1,507 research outputs found
Structural Evolution Of Nanocrystalline Fe73.5cu1nb3si13.5b9
No full textIn this work we report structural information obtained by a detailed X-ray diffraction (XRD) study of the crystallization kinetics of the nanocrystalline material obtained from the amorphous compound Fe73.5Cu1Nb3Si13.5B9. Instrumental effects were eliminated from the experimental XRD profiles using the Stokes deconvolution method. Subsequent fitting with Cauchy-Gauss functions led to a quantitative estimate of the constituent phases. Lattice constants and partial volume fractions were calculated from the fitting parameters. Average crystallite sizes and lattice strains were calculated from the crystalline intensity through the Warren-Averbach Fourier method. This structural analysis complements a recently published study of the compositional evolution and magnetic properties of the same ribbon using Mössbauer spectroscopy (MS) (1), and focuses attention on the discrepancies in the values of volume fractions of the structural components calculated from XRD and MS experimental data. © 1993.24399405Knobel, Turtelli, Rechenberg, (1992) J. Appl. Phys., 71 (12), p. 6008Gleiter, Nanocrystalline materials (1989) Progress in Materials Science, 33 (4)Yoshizawa, Oguma, Yamauchi, (1988) J. Appl. Phys., 64 (10), p. 6044Köster, Schünemann, Blank-Bewersdorff, Brauer, Sutton, Stephenson, Nanocrystalline materials by crystallization of metal-metalloid glasses (1991) Materials Science and Engineering: A, 133 A, p. 611Noh, Pi, Kim, Kang, (1991) J. Appl. Phys., 69 (8), p. 5921Müller, Mattem, Illgen, (1991) Z. Mettalkde, 82 Bd. (12 H.), p. 895Hampel, Pundt, Hesse, (1992) J. Phys.: Condens. Matter, 4, p. 3195Jiang, Aubertin, Gonser, Hilzinger, (1991) Z. Metallkde, 82 Bd. (9 H.), p. 698Allia, Beatrice, Vinai, Knobel, Turtelli, (1991) Appl. Phys. Lett., 59 (19), p. 2454Young, Wiles, Profile shape functions in Rietveld refinements (1982) Journal of Applied Crystallography, 15, p. 430Herzer, (1989) IEEE Trans. Magn., 25, p. 3327. , (1989)Pundt, Hampel, Hesse, (1992) Z. Phys. B - Condens. Matter, 87, p. 65Ch. Polak, M. Knobel, R. Grossinger and R.S. Turtelli, J. Magn. Magn. Mater. (in press)Mikkola, Cohen, (1966) Local Atomic Arrangements studied by X-ray Diffraction, p. 290. , J.B. Cohen, J.E. Hilliard, Gordon and Breach Publ, New Yor
Initial Magnetic Permeability During The Development Of The Nanocrystalline State In Amorphous Ribbons
No full textLow-field initial permeability (μi) has been measured at several steps of nanocrystallization in four amorphous Fe73.5Cu1Nb3Si13.5B9 ribbons produced by planar flow casting with different quenching rates (QRs) from the melt. It is observed that the increase in μi upon nanocrystallization is strongly influenced by the initial free-volume content of each sample. Samples produced with higher quenching rates exhibit a faster transformation kinetics and stronger enhancement of the initial permeability in the nanocrystalline state. Conventional heat treatments and accumulative annealings were performed on all the ribbons, in order to study the effect of their inhomogeneities and induced anisotropies. © 1994.1331-3255258Yoshizawa, Oguma, Yamauchi, (1988) J. Appl. Phys., 64, p. 6044Knobel, Turtelli, Rechenberg, (1992) J. Appl. Phys., 71, p. 