Frey, Friedrich; Jagodzinski, H.; Prandl, W.; Yelon, W. B.
Dynamic character of the primitive to body-centered phase transition in anorthite.
In: Physics and Chemistry of Minerals, Vol. 1, No. 2: pp. 227-231
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We show from elastic neutron diffraction data that anorthite CaAl2Si2O8 (An100) undergoes a primitive to body-centered phase transition at Tc=237±1°C. The transition is reversible, and Tc is well defined. Our measurements demonstrate that the I-lattice at the high temperature phase applies to all structural elements; in other words, the time-averaged lattice is exactly body-centered and not just in the space average of An100, as concluded earlier by other authors.