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The Rietveld method has been modified to incorporate line broadening from strains, particle size and microtwins. It has been applied to TiFeD1.9. The structure was determined to be orthorhombic [a0 = 7.0426 (2), b0 = 6.2371 (2), c0 = 2.8315 (1) Å] in space group Cmmm, in agreement with recent studies. The material is heavily twinned on the (110) planes with an average distance between twin planes of 24 Å.
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Thompson et al. (1989) studied this question.
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