BaCoO2+δ: a new highly oxygen deficient perovskite-related phase with unusual Co coordination obtained by high temperature reaction with short reaction times

Aamir Iqbal Waidha; Hongbin Zhang; Maren Lepple; Supratik Dasgupta; Lambert Alff; Peter Slater; A. D. Fortes; Oliver Clemens

doi:10.1039/C8CC09532A

BaCoO_2+δ: a new highly oxygen deficient perovskite-related phase with unusual Co coordination obtained by high temperature reaction with short reaction times†

Aamir Iqbal Waidha,

^a Hongbin Zhang,^b Maren Lepple,

^c Supratik Dasgupta,^d Lambert Alff,^d Peter Slater,

^e A. D. Fortes

^f and Oliver Clemens

*^ag

Author affiliations

* Corresponding authors

^a Technische Universität Darmstadt, Institut für Materialwissenschaft, Fachgebiet Material design durch Synthese, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
E-mail: oliver.clemens@md.tu-darmstadt.de

^b Institute of Materials Science, TU Darmstadt, 64287 Darmstadt, Germany

^c Technische Universität Darmstadt, Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Alarich-Weiss-Straße 12, 64287 Darmstadt, Germany

^d Technische Universität Darmstadt, Institut für Materialwissenschaft, Fachgebiet Dünne Schichten, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany

^e University of Birmingham, School of Chemistry, Edgbaston, Birmingham B15 2TT, UK

^f ISIS Facility, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, UK

^g Karlsruher Institut für Technologie, Institut für Nanotechnologie, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein Leopoldshafen, Germany

Abstract

A new highly oxygen deficient metastable modification of perovskite-related BaCoO_2+δ (δ ∼ 0.01–0.02) has been prepared using high temperature reactions with short heating times. This defect rich compound has at least partially square planar coordination of the Co²⁺ ions, a highly unusual coordination environment for Co. Low temperature neutron powder diffraction showed a G-type antiferromagnetic ordering, confirmed by SQUID magnetic measurements, which indicate a high Néel temperature of 220 K. This work shows how novel defective phases can be synthesized by exploiting short reaction times in solid state synthesis, thus offering an alternative route for new materials synthesis.

This article is part of the themed collection: Perovskites

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Article information

DOI: https://doi.org/10.1039/C8CC09532A
Article type: Communication
Submitted: 30 Nov 2018
Accepted: 07 Feb 2019
First published: 07 Feb 2019

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Chem. Commun., 2019,55, 2920-2923

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BaCoO_2+δ: a new highly oxygen deficient perovskite-related phase with unusual Co coordination obtained by high temperature reaction with short reaction times

A. I. Waidha, H. Zhang, M. Lepple, S. Dasgupta, L. Alff, P. Slater, A. D. Fortes and O. Clemens, Chem. Commun., 2019, 55, 2920 DOI: 10.1039/C8CC09532A

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