Magnetic structure and properties of the Na2CoP2O7 pyrophosphate cathode for sodium-ion batteries: a super-superexchange driven non-collinear antiferromagnet
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ArticleAbstract
The crystal and magnetic structure and properties of the Na2CoP2O7 sodium-ion battery cathode material have been characterized by magnetic susceptibility, specific heat, and variable temperature neutron powder diffraction measurements. Na2CoP2O7 crystallizes in the orthorhombic ...
See moreThe crystal and magnetic structure and properties of the Na2CoP2O7 sodium-ion battery cathode material have been characterized by magnetic susceptibility, specific heat, and variable temperature neutron powder diffraction measurements. Na2CoP2O7 crystallizes in the orthorhombic space group Pna21 with a = 15.4061(3) Å, b = 10.28854(9) Å and c = 7.70316(15) Å, having a layered structure with slabs of [CoP2O7]∞ separated by Na cations. The magnetic property measurements and neutron diffraction data analysis reveal that the material undergoes long-range ordering to a non-collinear antiferromagnetic G-type structure below TN ~ 6.5 K. The magnetic structure is rationalized as a result of super-superexchange between Co2+ atoms linked by phosphate groups.
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See moreThe crystal and magnetic structure and properties of the Na2CoP2O7 sodium-ion battery cathode material have been characterized by magnetic susceptibility, specific heat, and variable temperature neutron powder diffraction measurements. Na2CoP2O7 crystallizes in the orthorhombic space group Pna21 with a = 15.4061(3) Å, b = 10.28854(9) Å and c = 7.70316(15) Å, having a layered structure with slabs of [CoP2O7]∞ separated by Na cations. The magnetic property measurements and neutron diffraction data analysis reveal that the material undergoes long-range ordering to a non-collinear antiferromagnetic G-type structure below TN ~ 6.5 K. The magnetic structure is rationalized as a result of super-superexchange between Co2+ atoms linked by phosphate groups.
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Date
2013Source title
Inorganic ChemistryVolume
52Publisher
American Chemical SocietyFunding information
ARC DP110102662Faculty/School
Faculty of Science, School of ChemistryShare