In transition metal (M) compounds, the partial substitution of the host transition metal (M) to guest one (M) is effective to improve the functionality. To microscopically comprehend the substitution effect, degree of distribution of M is crucial. Here, we propose that a systematic EXAFS analysis against the M concentration can reveal the spatial distribution of M. We chose NaCoFeO as a prototypical M compound and investigated the local intermetal distance around the guest Fe [d(x)] against Fe concentration (x). d(x) steeply increased with x, reflecting the larger ionic radius of high-spin Fe. The x-dependence of d(x) was analyzed by an empirical equation, [Formula: see text], where d and d are the Fe-Fe and Co-Fe distances, respectively. The parameter s represents degree of distribution of Fe; s = 1, > 1, < 1 are for random, attractive, and repulsive distribution, respectively. The obtained s value (= 4.8) indicates aggregation tendency of guest Fe.
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| http://dx.doi.org/10.1038/s41598-020-68147-3 | DOI Listing |
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