6008Köster, Herold, Glassy Metals I: Ionic Structure (1981) Electronic Transport and Crystallization, p. 254. , H.J. Güntherodt, H. Becker, Springer-Verlag, BerlinKnobel, Sinnecker, Saenger, Turtelli, Effect of as-cast topological disorder on the magnetic properties of nanocrystalline Fe73.5Cu1Nb3Si13.5.B9 (1993) Philosophical Magazine Part B, 68, p. 861C. Polak, M. Knobel, R. Grössinger and R. Sato Turtelli, J. Magn. Magn. Mater. (to appear)P. Allia, M. Baricco, M. Knobel, P. Tiberto and F. Vinai, IEEE Trans. Magn. (in press)Knobel, Sinnecker, Turtelli, Rechenberg, Grössinger, (1993) J. Appl. Phys., 73, p. 6603Knobel, Santos, Torriani, Turtelli, (1993) Nanostr. Mater., 2, p. 399Luborsky, (1983) Amorphous Metallic Alloys, p. 360. , F.E. Luborsky, Butterworths, Londo
Quenched-in Stresses In Amorphous Ribbons
No full textA set of four samples of the composition Fe73.5Cu1Nb3Si13.5B9 produced with different quenching rates was investigated in the amorphous state. In addition to disaccommodation experiments, the stress dependences of the coercivity and of the pinning field were also determined. The stress dependence of the coercivity was fitted using a pinning model. These data show the effects of anisotropy fluctuations as well as of the surface roughness. © 1994.1331-32023Yoshizawa, Oguma, Yamauchi, (1988) J. Appl. Phys., 64, p. 6044Herzer, Grain structure and magnetism of nanocrystalline ferromagnets (1989) IEEE Transactions on Magnetics, p. 3327Schäfer, Hubert, Herzer, Domain observation on nanocrystalline material (1991) Journal of Applied Physics, 69, p. 5325Ch. Polak, M. Knobel, R. Grössinger and R. Sato Turtelli, J. Magn. Magn. Mater., to be publishedAllia, Luborsky, Soardo, Sato Turtelli, Vinai, Magnetic relaxation in amorphous ribbons prepared with different quenching rates (1981) IEEE Transactions on Magnetics, p. 2615Polak, Grössinger, Holubar, Knobel, Sato Turtelli, Sassik, (1993) Key Engineering Materials, 81-83, p. 239. , P. Duhaj, P. Mrafko, P. SvecPolak, Grössinger, Sinnecker, Knobel, Turtelli, Kuβ, (1993) Proc. MEA, , CapriTakayama, Oi, (1979) J. Appl. Phys., 50, p. 4962J.P. Sinnecker, R. Sato Turtelli, M. Knobel and J.F. Saenger, Proc. EMMA '93, KosicePolak, (1992) Thesis, , University of ViennaKnobel, Sinnecker, Turtelli, Rechenberg, Grössinger, (1993) J. Appl. Phys., 73, p. 6603Allia, Viani, (1982) Phys. Rev. B, 26, p. 6141Luborsky, (1983) Amorphous Metallic Alloys, p. 311. , Butterworths, Londo
Evolution Of The Microstructure And Magnetic Properties Of Sm(co 0.6cu0.4)5 Alloys Prepared With Different Sm Excess Content
No full textThe structure of annealed Sm(Co0.6Cu0.4)5 compounds, prepared with different Sm excess content, has been investigated by means of high resolution x-ray diffraction and scanning electron microscopy. The samples were also magnetically characterized by thermomagnetic analysis and M versus H curves at room temperature. Increasing Sm excess improves the compositional order of the 1 : 5 phase. The coercivity (HC) and the Curie temperature (TC) are both changed as a function of Sm excess content. The decrease in the structural defects density, resulting from the compositional order, is responsible for the observed magnetic behaviour. © 2009 IOP Publishing Ltd.4212Gabay, A.M., Larson, P., Mazin, I.I., Hadjipanayis, G.C., (2005) J. Phys. D: