Crystallite size determinations for melt-spun FeNdB permanent magnet alloys

Correlation of Crystalline Structure with Magnetic and Transport Properties of Glass-Coated Microwires

“…The other peculiarity of studied as-prepared Cu 95 Co 5 and Cu 90 Co 10 samples is that surprisingly they present well-defined resistivity minimum at rather high temperature (about 50 K for Cu 90 Co 10 , see Figure 24). This minimum is affected by applied magnetic field, but in as-prepared sample can be totally suppressed by rather strong magnetic field (about 70 kOe).…”

“…On the other hand, rapid quenching from the melt and subsequent processing is a well-established route to the formation of hard magnetic materials [95].…”

Structures and magnetic properties of Nd–Fe alloys produced by the glass slag method

“…However, the existence of the hard magnetic Nd 2 Fe 14 B phase did not result in a significant increase in the coercivity. It has been reported that the coercivity of the Nd-Fe-B alloy is deeply dependent on the grain size and that Nd-Fe alloys with very fine Nd 2 Fe 14 B phase show a high coercivity [15]. The smaller amount and larger size of the Nd 2 Fe 14 B phase in the specimen gave rise to the observed low coercivity even though the specimen contained some hard magnetic Nd 2 Fe 14 B phase.…”

Structures and magnetic properties of Nd–Fe–Ti alloys produced by melt-spinning technique

“…The melt-spun ribbon with the Nd 3 (Fe,Ti) 29 phase, obtained by annealing at 1173 K, shows a lower coercivity than that with a mixture of the ␣-Fe, Nd 3 (Fe,Ti) 29 and Nd 2 (Fe,Ti) 17 phases, where the crystallite size of the Nd 3 (Fe,Ti) 29 phase is relatively small. This implies that the coercivity of the Nd 3 (Fe,Ti) 29 phase is dependent on the crystallite size, as is the case for the hard magnetic Nd 2 Fe 14 B phase of Nd-Fe-B alloys [12]. The saturation magnetization increases from 90 Am 2 kg −1 at 673 K to 180 Am 2 kg −1 at 873 K and then decreases as the annealing temperature increases further to a value of 120 Am 2 kg −1 at 1173 K. According to the results of the XRD studies, the existence of the ␣-Fe phase with a high saturation magnetization gives rise to the observed higher saturation magnetization of the melt-spun ribbons annealed at 773 and 873 K. The saturation magnetization of the melt-spun ribbon annealed at 1173 K, which consists of the Nd 3 (Fe,Ti) 29 phase, is found to be 120 Am 2 kg −1 .…”