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  • AIP Publishing  (9)
  • 1
    Online Resource
    Online Resource
    Effect of phase composition on crystal texture formation in hot deformed nanocrystalline SmCo5 magnets
    AIP Publishing ; 2018
    In:  AIP Advances Vol. 8, No. 5 ( 2018-05-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 8, No. 5 ( 2018-05-01)
    Abstract: In the present study, bulk anisotropic nanocrystalline SmCo5 magnets were prepared by hot press and subsequent hot deformation method. Effect of phase composition on texture and magnetic properties are presented, based on which the mechanism of plastic deformation and texture formation during the hot deformation process is discussed. The SmCo5 magnets were prepared by hot deformation, excessive Sm of 2.5 wt% and 10 wt% was added to compensate the weight loss due to Sm evaporation. Our analyses reveal that the phase composition is one of the most important parameters that determine the texture of SmCo5 magnets. It is therefore suggested that the existence of 2:17 phase and its phase transformation undermined the crystal texture formation as well as the magnetic properties of nanocrystalline SmCo5 magnets.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5007658
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2583909-3
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  • 2
    Online Resource
    Online Resource
    Enhanced thermoelectric performance of Mg2Si0.4Sn0.6 solid solutions by in nanostructures and minute Bi-doping
    AIP Publishing ; 2013
    In:  Applied Physics Letters Vol. 103, No. 6 ( 2013-08-05)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 103, No. 6 ( 2013-08-05)
    Abstract: n-type Mg2(Si0.4Sn0.6)Bix (0 ≤ x ≤ 0.04) solid solutions with minute amounts of Bi were prepared by induction melting, melt spinning (MS), and spark plasma sintering (SPS) method, namely the non-equilibrium technique MS-SPS, using bulks of Mg, Si, Sn, Bi as raw materials; the phase components, microstructures as well as the thermoelectric properties were systematically investigated. The multiple localized nanostructures within the matrix containing nanoscale precipitates and mesoscale grains were formed, resulting in remarkably decreasing of lattice thermal conductivities, particularly for samples with the nanoscale precipitates having the size of 10–20 nm. Meanwhile, the electrical resistivity was reduced and the Seebeck coefficient was increased by Bi-doping, causing improved electrical performance for the Mg2(Si0.4Sn0.6)Bix (0 ≤ x ≤ 0.04) compounds. The dimensionless figure of merit ZT was significantly improved and the maximum value reaches 1.20 at 573 K for the Mg2(Si0.4Sn0.6)Bi0.03 sample, greatly higher than that of the non-doped samples.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4816971
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Magnetic properties and structure of bulk nanocrystalline Sm(CoCuFeZr)7.6 sintered magnet
    AIP Publishing ; 2009
    In:  Journal of Applied Physics Vol. 105, No. 7 ( 2009-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 105, No. 7 ( 2009-04-01)
    Abstract: Structure and magnetic properties were studied for Sm(Co0.74Cu0.12Fe0.1Zr0.04)7.6 nanocrystalline ball milled powders and bulk magnet consolidated via spark plasma sintering technique. The amorphous milling powders crystallize to TbCu7 structure or a mixture of Th2Zn17 and CaCu5 structures when annealed below or above 1023 K, respectively. The coercivity of the powders decreases from 1.27 to 0.56 T as the annealed temperature increases from 923 to 1223 K. The bulk magnet also exhibits a TbCu7 structure with an average grain size of 32 nm. Magnetic measurements show that the remanence is 0.49 T and the coercivity reaches as high as 1.42 T. The Mr/Ms ratio of 0.63 demonstrates the existence of intergrain exchange coupling among the nanograins. The magnet exhibits the coercivity of 0.27 T at 773 K.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3067860
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 4
    Online Resource
    Online Resource
    Structural and magnetic properties of bulk nanocrystalline Erbium metal
    AIP Publishing ; 2011
    In:  AIP Advances Vol. 1, No. 2 ( 2011-06-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 1, No. 2 ( 2011-06-01)
    Abstract: Bulk nanocrystalline Erbium metals were prepared via Spark Plasma Sintering (SPS) and subsequent annealing process. The nanocrystalline Er metals have the same hexagonal close packed structure as that of coarse-grained sample. Decrease in grain size results in remarkable changes in the three magnetic ordering temperatures of the nanocrystalline Er metal. At 5 K, the magnetization drops by 10.9%, while the coercivity increases by 4 times for nanocrystalline Er compared with those of coarse-grained sample. These results indicate the remarkable influence of the nanostructure on the magnetism of Er due to finite size effect.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.3580260
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 2583909-3
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  • 5
    Online Resource
    Online Resource
    Abnormal crystal structure stability of nanocrystalline Sm2Co17 permanent magnet
    AIP Publishing ; 2009
    In:  Applied Physics Letters Vol. 94, No. 2 ( 2009-01-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 94, No. 2 ( 2009-01-12)
    Abstract: Abnormal crystal structure stability is discovered in the single-phase nanocrystalline Sm2Co17 permanent magnet. Three kinds of crystal structures, namely the rhombohedral Th2Zn17-type (2:17 R), the hexagonal TbCu7-type (1:7 H), and the hexagonal Th2Ni17-type (2:17 H), are claimed to exist at room temperature in the Sm2Co17 alloy system. The strong dependence of the magnetic properties on the structure characteristics in the single-phase Sm2Co17 alloy is interpreted in view of the atom space occupancy and the exchange coupling between substructures especially in the nanocrystalline alloy.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3040316
