Structural and Magnetic Transitions in CaCo3 V4 O12 Perovskite at Extreme Conditions

Inorganic Chemistry
Sergey V OvsyannikovL S Dubrovinsky

Abstract

We investigated the structural, vibrational, magnetic, and electronic properties of the recently synthesized CaCo3V4O12 double perovskite with the high-spin (HS) Co2+ ions in a square-planar oxygen coordination at extreme conditions of high pressures and low temperatures. The single-crystal X-ray diffraction and Raman spectroscopy studies up to 60 GPa showed a conservation of its cubic crystal structure but indicated a crossover near 30 GPa. Above 30 GPa, we observed both an abnormally high "compressibility" of the Co-O bonds in the square-planar oxygen coordination and a huge anisotropic displacement of HS-Co2+ ions in the direction perpendicular to the oxygen planes. Although this effect is reminiscent of a continuous HS → LS transformation of the Co2+ ions, it did not result in the anticipated shrinkage of the cell volume because of a certain "stiffing" of the bonds of the Ca and V cations. We verified that the oxidation states of all the cations did not change across this crossover, and hence, no charge-transfer effects were involved. Consequently, we proposed that CaCo3V4O12 could undergo a phase transition at which the large HS-Co2+ ions were pushed out of the oxygen planes because of lattice compression. The antiferromag...Continue Reading

References

Feb 28, 2006·Inorganic Chemistry·Maxim Avdeev, Vladimir B Nalbandyan
Sep 15, 1944·Proceedings of the National Academy of Sciences of the United States of America·F D Murnaghan
Mar 4, 2008·Inorganic Chemistry·Hongping Xiang, Zhijian Wu
May 2, 2008·The Review of Scientific Instruments·Alexander KurnosovBeat H Zehnder
Sep 30, 2008·Inorganic Chemistry·Yuichi Shimakawa
Jan 9, 2009·Journal of the American Chemical Society·Cédric TasselEnric Canadell
Jun 24, 2010·Journal of the American Chemical Society·Kengo OkaYuichi Shimakawa
Mar 6, 2012·Inorganic Chemistry·Susana García-MartínPatrick M Woodward
Oct 24, 2012·Journal of the American Chemical Society·Shoubao ZhangYuichi Shimakawa
Jan 3, 2013·The Review of Scientific Instruments·I KantorL Dubrovinsky
Jan 3, 2013·Angewandte Chemie·Sergey V OvsyannikovLeonid Dubrovinsky
Jan 22, 2013·Inorganic Chemistry·Kentaro ShiroTetsuo Irifune
Oct 3, 2013·Inorganic Chemistry·Sergey V OvsyannikovAlexander E Karkin
Dec 18, 2013·Inorganic Chemistry·Yuichi ShimakawaPatrick M Woodward
Dec 18, 2013·Inorganic Chemistry·Yasuhide AkizukiKatsuhisa Tanaka
Jan 15, 2014·Journal of the American Chemical Society·Jin-Ming ChenLiu Hao Tjeng
Oct 29, 2014·Advanced Materials·Sergey V OvsyannikovLeonid Dubrovinsky
Dec 11, 2014·Inorganic Chemistry·Vlad Martin-DiaconescuSerena DeBeer
Feb 14, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·V C FuertesR E Carbonio
Apr 23, 2016·Nature Chemistry·Sergey V OvsyannikovLeonid S Dubrovinsky
Jun 18, 2016·Angewandte Chemie·Elena Solana-MadrugaJ Paul Attfield

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.