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  • 1
    Electronic Resource
    Electronic Resource
    Preparation of Composite Ceramics of NiFe〈sub〉2〈/sub〉O〈sub〉4〈/sub〉/PZT by Sol-Gel Method and their Magnetoelectric Effect (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 238-241 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The precursor powder of lead-zirconate-titanate (PZT) and NiFe2O4 (NFO) was preparedusing one step sol-gel method. The dry powders got after a series of processes were sintered via aconventional ceramic solid-state reaction technique. All the diffraction peaks in the XRD patterns ofthe composites can be readily indexed to NFO and PZT, respectively. The SEM micrograph showstwo different phases of PZT and NFO distinctly and the particle size of NFO was about 2~4 μm. Themagnetoelectric (ME) coefficient, dielectric constant, piezoelectric constant, magnetic hysteresisloops of the samples were measured. The dc magnetic Hdc resulting in the maximum ME coefficientvaries from 0.65kOe to 1.0kOe with the increase of the NFO volume fraction. The maximummagnetoelectric coefficient of 6.15Vcm-1Oe-1 was obtained at resonance frequency of 289.8kHz, dcmagnetic intensity of 0.8kOe and NFO volume fraction of 0.25
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.238.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Positron Annihilation and Chemistry of Groups in Hyperbranched Polymers (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 607 (Nov. 2008), p. 85-87 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, both lifetime and intensity in hyperbranched polymers were measured by using positron annihilation lifetime spectroscopy (PALS) measurements. Ortho-positronium properties upon the degree of branching (DB) have been studied; o-Ps lifetimes maintain a constant while an increase in o-Ps intensities has been detected with DB increasing. Which is inconsistent with author’s prediction and indicate that interactions between positronium and the free-volumes are strongly depend on not only the free-volume size properties but also its chemistry environment, due to the variations in the distribution of the different ending groups: –OH and -CH3, caused by DB changes in hyperbranched polymers. The present works demonstrate that in the polar-polymeric application of PALS, effects of the distribution of polar groups should be properly taken into consideration
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.607.85.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary crystallographic studies of antibacterial polypeptide LCI expressed in Escherichia coli (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 1931-1932 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: LCI is a type of novel antibacterial polypeptide secreted by a Bacillus subtilis strain. It consists of 47 residues with a molecular weight of 5468 Da. Using bioengineering, LCI was expressed in Escherichia coli DH5α with recombinant plasmid pBVAB16. It was crystallized using PEG 4000 as a precipitant. The crystal belongs to space group P6222 or P6422, with unit-cell parameters a = b = 29.30, c = 187.09 Å, and diffracts to 2.44 Å. A set of diffraction data to 2.8 Å was collected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444901017280
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  • 4
    Electronic Resource
    Electronic Resource
    Mechanically alloyed 1:12 nitrides and carbides : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6245-6247 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nd10Fe90−yMoyNx(y=8,12,15) nitrides and Nd10Fe75Mo15Cx carbides have been prepared by mechanical alloying. The experimental results show that both Tc and Ms increase from 310 to 355 °C and from 84.5 to 108.8 emu/g, respectively, when the Mo content is reduced from 15 to 8 at. %. However, the coercivity of the lower Mo content Nd10Fe90−yMoyNx compounds is decreased with a value of Hc=4.0–4.5 kOe for y=8. An increase in coercivity by 2–3 kOe was obtained after an addition of 1.5 at. % Dy in the Nd8.5Dy1.5Fe82Mo8Nx compound. Al-bonded magnets were made with mechanically alloyed powders using Al contents from 5 to 40 wt % and bonding temperatures in the range of 600–680 °C. The coercivity of the bonded magnets was found to increase by about 1–2 kOe. The best results are obtained on a 10 wt % Al sample, bonded at 660 °C with Hc=9.5 kOe. Both the nitrides and carbides had very high coercivities (Hc(approximately-greater-than)22 kOe) at low temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352712
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanically alloyed nanocomposite magnets : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6649-6651 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic and structural properties of mechanically alloyed Nd2Fe14B+ (Fe, FeCo) powders have been investigated over a wide range of temperatures. X-ray diffraction patterns on samples milled for 48 h showed that the powders had a two-phase structure consisting of a disordered Nd-Fe-B alloy and α-Fe with a fine grain size about 140 A(ring). Enhanced magnetic remanence in the range of 95–105 emu/g with reduced remanence α=Mr/Ms=0.60–0.68 and a coercivity Hc=4–6 kOe have been obtained after annealing at 650–750 °C. This behavior is the result of an exchange coupling between the hard and soft phases with small grain sizes, about 500 and 200 A(ring), respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356883
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic properties of Fe–Cr ultrafine particles : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5900-5902 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe100−xCrx ultrafine particles (UFP) with x=5–55 and a size in the range of 100–500 A(ring) have been prepared by the gas evaporation method using Ar gas pressures P=2, 5, and 8 Torr. Transmission electron microscopy with energy dispersive x-ray analysis showed that the composition and structure of the UFPs was the same as in the original bulk alloy. The coercivity Hc at room temperature for the Fe95Cr5, Fe90Cr10, and Fe80Cr20 UFPs reached values up to 1250, 780, and 625 Oe, respectively. The temperature coefficients of these UFPs α(Hc) = −0.09%/°C were much smaller than those of Fe in the temperature range of 20–450 °C when x≤20. A strong antiferromagnetic coupling between Fe and Cr appeared in the small particles. Both the coercivity and saturation magnetization were found to decrease with Cr addition. For samples with x=50%–60%, Hc = 200–300 Oe, and Ms = 30–60 emu/g.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350100
