Controlling the crystallization and magnetic properties of melt-spun Pr2Fe14B/α-Fe nanocomposites by Joule heating

Jin, Z. Q.; Cui, B. Z.; Liu, J. P.; Ding, Y.; Wang, Z. L.; Thadhani, N. N.
May 2004
Applied Physics Letters;5/31/2004, Vol. 84 Issue 22, p4382
Academic Journal
Pr2Fe14B/α-Fe based nanocomposites have been prepared through crystallization of melt-spun amorphous Pr7Tb1Fe85Nb0.5Zr0.5B6 ribbons by means of ac Joule heating while simultaneously monitoring room-temperature electrical resistance R. The R value shows a strong variation with respect to applied current I, and is closely related to the amorphous-to-nanocrystalline phase transformation. The curve of R versus I allows one to control the crystallization behavior during Joule heating and to identify the heat-treatment conditions for optimum magnetic properties. A coercivity of 550 kA/m and a maximum energy product of 128 kJ/m3 have been obtained upon heating the amorphous ribbons at a current of 2.0 A. These properties are around 30% higher than the values of samples prepared by conventionally (furnace) annealed amorphous ribbons. © 2004 American Institute of Physics.


Related Articles

  • Off-diagonal magnetoimpedance in field-annealed Co-based amorphous ribbons. Buznikov, N. A.; CheolGi Kim; Chong-Oh Kim; Lan Jin; Seok-Soo Yoon // Journal of Applied Physics;12/1/2005, Vol. 98 Issue 11, p113908 

    The off-diagonal magnetoimpedance in field-annealed CoFeSiB amorphous ribbons was measured in the low-frequency range using a pickup coil wound around the sample. The asymmetric two-peak behavior of the field dependence of the off-diagonal impedance was observed. The asymmetry is attributed to...

  • Differential Thermal Analysis of Liquid Quenched Co-B Alloys. Rizvi, S. Dabir H.; Rizvi, Shabana // International Journal of Natural & Engineering Sciences;May2010, Vol. 4 Issue 2, p15 

    Differential Thermal Analysis (DTA) was performed on four samples of liquid quenched amorphous Co-B alloys, up to a temperature of 1000C, well above crystallization temperature of the four alloys. Phase transition study for the four samples were undertaken and the results were found in agreement...

  • Resistivity measurements and Crystallization of Phases in a Series of Co100-x-Bx Metallic Glasses. Rizvi, Shabana; Rizvi, S. Dabir H. // International Journal of Natural & Engineering Sciences;May2010, Vol. 4 Issue 2, p19 

    A systematic study of electrical resistivity of a series of Co100-xBx, where x=30, 29, 27, 25, 24, 23, 21.5 and 20.5, amorphous alloys in the temperature range of 300 to1000 K was undertaken. The analysis of data established step-wise crystallization. It has been of particular interest to study...

  • Shock Compression Induced Devitrification of Amorphous Ce3Al Melt-Spun Ribbons. Bryant, Alex W.; Wehrenberg, Chris; Alamgir, Faisal; Lai, Samson Y.; Remington, Bruce; Thadhani, Naresh N. // AIP Conference Proceedings;2017, Vol. 1793 Issue 1, p1 

    Shock compression experiments were performed on amorphous Ce3Al melt-spun ribbons using the 50 J laser shock loading system at the Omega laser facility. A multi-layered sample of 2mm total thickness with 1 mm x 1.5 mm width and 40 μm thick ribbons sandwiched with 6 μm epoxy was used as the...

  • Computer Simulation of Crystal Structure Formation upon Transition from Amorphous State. Lagunov, V. A.; Sinani, A. B. // Physics of the Solid State;Jun2000, Vol. 42 Issue 6, p1120 

    The structure of a solid has been studied by the molecular dynamics technique upon transition from the amorphous state to the crystalline state. The influence of initial conditions in the simulation of an amorphous sample and the temperature of its heating on the resulting structure is examined....

  • A study of temperature dependent ε[sup ″](ω) in amorphous ferroelectrics: Mode coupling theory analysis. Hwang, Yoon-Hwae; Kim, Suhwan; Oh, Jiyoung // AIP Conference Proceedings;2000, Vol. 519 Issue 1, p170 

    We analysed the imaginary part of frequency dependent dielectric constant ∈' (ω) of amorphous LiNbO[sub 3] at temperatures below the crystallization using the Mode coupling theory(MCT). We found that ion transportation behavior in amorphous LiNbO[sub 3]can be explained well by the MCT...

  • Examining the role of fluctuations in the early stages of homogenous polymer crystallization with simulation and statistical learning. Welch, P. M. // Journal of Chemical Physics;2017, Vol. 146 Issue 4, p1 

    We propose a relationship between the dynamics in the amorphous and crystalline domains during polymer crystallization: the fluctuations of ordering-rate about a material-specific value in the amorphous phase drive those fluctuations associated with the increase in percent crystallinity. This...

  • The effect of Cr on the electrical resistivity of amorphous Fe75P16B6Al3. Gudmundsson, H.; Hannesson, H. J.; Åström, H. U. // Journal of Applied Physics;4/15/1985, Vol. 57 Issue 8, p3523 

    Deals with a study which examined the effect of chromium on the electrical resistivity of amorphous Fe[sub75]P[sub16]B[sub6]Al[sub3]. Experimental details; Results and discussion; Conclusion.

  • Electrical resistivity of liquid binary and ternary alloys. Ornat, M.; Paja, A. // Applied Physics A: Materials Science & Processing;Feb2011, Vol. 102 Issue 2, p379 

    New method of calculation of the electrical resistivity of liquid and amorphous alloys is presented. The method is based on the Morgan-Howson-S̆aub (MHS̆) model but the pseudopotentials are replaced by the scattering matrix operators. The Fermi energy is properly determined by the...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics