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Tem Studies of Some Structurally Flexible Solids and Their Associated Phase Transformations

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In-Situ Microscopy in Materials Research

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Abstract

There exist many crystalline “line” phases in a wide variety of chemical systems characterized by well-defined and essentially invariant stoichiometries and atomic positions in a conventional three dimensional unit cell, and whose structures apparently represent a unique dominant minimum in local free energy space. Equally, however, there also exists a wide variety of solid state systems whose chemistry and/or crystallography is inherently rather more flexible [1–5]. Such compositionally and/or displacively flexible systems are characterized by an intrinsic ability to exist over a broad range of temperature, pressure, composition etc. without having to undergo major reconstructive structural phase transformation. Examples are provided by wide range non-stoichiometric (1−x)MO2.xRO1.5 (M=Ce,Zr; R=lanthanide) anion-deficient fluorite type solid solutions [6–8] or the topologically equivalent family of SiO2-tridymite [9–11] polymorphs.

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  1. Research School of Chemistry, Australian National University, Canberra, A.C.T, 0200, Australia

    Ray L. Withers & John G. Thompson

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  1. Ray L. Withers
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  1. Central Research and Development, Science and Engineering Laboratories, DuPont, Experimental Station, Wilmington, Deleware, 19880-0356, USA

    Pratibha L. Gai

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Withers, R.L., Thompson, J.G. (1997). Tem Studies of Some Structurally Flexible Solids and Their Associated Phase Transformations. In: Gai, P.L. (eds) In-Situ Microscopy in Materials Research. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-6215-3_13

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