| Records |
| Author |
Franco, D.G.; Carbonio, R.E.; Nieva, G. |
| Title |
Magnetic Properties of the Double Perovskites LaPbMSbO6 (M = Mn, Co, and Ni) |
Type |
Journal Article |
| Year |
2013 |
Publication |
IEEE Transactions on Magnetics |
Abbreviated Journal |
IEEE Trans. Magn. |
| Volume |
49 |
Issue |
8 |
Pages |
4594-4597 |
| Keywords |
X-ray diffraction; cobalt compounds; lanthanum compounds; lead compounds; magnetisation; manganese compounds; nickel compounds; paramagnetic-antiferromagnetic transitions; space groups; superexchange interactions; LaPbCoSbO6; LaPbMnSbO6; LaPbNiSbO6; M2+ distribution; Rietveld analysis; Sb5+ distribution; X-ray powder diffraction pattern; antiferromagnetic coupling; antiferromagnetic transition; aqueous synthetic route; disorder; double perovskites; ferrimagnetic characteristics; interaction paths; magnetic ions; magnetic properties; monoclinic crystals; octahedral sites; polycrystals; space group P2 1/n; super-superexchange paths; Ions; Magnetic properties; Magnetization; Manganese; Nickel; Temperature measurement; X-ray diffraction; Antiferromagnetic materials; transition metal compounds |
| Abstract |
New double perovskites LaPbMSbO6, where M2+ = Mn2+, Co2+, and Ni2+, were synthesized as polycrystals by an aqueous synthetic route at temperatures below 1000 °C. All samples are monoclinic, space group P21/n, as it is observed from Rietveld analysis of X-ray powder diffraction patterns. The distribution of M2+ and Sb5+ among the two octahedral sites have 3% of disorder for M2+ = Ni2+, whereas for M2+ = Mn2+ and Co2+ less disorder is found. The three samples have an antiferromagnetic transition, due to the antiferromagnetic coupling between M2 + through super-superexchange paths M2+-O2--Sb5+-O2--M2+. Transition temperatures are low: 8, 10 and 17 K for Mn2+, Co2+, and Ni2 + respectively, as a consequence of the relatively long distances between the magnetic ions M2+. Besides, for LaPbMnSbO6 a small transition at 45 K was found, with ferrimagnetic characteristics, possibly as a consequence of a small disorder between Mn2+ and Sb5+. This disorder would give additional and shorter interaction paths: superexchange Mn2+-O2--Mn2+. |
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0018-9464 |
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BT @ pedrazp @ |
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669 |
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Gil, D.M.; Guimpel, J.; Paesano Jr., A.; Carbonio, R.E.; Gómez, M.I. |
| Title |
Y[Fe1−xCox(CN)6]·4H2O (0 ⩽ x ⩽ 1) solid solutions: Synthesis, crystal structure, thermal decomposition and spectroscopic and magnetic properties |
Type |
Journal Article |
| Year |
2012 |
Publication |
Journal of Molecular Structure |
Abbreviated Journal |
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| Volume |
1015 |
Issue |
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Pages |
112-117 |
| Keywords |
Y[Fe1−xCox(CN)6]·4H2O; Crystal structure refinement; Rietveld analysis; Infrared spectroscopy; Thermal decomposition |
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0022-2860 |
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BT @ jguimpel @ |
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645 |
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Gil, D.M.; Navarro, M.C.; Lagarrigue, M.C.; Guimpel, J.; Carbonio, R.E.; Gómez, M.I. |
| Title |
Crystal structure refinement, spectroscopic study and magnetic properties of yttrium hexacyanoferrate (III) |
Type |
Journal Article |
| Year |
2011 |
Publication |
Journal of Molecular Structure |
Abbreviated Journal |
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| Volume |
1003 |
Issue |
1-3 |
Pages |
129-133 |
| Keywords |
Hexacyanoferrate (III); Powder X-ray diffraction; Rietveld analysis; Infrared spectroscopy; Thermal analysis |
| Abstract |
Y[Fe(CN)6]·4H2O has been synthesized and characterized. The crystal structure was refined by Rietveld analysis using X-ray powder diffraction data. Y[Fe(CN)6]·4H2O crystallizes in the orthorhombic crystal system, space group Cmcm. Y3+ ion is eight-coordinated forming a bicapped distorted trigonal prism YN6O2. Fe3+ ion is six-coordinated in the form of an irregular octahedra FeC6 group and cyanide linkages between YN6O2 and FeC6 groups build an infinite polymeric array. The vibrational spectrum shows two bands corresponding to antisymmetric and symmetric stretching 12C14N in the CN stretching region. These bands are accompanied by four weak isotopic bands at lower frequency due to the presence of 13C and 15N in relative natural abundance. The HOH bending band split into three bands around 1600 cm−1 due to the presence of two kinds of water molecules in the structure. The thermal decomposition has been followed by thermogravimetric and differential thermal analysis, IR spectroscopy and powder XRD. The size and morphology of the complex and its thermal decomposition products were evaluated by scanning electron microscopy. The magnetic measurements confirm that Y[Fe(CN)6]·4H2O shows an antiferromagnetic order at low temperatures. |
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0022-2860 |
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BT @ jguimpel @ |
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607 |
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