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01632 am a22001813u 4500 |
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|a Moze, O.
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|a Giovanelli, L.
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|a Kockelmann, W.
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|a de Groot, C.H.
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|a Boer, F.R. de
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|a Buschow, K.H.J.
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|a Magnetic properties of Tb<sub>2</sub>Co<sub>17-x</sub>Ga<sub>x</sub> compounds studied by magnetic measurements and neutron diffraction
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|c 1998-01.
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|u https://eprints.soton.ac.uk/256318/1/moze76.pdf
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|a The magnetic properties of Tb<sub>2</sub>Co<sub>17−<i style="">x</i></sub>Ga<i><sub>x</sub></i> compounds (<i>x</i>=1,3,5 and 7) were studied by means of neutron diffraction and magnetic measurements. The refinement results of the neutron powder diffraction patterns show that initially the Ga atoms occupy almost exclusively the 18h site in the rhombohedral Th<sub>2</sub>Zn<sub>17</sub> structure and presumably are responsible for the sign reversal of the Co sublattice anisotropy. For x≥3 the Ga atoms increasingly occupy the 6c and 18f sites at the cost of the 18h site that shows a decreasing Ga occupancy in this concentration range. The 9d site is completely avoided by the Ga atoms over the whole concentration range. The sign reversal of the Co sublattice anisotropy is attributed to filling of the 18h site with Ga. From magnetic measurements and neutron diffraction it is derived that the Co moment strongly decreases in size with Ga concentration. There is also a strong decrease of the Curie temperature with Ga concentration.
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