Titanium perovskite oxyhydrides ATiO3-xHx (A = Ba, Sr, Ca, Eu), prepared by topochemical reductions of corresponding oxides with calcium hydride, have shown novel chemical and physical properties including metallic conductivity and a labile nature of hydride allowing to access to various mixed anion oxides such as oxynitrides. To further improve these properties or explore new phenomena in the titanium oxyhydride perovskite, it is important to precisely control the hydride concentration x and possibly extend its solubility range. However, the solubility range appears to vary depending on various factors such as A-site cation and particle size. In this study, we use a strategy inspired by oxide ion-conductors in order to improve the anion exchange property. A ScIII-substituted SrTiIVO3, Sr(Ti1-xScx)O3-x/2 (x ≤ 0.1), is employed as a precursor for CaH2 reduction. We have observed that the introduction of only small anion vacancy significantly improves the anion exchangeability and successfully expands the solubility range. This observation highlights the importance of anion vacancy to improve anion (H–/O2–) diffusion and suggests that such a vacancy assisted reaction could be applied to other anion exchange reactions (e.g., F-/O2- and N3-/O2-) to extend a solubility range.&lt;div id="UMS_TOOLTIP" style="position: absolute; cursor: pointer; z-index: 2147483647; background-color: transparent; top: -100000px; left: -100000px; background-position: initial initial; background-repeat: initial initial;"&gt; &lt;/div&gt;

Promoted hydride/oxide exchange reaction in SrTiO3 by introduction of anion vacancy

255th National Meeting (2018)

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