| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-2063 - C8-2064 | |
| DOI | https://doi.org/10.1051/jphyscol:19888935 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-2063-C8-2064
DOI: 10.1051/jphyscol:19888935
1 Laboratoire de Chimie du Solide du CNRS, Université de Bordeaux I, 33405 Talence, France
2 Facultad de Ciencias, UPV, BILBAO, Spain
J. Phys. Colloques 49 (1988) C8-2063-C8-2064
DOI: 10.1051/jphyscol:19888935
MAGNETIC BEHAVIOR OF Co2+ IONS IN SYNTHETIC MINERALS RELATED TO VIVIANITE AND LUDLAMITE
J. L. Pizarro1, L. Lezama1, G. Villeneuve1, M. I. Arriortua2 et T. Rojo21 Laboratoire de Chimie du Solide du CNRS, Université de Bordeaux I, 33405 Talence, France
2 Facultad de Ciencias, UPV, BILBAO, Spain
Abstract
Members of the family of mineral vivianite Fe3 (PO4)2 -8H2O, and ludlamite Fe3 (PO4)2 -4H2O involving Co2+ ions have been synthetized. Co3 (PO4)2 -8H2O exhibits an antiferromagnetic ordering at 6.5 K, the nature of the interactions are discussed with respect to its crystal structure. Using hydrothermal conditions tetra and dihydrate were obtained. The ferrimagnetism observed for the tetrahydrate may be related to the ludlamite structure. A spin-flop is observed for the dihydrate at a critical field of 1 kG.