High pressure charge transitions in PbCoO3

DOI

PbCoO3 used to be the “missing link” in the PbMO3 perovskite series. PbCoO3 was recently synthesized by the Azuma group using high-pressure synthesis at 12 GPa. NPD at JPARC shows that it has the exciting and unexpected valence distribution of Pb2+Pb4+3Co2+2Co3+2O12 where Pb in the A-site and Co in the B-site of perovskite ABO3 both have charge ordering leading to the so-called A-site ordered double perovskite structure. The complex Pb2+0.25Pb4+0.75Co2+0.5Co3+0.5O3 valence distribution is expected to change with perturbations such as pressure and chemical modifications. A preliminary high pressure SXRD experiment found a 0.5 % volume drop at 5 GPa. We think that this corresponds to a Pb-Co charge transfer, but it needs to be confirmed by NPD. We request 3 days on PEARL for an initial room temperature experiment from near ambient up to 10 GPa pressure.

Identifier
DOI https://doi.org/10.5286/ISIS.E.82355214
Metadata Access https://icatisis.esc.rl.ac.uk/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatisis.esc.rl.ac.uk:inv/82355214
Provenance
Creator Mr Hajime Yamamoto; Professor Masakai Azuma; Mr Kengo Oka; Professor Paul Attfield; Dr Yuki Sakai; Dr Nicholas Funnell; Mr Takumi Nishikubo; Mr Takeshi Asakura; Mr Yuichito Hattori; Mr Calum Lithgow
Publisher ISIS Neutron and Muon Source
Publication Year 2019
Rights CC-BY Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Contact isisdata(at)stfc.ac.uk
Representation
Resource Type Dataset
Discipline Photon- and Neutron Geosciences
Temporal Coverage Begin 2016-10-10T09:00:00Z
Temporal Coverage End 2016-10-14T09:00:00Z