Appl. Phys., 38 (9), pp. 1337-1341Pentón, A., Estévez, E., Lora, R., Espina-Hernndez, J.H., Grössinger, R., Turtelli, R.S., Valor-Reed, A., (2007) J. Alloys Compounds, 429 (1-2), pp. 343-347Liu, X., Zhao, H., Kubota, Y., Wang, J.P., (2008) J. Phys. D: Appl. Phys., 41 (23), p. 232002Hofer, F., (1970) IEEE Trans. Magn., 6 (2), p. 221Fähnle, M., Oesterreicher, H., (1983) J. Magn. Magn. Mater., 38 (3), pp. 331-335Téllez-Blanco, J.C., Grössinger, R., Turtelli, R.S., (1999) J. Alloys Compounds, 283 (1-2), pp. 289-295Téllez-Blanco, J.C., Grössinger, R., Turtelli, R.S., (1997) Proc. Workshop on High Coercivity MaterialsLectard, E., Allibert, C.H., Ballou, R., (1994) J. Appl. Phys., 75 (10), pp. 6277-6279Forner, S., McNiff, E.J., Oesterreicher, H., Parker, F.J., Misroch, M., (1978) J. Appl. Phys., 49 (3), pp. 2061-2063Barbera, B., Uehara, M., (1976) IEEE Trans. Magn., 12 (6), pp. 997-999Estévez-Rams, E., Fidler, J., Pentón, A., Téllez-Blanco, J.C., Turtelli, R.S., Grössinger, R., (1999) J. Alloys Compounds, 283 (1-2), pp. 327-330Estévez-Rams, A., Pentón, A., Novo, S., Fidler, J., Téllez-Blanco, J.C., Grössinger, R., (1999) J. Alloys Compounds, 283 (1-2), pp. 289-295Estévez-Rams, E., Fidler, J., Pentón, A., ValorRed, A., Téllez-Blanco, J.C., Turtelli, R.S., Grössinger, R., (1999) J. Magn. Magn. Mater., 195 (3), pp. 595-600Tang, W., Zhang, Y., Hadjipanayis, G.C., (2000) Appl. Phys. Lett., 77 (3), p. 421Tang, W., Zhang, Y., Hadjipanayis, G.C., (2003) J. Appl. Phys., 91 (10), p. 7896Schobinger, D., Gutfleisch, O., Hinz, D., Mueller, K.H., Schultz, L., Martinek, G., (2002) J. Magn. Magn. Mater., 242-245, p. 1347Kubish, M., Brown, N.D., Gutfleisch, O., Gebel, B., Mueller, K.H., Schultz, L., Harris, I.R., (2000) IEEE Trans. Magn., 36 (5), p. 3303Verma, A., Sidhu, R.K., Mahajan, S., Paney, O.P., (1996) J. Mater. Sci. Lett., 15 (23), p. 2088Teresiak, A., Kubis, M., Mattern, N., Wolf, M., Gruner, W., Mueller, K.H., (1999) J. Alloys Compounds, 292 (1-2), p. 212De Campos, M.F., Rios, P.R., (2004) J. Alloys Compounds, 377 (1-2), p. 121Grössinger, R., Wittig, E., Küpferling, M., Taraba, M., Reyne, G., Golovanov, C., Enzberg-Mahlke, B., Dudding, J., (1999) IEEE Trans. Magn., 35 (5), p. 3971Fidler, J., (1997) 11th Int. Conf. on Ternary and Multinary Compounds, ICTMC-11Lebail, A., Duroy, H., Fourquet, J.L., (1988) Mater. Res. Bull., 23 (3), p. 447Zhang, Y., Gabay, A., Wang, Y., Hadjipanayis, G.C., (2004) J. Magn. Magn. Mater., 272-276, pp. 1899-e1900De Campos, M.F., Okamura, H., Hadjipanayis, G.C., Rofrigues, D., Landgraf, F.J.G., Neiva, A.C., Romero, S.A., Missell, F.P., (2004) J. Alloys Compounds, 368 (1-2), pp. 304-307Gjoka, M., Kalogirou, O., Sarafidis, S., Niarchos, D., Hadjipanayis, G.C., (2002) J. Magn. Magn. Mater., 242-245, pp. 844-846Allen, C.W., Liao, K.C., Miller, E., (1977) J. Less-Common Met., 52 (1), p. 10
The Development Of Nanocrystalline Fe73.5cu1nb3si13.5b9: Magnetism And Structural Disorder
