The compositional dependence of the negative thermal expansion (NTE) property of Bi1−xLnxNiO3 (Ln = La, Nd, Eu, Dy) was investigated. All x = 0.05 samples showed large NTE over αL = −70 ppm/K (αL: coefficient of linear thermal expansion) due to intermetallic charge transfer between Bi5+ and Ni2+. The temperature range of NTE shifted upward with decreasing ionic radius of Ln3+. Partial ordering of Bi/Ln is suggested to be the origin of this shift and the suppression of the broadening of the transition.
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Oka et al. (2013) studied this question.
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