ag2Te. An approximate estimation of the free energies of the competing phases has been attempted to provide insight into the phase selection process. It is suggested that tellurium diffusion through the nanoscale grain boundaries plays an important role in the formation of the metastable π phase.
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References
W. H. Beamer and L. R. Maxwell, J. Chem. Phys. 17, 1293 (1949).
C. C. Tsuei, H-C. Yen, and P. Duwez, Phys. Lett. 34A, 80 (1971).
T. Kikegawa and H. Iwasaki, Acta Crystallogr. Β 39, 158 (1983).
H.J. Beister, K. Strossner, and K. Syassen, Phys. Rev. B 41, 5535 (1990).
T.N. Kolobyanina, S. S. Kabalkina, L.F. Vereschagin, and L. V. Fedina, Sov. Phys. JETP 28, 88 (1969).
H.L. Luo and W. J. Klement, J. Chem. Phys. 36, 1870 (1962).
B.C. Geissen, U. Wolff, and N. J. Grant, Trans. AIME 242, 597 (1968).
W.L. Johnson and S. J Poon, J. Appl. Phys. 45, 3683 (1974).
K-J. Range, M. Zabel, F. Rau, F. von Krziwanek, R. Marx, and B. Panzer, Angew Chem. Int. Ed. Engl. 21, 706 (1982).
J.D. Joannopoulos, Proc. Int. Conf. on The Physics of Selenium and Tellurium, Konigstein, Federal Republic of Germany, edited by E. Gerlach and P. Grosse (1979), p. 2.
J.J. Hauser, J. Appl. Phys. 53, 3634 (1982).
H.J. Fecht, G. Han, Z. Fu, and W.L. Johnson, J. Appl. Phys. 67, 1744 (1990).
J. Eckert, L. Schultz, and K. Urban, Mater. Sci. Eng. A133, 393 (1991).
C.C. Koch, O.B. Cavin, C.G. McKamay, and J.O. Scorbrough, Appl. Phys. Lett. 43, 1017 (1983).
K. Uenishi, K.F. Kobayashi, K.N. Ishihara, and P.H. Shingu, Mater. Sci. Eng. A 134, 1342 (1991).
C. Jacob, Ph.D. Thesis, I.I.Sc, Bangalore, India (1993).
I. Karakaya and W. T. Thompsons, J. Phase Equilibria 12, 56 (1991).
1. Barin, O. Knacke, and O. Kubaschewski, Thermochemical Properties of Inorganic Substances (supplement) (Springer-Verlag, Berlin, 1977).
A. S. Abbasov and F. M. Mustafaev, Khim. Suyaz Krist. Poluprovodn. Polimet, 235 (1973).
T. Takahashi and O. Yamamoto, J. Electrochem. Soc. 117, 1 (1970).
A.R. Yavari, Mater. Sci. Eng. A179/A180, 20 (1994).
A. R. Miedema, P. F. de Chatel, and F. R. de Boer, Physica 100B, 1 (1980).
G. Parthasarathy and W.B. Holzapfel, Phys. Rev. Β 37, 8499 (1988).
L. Kaufman and H. Bernstein, Computer Calculation of Phase Diagrams, (Academic Press, New York, 1970), p. 46.
U. Gosele and K. N. Tu, J. Appl. Phys. 53 (4), 3252 (1982).
J. J. Hauser, in Proc. 9th Int. Conf. on Cryst. and Amor. Semicond., Grenoble, France, J. de. Phys. (Paris) 42, C4-943 (1981).
Y. Hirota, T. Isshiki, K. Okashita, and M. Shiojiri, J. Cryst. Growth 112, 55 (1991).
J. Horvath, R. Birringer, and H. Gleiter, Solid State Commun. 62, 319 (1987).
Chr. Herzig, J. Geise, and Yu. Mishin, Acta. Metall. Mater. 41, 1683 (1993).
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Chitralekha, J., Raviprasad, K., Gopal, E. et al. Formation of metastable π phase in mechanically alloyed tellurium-rich Ag–Te alloys. Journal of Materials Research 10, 1897–1904 (1995). https://doi.org/10.1557/JMR.1995.1897
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DOI: https://doi.org/10.1557/JMR.1995.1897