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. 2015 Jul 20;6:7584. doi: 10.1038/ncomms8584

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(a) Skutterudite lattice expansion due to Ce filling. (b) Dependence of FFL on annealing temperature. Red dashed line is a guide for the eye. Error bars represent the s.d. of filling fraction limit determined from EPMA measurements. (c) Dependence of FFL on nominal composition with annealing temperature 973 K.