Abstract
High(C2/c)-low(P21/c) phase transition in clinoenstatite and pigeonite was successfully observed in situ at high temperatures for the first time under a transmission electron microscope. The phase transition was revealed to possess the characteristics of a first-order transition, due to the coexistence of both phases separated by the sharp interfaces and the nucleation-growth process. The diffusionless and time-independent reaction suggests that the transition occurs athermal-martensitically. Furthermore, the small or even negative thermal hysteresis and the interface motion suggest that the transition is not a typical type but a thermoelastic type of the martensitic transformation. This type of the transformation, studied extensively in metallurgy in relation to shape memory effect, is first recognized in rock-forming minerals.
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Shimobayashi, N., Kitamura, M. Phase transition in Ca-poor clinopyroxenes. Phys Chem Minerals 18, 153–160 (1991). https://doi.org/10.1007/BF00233998
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DOI: https://doi.org/10.1007/BF00233998