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  • 7
    Electronic Resource
    Electronic Resource
    Ultrafine particles of Fe, Co, and Ni ferromagnetic metals : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5119-5121 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe, Co, and Ni ultrafine particles (UFP) were prepared by a gas evaporation method in an inert atmosphere. The different preparing conditions of the Fe, Co, and Ni UFP included inert gas pressures and kinds were investigated by means of x-ray diffraction, transmission electron microscopy (TEM), and magnetic measurements with low or high temperatures. The experimental results show that coercivities Hc of the Fe, Co, and Ni UFP, depending on particle sizes, obey a single-domain theory. The maximum Hc was 450, 1000, and 1500 Oe, respectively, for Ni (310 A(ring)), Fe (210 A(ring)), and Co (200 A(ring)) at room temperature. The coercivities came up to high in the low temperatures. The saturation magnetizations Ms of the Fe, Co, and Ni UFP decreased with small particle sizes. A face-centered structure of Co UFP (200–300 A(ring)) was confirmed by x-ray diffraction. Some Fe UFP in the shape of balls (200–400 A(ring)) observed in the TEM may be an amorphous structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348144
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  • 8
    Electronic Resource
    Electronic Resource
    Temperature feature of NdDyFeB magnets with ultrahigh coercivity : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5512-5514 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The intrinsic coercivities Hc of Nd14DyxFe79−xB7 magnets, prepared by a powder metallurgical method, with an addition of Dy (x=2 at. %), reached 21 kOe. The intrinsic coercivity Hc was kept over 10 kOe when the heating temperature was 150 °C and the temperature coefficient α(Hc) = −0.35%/°C was in a temperature range of 16–150 °C. After aging at 120 °C for 400 h, the intrinsic coercivities Hc and magnetic energy products (BH)max of the magnets did not change as usual, remaining at Hc = 21 kOe and (BH)max = 30 MGOe. The NdFeB magnets with all kinds of the intrinsic coercivities were compared at various temperatures also. The experimental results show that high-temperature features of the NdFeB magnets were improved by increasing the intrinsic coercivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347984
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  • 9
    Electronic Resource
    Electronic Resource
    Comparison on the magnetic and structural properties of Sm(Co0.67−xFe0.25Cu0.06Zr0.02Cx)8.0, where x=0–0.15, melt spun ribbons and cast alloys (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4657-4659 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of C additions on the phase transformation and magnetic properties of Sm(Co0.67−xFe0.25Cu0.06Zr0.02Cx)8.0, where x ranged from 0 to 0.15, melt spun ribbons and cast alloys have been studied by x-ray diffraction (XRD), differential thermal analysis (DTA), and vibrating sample magnetometer. In addition to the Th2Zn17 structure, two additional compounds, namely, the ZrC and SmCoC2, were detected by XRD after a thermal treatment over 700–1160 °C. The as-spun ribbons were highly crystalline at x=0 and became mostly amorphous at x=0.10. An intrinsic coercivity, Hci, of 3.0 kOe was obtained for the as-spun ribbons with x=0.05. After an optimum heat treatment, the Hci of the ribbons with x=0.01 was increased to 8 kOe. Cast alloys of identical chemical compositions were also solution treated and precipitation hardened. At x=0 for the cast alloy, a Br of 10.8 kG, Hci of 24 kOe, Hc of 9.8 kOe, and (BH)max of 27 MGOe, were obtained after an optimum heat treatment. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370438
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  • 10
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of the Sm(Co0.68−xFe0.25Cu0.07Zrx)7.7 melt-spun alloys with Zr additions (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6713-6715 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of Zr additions on the Sm(Co,Fe,Cu,Zr)z compound have been studied. Melt-spun ribbons with a composition of Sm(Co0.68−xFe0.25Cu0.07Zrx)7.7 (x=0, 0.02, 0.04, 0.07, 0.10, and 0.15) were prepared with a wheel speed of 45 m/s, followed by a vacuum heat treatment in the temperature range of 650–800 °C for 5 min. X-ray diffraction (XRD) results showed that the as-spun ribbons of Sm(Co0.68−xFe0.25Cu0.07Zrx)7.7 have a primary TbCu7-type phase. When the annealing temperature was increased, grain sizes in the ribbons were increased according to reduced XRD peak widths of the TbCu7 phase. A Co23Zr6 compound was observed in the heat-treated ribbons when the Zr content exceeded 0.04. Saturation magnetization of the ribbons was linearly decreased from 95 to 45 emu/g (under a magnetic field H=18 kOe), while the Zr content was increased from 0 to 0.15. However, intrinsic coercivity of the ribbons was significantly dependent on grain size which was associated with both the Zr contents and heat-treatment temperatures. The highest intrinsic coercivity, Hci=13 kOe, was obtained in the ribbons with Zr content of 0.10 and heat treatment at 650 °C. With a maximum energy products up to 9.5 MGOe amd Br of 7.4 kG in the heat-treated ribbons with a suitable Zr addition is considered as promising magnets for high temperature applications. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372817
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