The new double perovskite La3Co2TaO9 has been prepared by a solid-state procedure. The crystal and magnetic
structures have been studied from X-ray (XRPD) and neutron powder diffraction (NPD) data. Rietveld refinements were performed in the monoclinic space group P21/n. The structure consists of an ordered array of alternating B’O6
structures have been studied from X-ray (XRPD) and neutron powder diffraction (NPD) data. Rietveld refinements
were performed in the monoclinic space group P21/n. The structure consists of an ordered array of alternating B’O6
1/n. The structure consists of an ordered array of alternating B’O6and B”O6 octahedra sharing corners, tilted along the three pseudocubic axes according to the Glazer notation a-b-c+.
Rietveld refinements show that at RT the cell parameters are a = 5.6005(7) Å, b = 5.6931(7) Å, c = 7.9429(9) Å and
Rietveld refinements show that at RT the cell parameters are a = 5.6005(7) Å, b = 5.6931(7) Å, c = 7.9429(9) Å and
a = 5.6005(7) Å, b = 5.6931(7) Å, c = 7.9429(9) Å andβ = 89.9539(7)º, and the refined crystallographic formula can be written as La2(Co)2d(Co1/3Ta2/3)2cO6. Magnetization
measurements and low-temperature NPD data show that the perovskite is a ferromagnet with TC= 72K. At high T it
follows the Curie-Weiss law with an effective magnetic moment of 3.82μB per Co ion which is very close to spin only
Co2+ (HS).
measurements and low-temperature NPD data show that the perovskite is a ferromagnet with TC= 72K. At high T it
follows the Curie-Weiss law with an effective magnetic moment of 3.82μB per Co ion which is very close to spin only
Co2+ (HS).
follows the Curie-Weiss law with an effective magnetic moment of 3.82μB per Co ion which is very close to spin only
Co2+ (HS).
Co2+ (HS).
2+ (HS).