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Gonçalves, António Pereira
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Publications (3/3 displayed)
- 2017Effect of Isovalent Substitution on the Electronic Structure and Thermoelectric Properties of the Solid Solution α‑As2Te3−xSex (0 ≤ x ≤ 1.5) citations
- 2011Microstructures and magnetic domain configurations of NdFe11Ti and Nd2(Fe,Ti)17 aggregatescitations
- 2009Magnetic microstructure of YFe11Ti aggregatescitations
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article
Microstructures and magnetic domain configurations of NdFe11Ti and Nd2(Fe,Ti)17 aggregates
Abstract
<p>Nd:11Fe:Ti alloys produced by arc melting and splat quenching have been investigated by scanning electron microscopy, transmission electron microscopy, magnetic force microscopy and magnetic measurements. Both the as-cast and splat-quenched materials crystallized adopting essentially the ThMn <sub>12</sub>-type structure. However, the RFe<sub>11</sub>M (where R is a rare-earth element and M is an early 3d element or other non-magnetic element) stoichiometry was not strictly followed and α-Fe(Ti) and Nd <sub>2</sub>(Fe,Ti)<sub>17</sub> could be detected in the microstructures. Magnetic force microscopy showed that the critical size for single-domain behavior in the splat-quenched aggregates was close to 100 nm. Annealing treatments induced a NdFe<sub>11</sub>Ti → Nd<sub>2</sub>(Fe,Ti) <sub>17</sub> + α-Fe(Ti) + Fe<sub>2</sub>Ti reaction. Transmission electron microscopy investigations showed that this solidstate transformation produced a fine intergrowth of the two ternary rare-earth compounds with a specific crystallographic orientation relation. The lower saturation magne-tization of the splat/annealed condition as compared to the splat-quenched condition may reflect the disorderly intergrown Nd<sub>2</sub>(Fe,Ti) <sub>17</sub>phase in NdFe<sub>11</sub>Ti. On the other hand the higher coercivity obtained for the splat-quenched condition seems related to the smaller scale of the microstructure due to a possible, albeit weak, pinning effect by the grain boundaries.</p>