No full textIn order to study the effect of the initial degree of topological disorder on the formation of the nanocrystalline state, two amorphous ribbons of composition Fe73.5Cu1Nb3Si13.5B9 produced in different laboratories were investigated. Measurements of hysteresis loops, disaccommodation and magnetostriction were performed on as-cast and nanocrystalline samples. An analytically solvable model describing the stress dependence of the coecivity is discussed. Two types of analysis of the approach to saturation are used to estimate the distribution function of the magnetization vectors. From the pinning field, the dimension of long-range order stresses in the nanocrystalline state is deduced. © 1994.1341112Yoshizawa, Oguma, Yamauchi, (1988) J. Appl. Phys., 64, p. 6044Herzer, (1992) J. Magn. Magn. Mater., 112, p. 258Gleiter, Nanocrystalline materials (1989) Progress in Materials Science, 33 (4)Herzer, (1989) IEEE Trans. Magn., 25, p. 3327Knobel, Sato Turtelli, Rechenberg, (1992) J. Appl. Phys., 71, p. 6008Schäfer, Hubert, Herzer, Domain observation on nanocrystalline material (1991) Journal of Applied Physics, 69, p. 5325Grössinger, Wazulek, Sassik, The influence of the magnetostriction on the coercivity of amorphous ribbons (1990) Journal of Magnetism and Magnetic Materials, 83, p. 351Kersten, (1943) Z. Phys., 44, p. 63Allia, Luborsky, Soardo, Sato Turtelli, Vinai, Magnetic relaxation in amorphous ribbons prepared with different quenching rates (1981) IEEE Transactions on Magnetics, 17, p. 2615Sato Turtelli, Vinai, (1990) Rev. Bras. Fis., 20, p. 203Narita, Yamasaki, Fukunaga, (1980) IEEE Trans. Magn., 16, p. 435Allia, Vinai, (1982) Phys. Rev. B, 26, p. 6141Allia, Vinai, (1986) Phys. Rev. B, 33, p. 422Allia, Vinai, (1981) IEEE Trans. Magn., 17, p. 1481Kronmüller, Theory of magnetic after-effects in ferromagnetic amorphous alloys (1983) Philosophical Magazine Part B, 48, p. 127Kronmüller, Moser, Rettenmeier, Micromagnetic analysis of magnetic after-effects in amorphous alloys by two-level systems (1984) IEEE Transactions on Magnetics, 20, p. 1388Kronmüller, (1981) Atomic Energy Rev. Suppl., 1, p. 255Vazquez, Fernengel, Kronmüller, (1989) Phys. Stat. Solidi (a), 115, p. 547J. Gonzales, M. Vazquez, E. T. de Lacheisserie and G. Herzer, unpublishedPolak, Grössinger, Holubar, Knobel, Sato Turtelli, Sassik, Determination of the Quenched-In State of Amorphous Ribbons Applying the Law of Approach to Saturation (1993) Key Engineering Materials, 81-83, p. 239Stoner, Wohlfarth, A Mechanism of Magnetic Hysteresis in Heterogeneous Alloys (1948) Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 240 A, p. 599Zhao-Hua, Dao-Sheng, (1981) J. Appl. Phys., 52, p. 1923Allia, Beatrice, Vinai, Knobel, Sato Turtelli, (1991) Appl. Phys. Lett., 59, p. 245
Coercivity And Disaccommodation On Amorphous (fe1-xrx)80b20
No full textAmorphous ribbons of the composition (Fe1-xRx)80B20 (R = Y, Ce, Pr, Nd, Sm, Gd, Ho, Er, Tm, Lu) (0{precedes above single-line equals sign}x{precedes above single-line equals sign}0.08) were studied by means of disaccommodation measurements, pinning field and coercivity measurements. The after-effect scales roughly with the square of the magnetostriction constant. The concentration dependence of the pinning field can be correlated with that of the coercivity. © 1994.1331-3270272Idzikowski, Wrzeciono, (1988) Phys. Stat. Solidi (a), 108, p. 375Khan, (1990) J. Magn. Magn. Mater., 86, p. L143Tejada, Martinez, Labarta, Grössinger, Hernando, (1990) J. Appl. Phys., 67, p. 5984Polak, (1992) Thesis, , University of ViennaJ.P. Sinnecker, M. Knobel, J.F. Saenger and R. Sato Turtelli, Proc. EMMA'93 (Kosice)Narita, Yamasaki, Fukunaga, (1980) IEEE Trans. Magn., 16, p. 435Grössinger, Wezulek, Sassik, The influence of the magnetostriction on the coercivity of amorphous ribbons (1990) Journal of Magnetism and Magnetic Materials, 83, p. 351Sinnecker, Grössinger, Turtelli, Exel, Greifeneder, Kuβ, (1994) J. Magn. Magn. Mater., 133, p. 20. , (this volume)Rezende, Turtelli, Missel, (1987) IEEE Trans. Magn., 23, p. 212