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Structure and magnetic properties of bulk nanocrystalline SmCo7−xHfx sintered magnets
    AIP Publishing ; 2008
    In:  Journal of Applied Physics Vol. 103, No. 7 ( 2008-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 103, No. 7 ( 2008-04-01)
    Abstract: The structure and magnetic properties of the bulk nanocrystalline SmCo7−xHfx (x=0,0.1,0.2) magnets prepared using the spark plasma sintering technology were studied. SmCo7−xHfx magnet exhibits a single phase with the TbCu7-type structure. The Rietveld structure refinement results show that Hf prefers to occupy the 1a site, which in turn leads to an enhancement of the anisotropy field of the SmCo7 compounds. Microstructure analysis indicates that the average grains size is about 35nm. With increasing Hf contents from x=0 to 0.2, the coercivity increases from 0.89to2.08T. The coercivity of SmCo6.8Hf0.2 magnet decreases almost linearly from 2.08to0.4T with increasing temperatures from 300to773K.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2830557
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 7
    Online Resource
    Online Resource
    Mössbauer spectroscopy study on the magnetic transition in Mn1.1Fe0.9P0.8Ge0.2
    AIP Publishing ; 2009
    In:  Journal of Applied Physics Vol. 105, No. 7 ( 2009-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 105, No. 7 ( 2009-04-01)
    Abstract: The magnetic transition has been studied in Mn1.1Fe0.9P0.8Ge0.2 by magnetic measurements and F57e Mössbauer spectroscopy. The alloy crystallizes in the hexagonal Fe2P-type structure with lattice constants of a=6.0476(4) Å and c=3.4766(7) Å. Both bulk magnetization measurements and Mössbauer spectroscopy show that the as-prepared sample has a significantly lower transition temperature on first cooling (TC1≈200 K) than after it has undergone thermal cycling to 20 K (TC20 K=240 K). The behavior of the material stabilizes after the first cooling/heating cycle and no further changes are observed in TC. Working with a stabilized sample, we find that the temperature dependence of the hyperfine field, Bhf(T), is more rapid than that predicted by a simple mean field Brillouin function, and in addition, Bhf(T) shows a thermal hysteresis of 10 K upon cooling versus heating. These results show that the magnetic transition at TC is definitely first order and suggest that there is an additional irreversible magnetostructural change during the first cooling process of the as-prepared sample.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3067496
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 8
    Online Resource
    Online Resource
    Microstructure and magnetic properties of isotropic bulk NdxFe94−xB6 (x=6,8,10) nanocomposite magnets prepared by spark plasma sintering
    AIP Publishing ; 2006
    In:  Journal of Applied Physics Vol. 99, No. 8 ( 2006-04-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 99, No. 8 ( 2006-04-15)
    Abstract: Nd 2 Fe 14 B ∕ α - Fe isotropic bulk nanocomposite magnets were prepared by spark plasma sintering (SPS) technique using melt-spun powders with a nominated composition of NdxFe94−xB6, with x=6, 8, and 10. It was found that higher sintering temperature improved the densification of the magnets, while it deteriorated their magnetic properties simultaneously due to the excess crystal grain growth. An increased compressive pressure led to better magnetic properties and higher density for the SPS magnets. An increase in the Nd amount resulted in a gradual increase in intrinsic coercivity and an obvious reduction of the remanence of the magnets simultaneously. A magnet with the composition of Nd8Fe86B6 possessed a Br of 0.99T, a Hci of 386kA∕m, and a (BH)max of 101kJ∕m3 under the optimal sintering condition. In addition, microstructure observation using transmission electron microscopy showed that compared with the starting powders the full-density magnets nearly maintain the morphology, indicating that there was no sign of pronounced crystal grain growth during the densification process.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2159391
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 9
    Online Resource
    Online Resource
    Structure evolution and entropy change of temperature and magnetic field induced magneto-structural transition in Mn1.1Fe0.9P0.76Ge0.24
    AIP Publishing ; 2013
    In:  Journal of Applied Physics Vol. 113, No. 4 ( 2013-01-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 113, No. 4 ( 2013-01-28)
    Abstract: The compound Mn1.1Fe0.9P0.76Ge0.24 has been studied using neutron powder diffraction (NPD), differential scanning calorimeter (DSC), and magnetic measurements, in order to clarify the nature of the magnetic and structural transition and measure the associated entropy change (ΔS). The strongly first order transition occurs from a paramagnetic (PM) to a ferromagnetic (FM) phase and can be induced either by temperature or by an applied magnetic field. Our investigations indicate that the two processes exhibit identical evolutions regarding the crystal and magnetic structures, indicating they should have the same entropy change. We, therefore, conclude that the ΔSDSC obtained by the DSC method (where the transition is temperature induced) is valid also for the magnetically induced transition, thus avoiding uncertainties connected with the magnetic measurements. We have obtained the ΔSDSC = 33.8 J/kg · K for this sample upon cooling, which would increase to 42.7 J/kg · K for a impurity-free and completely homogeneous sample. For comparison, the magnetic entropy changes (ΔSM) induced by magnetic field and calculated using the Maxwell relation yields a ΔSM = 46.5J/kg · K, 38% higher than ΔSDSC. These entropy results are compared and discussed.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4788803
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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