English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

New Antiferromagnetic Perovskite CaCo3V4O12 Prepared at High-Pressure and High-Temperature Conditions

MPS-Authors
/persons/resource/persons126681

Kasinathan,  D.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126888

Tsirlin,  A. A.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

Locator
There are no locators available
Fulltext (public)
There are no public fulltexts available
Supplementary Material (public)
There is no public supplementary material available
Citation

Ovsyannikov, S. V., Zainulin, Y. G., Kadyrova, N. I., Tyutyunnik, A. P., Semenova, A. S., Kasinathan, D., et al. (2013). New Antiferromagnetic Perovskite CaCo3V4O12 Prepared at High-Pressure and High-Temperature Conditions. Inorganic Chemistry, 52(20), 11703-11710. doi:10.1021/ic400649h.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-1E3C-9
Abstract
A new perovskite, CaCo32+V44+O12, has been synthesized at high-pressure and high-temperature (HP-HT) conditions. The properties of this perovskite were examined by a range of techniques. CaCo3V4O12 was found to adopt a double-perovskite cubic lattice [a = 7.3428(6) A] with Im (3) over bar symmetry. We have established that this new perovskite is stable at ambient conditions, and its oxidation and/or decomposition at ambient pressure begins above 500 degrees C. It undergoes an abrupt antiferromagnetic transition around 98 K. Electrical resistivity data suggest semimetallic conductivity in the temperature range of 1.6-370 K. We have established that the Co2+ ions in CaCo3V4O12 are in the high-spin state with a sizable orbital moment, even though their square-planar oxygen coordination could be more suitable for the low-spin state, which is prone to Jahn-Teller distortion. Electrical resistivity curves also exhibit a distinct steplike feature around 100 K. CaCo3V4O12 is a first example of perovskite in which the sites A' are fully occupied by Co2+ ions, and hence its synthesis opens the door to a new class of double perovsldtes, ACo(3)B(4)o(12), that may be derived by chemical substitution of the A sublattice by lanthanides, sodium, strontium, and bismuth and by other elements and/or of the B sublattice by some other transition metals.