Shear Transformations and the Relaxation of the Magnetic-permeability Aftereffect In Amorphous Ferromagnets
No full textLow-temperature Behavior of the Magnetic-permeability Aftereffect In Amorphous Ferromagnetic-alloys
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On The Nature Of The Disordered Microstructure In Sm(co,cu)5 Alloys With Increasing Cu Content
No full textX-ray diffraction and transmission electron microscopy (TEM) experiments were performed in heat-treated Sm(Co,Cu)5 samples with different Co/Cu content. The major phase observed in the diffraction patterns exhibits a hexagonal CaCu5 type structure in all the studied compositions. The behavior of the diffraction profiles, as function of the Cu content, is believed to be due to an inhomogeneous distribution of Co and Cu through out the samples. Heavily planar faulted regions have been observed by means of TEM and are also associated with Sm and Co rich phases within the matrix. A CaCu5 type structure with local Sm rich regions seems to be responsible for the observed magnetic behavior. © 2006 Elsevier B.V. All rights reserved.42901/02/15343347Jaccarino, V., Walker, L.R., (1965) Phys. Rev. Lett., 15, p. 258Lectard, E., Allibert, C.H., Ballou, R., (1994) J. Appl. Phys., 75 (10)Kahn, Y., (1974) Phys. Stat. Sol. (a), 23, pp. K151Nesbitt, E.A., Wernick, J.H., Corenzwit, E., (1959) J. Appl. Phys., 30, p. 365Katayama, T., Shibata, T., (1973) J. Appl. Phys., 12, p. 319Kamino, K., Kimura, Y., Suzuki, T., Itayama, Y., (1973) Trans. Jpn. Inst. Met., 14, p. 135Buschow, K.H.J., Brouha, M., (1976) J. Appl. Phys., 47, p. 1653Mitchell, R.K., McCurrie, R.A., (1986) J. Appl. Phys., 12, p. 4113Barbara, B., Uehara, M., (1976) IEEE Trans. Magn. MAG-12, p. 997Estévez-Rams, E., Fidler, J., Pentón, A., Téllez-Blanco, J.C., Turtelli, R.S., Groessinger, R., (1999) J. Alloys Compd., 283, pp. 327-330Estévez-Rams, E., Pentón, A., Novo, S., Fidler, J., Téllez-Blanco, J.C., Groessinger, R., (1999) J. Alloys Compd., 283, pp. 289-295Estévez-Rams, E., Fidler, J., Pentón, A., Valor-Red, A., Téllez-Blanco, J.C., Turtelli, R.S., Groessinger, R., (1999) J. Magn. Magn. Mater., 195, pp. 595-600Zhang, Y., Gabay, A., Wang, Y., Hadjipanayis, G.C., (2004) J. Magn. Magn. Mater., 272-276, pp. e1899-e1900de Campos, M.F., Okamura, H., Hadjipanayis, G.C., Rofrigues, D., Landgraf, F.J.G., Neiva, A.C., Romero, S.A., Missell, F.P., (2004) J. Alloys Compd., 368, pp. 304-307Gjoka, M., Kalogirou, O., Sarafidis, C., Niarchos, D., Hadjipanayis, G.C., (2002) J. Magn. Magn. Mater., 242-245, pp. 844-846Yu, H.-C., Li, J.-Q., Bei, Y.-Q., Zhou, Y.-Q., Zhang, J., Zhang, W.-Y., Shen, B.-G., (2004) J. Electron. Microsc., 53 (1), pp. 37-42Allen, C.W., Liao, K.C., Miller, E., (1977) J. Less-Comm. Met., 52, p. 10
Free-volume Dependence of the Electrical-resistivity of Metallic Glasses Prepared With Different Quenching Rates
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