Synthesis of Stoichiometric SrTiO3 and Its Carrier Doping from Air-Stable Bimetallic Complexes

Ebube E Oyeka; Daichi Oka; Eunsang Kwon; Tomoteru Fukumura

doi:10.1021/acs.inorgchem.0c03457

Synthesis of Stoichiometric SrTiO₃ and Its Carrier Doping from Air-Stable Bimetallic Complexes

Inorg Chem. 2021 Feb 1;60(3):1277-1283. doi: 10.1021/acs.inorgchem.0c03457. Epub 2021 Jan 21.

Authors

Ebube E Oyeka¹, Daichi Oka¹, Eunsang Kwon², Tomoteru Fukumura^{1

3}

Affiliations

¹ Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
² Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
³ Advanced Institute for Materials Research and Core Research Cluster, Tohoku University, Sendai 980-8577, Japan.

PMID: 33478216
DOI: 10.1021/acs.inorgchem.0c03457

Abstract

We demonstrate the synthesis of perovskite oxide SrTiO₃ with ideal cation stoichiometry and homogeneous La doping using air-stable Sr-Ti and La-Ti bimetallic peroxo complexes with a 1:1 cation ratio. Phase-pure SrTiO₃, La₂Ti₂O₇, and LaTiO₃ were successfully synthesized by thermal decomposition of those complexes. La-doped SrTiO₃ was obtained by mixing the Sr-Ti and La-Ti complexes in an acid solution, followed by thermal decomposition. La-doped SrTiO₃ showed systematic chemical trends in the lattice constant and electrical conduction. Not only those bulk polycrystals but also cation-stoichiometric SrTiO₃ epitaxial thin films were grown with an atomically flat surface from the Sr-Ti complex.