Topotactic fluorination of perovskite strontium ruthenate thin films using polyvinylidene fluorideK. K. and A. C. conceived and designed the study. K. K., A. C., T. K., and T. O. performed the synthesis, XRD, XPS, and electrical resistivity measurements. D. O. and K. M. obtained the TEM images. A. C., T. O., and E. I. performed the synchrotron HAXPES measurements. K. K., Y. H., I. H., and D. S. conducted the ERDA measurements. All authors discussed the results. K. K., A. C., T. F. and T. H. wrot

We investigated the polyvinylidene fluoride (PVDF)-mediated topotactic fluorination of two perovskite ruthenate thin films with different crystallographic structures, non-layered perovskite SrRuO 3 and layered perovskite Sr 2 RuO 4 . While the former ruthenate did not react with PVDF, the latter was...

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Main Authors: Kawahara, K, Chikamatsu, A, Katayama, T, Onozuka, T, Ogawa, D, Morikawa, K, Ikenaga, E, Hirose, Y, Harayama, I, Sekiba, D, Fukumura, T, Hasegawa, T
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Language:English
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Summary:We investigated the polyvinylidene fluoride (PVDF)-mediated topotactic fluorination of two perovskite ruthenate thin films with different crystallographic structures, non-layered perovskite SrRuO 3 and layered perovskite Sr 2 RuO 4 . While the former ruthenate did not react with PVDF, the latter was fluorinated to form Sr 2 RuO 3 F 2 with a structure that exhibited a largely expanded c -axis. These results indicate that fluorine ions are preferentially inserted into the SrO rocksalt blocks in perovskite ruthenates, and that the oxygen atoms in the precursor oxide were partially removed upon fluorination. Finally, we noted that the Sr 2 RuO 3 F 2 film was insulating, with a resistivity of 4.1 × 10 Ω cm at 300 K. It should be noted that this resistivity is five orders of magnitude higher than that of the metallic Sr 2 RuO 4 film (6.7 × 10 −4 Ω cm). We fabricated a single-crystalline Sr 2 RuO 3 F 2 thin film by annealing a Sr 2 RuO 4 film with polyvinylidene fluoride.
ISSN:1466-8033
DOI:10.1039/c6ce02358d