Yazar "Adiguzel, HI" seçeneğine göre listele

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    Conduction in Y1-xScxBa2Cu3Oy
    (Slovak Acad Sciences Inst Physics, 2005) Ulug, A; Ulug, B; Adiguzel, HI
    A variational problem for three-dimensional (3D) classical lattice models is considered with trial state given by two-dimensional (2D) uniform product of local variational weights. This approach, the tensor product variational approach (TPVA), has been applied to 3D classical models (the Ising and the Potts models). We consider a way of estimating the magnetic critical exponent $\beta$ for the simple 3D Ising model assuming a functional form of the spontaneous magnetization in the off critical region, where the TPVA provides reliable data.
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    Effect of different heat treatments on magnetoelastic properties of Fe-based amorphous wire
    (Elsevier Science Sa, 2001) Atalay, S; Adiguzel, HI; Kamer, O
    The field dependence of Young's modulus of Fe77.5Si7.5B15 amorphous ferromagnetic wires were studied in as-quenched state and after furnace, current and pulse annealing. In as-quenched state, the change in Young's modulus as a function of field is small due to induced large anisotropy during the quenching process. Annealing for short times is sufficient to remove most of the quenched stresses resulting in magnetic softening and large change in Young's modulus. Further furnace or current annealing leads to surface crystallization which develops an easy axis in the circumferential direction, but such an easy axis was not observed in pulse annealed samples. The temperature of current annealed samples were calculated from resistance-temperature curve and the temperature of pulse annealed samples were estimated from T-t curve, where T is the annealing temperature and t the annealing time to reach the minimum value of coercivity. (C) 2001 Elsevier Science B.V. All rights reserved.
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    Infrared absorption study of Fe2O3-CaO-SiO2 glass ceramics
    (Elsevier Science Sa, 2001) Atalay, S; Adiguzel, HI; Atalay, F
    The ceramic lasses were prepared from extra pure reagents of Fe2O3, CaO and SiO2 powders. The 15 g batch was melted at 1550 degreesC, for 2 h in a platinum crucible. The glass structure was obtained by pouring the melt into a copper plate and pressing quickly by another copper plate. The glass structure was checked by XRD. IR studies were first made in ceramic glasses for various Fe contents. The 19.5Fe(2)O(3). 40.25CaO . 40.25SiO(2) glass sample was annealed at 750 degreesC under hydrogen atmosphere, hi the annealed sample new vibration bands were observed which were absent in the untreated samples, It was observed that the new peaks are mainly due re, the formation of beta -CaSiO3 (wollastonite) phases. (C) 2001 Elsevier Science B.V. All rights reserved.
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    Magnetocaloric effect in the La0.62Bi0.05Ca0.33MnO3 compound
    (Elsevier, 2005) Gencer, H; Atalay, S; Adiguzel, HI; Kolat, VS
    Bi-doped lanthanum manganite with chemical composition of La0.62Bi0.05Ca0.33MnO3 has been prepared by the standard solid-state process. The effect of Bi doping on the sintering temperature, the magnetic and magnetocaloric properties has been investigated. Bi2O3 was found to be an effective sintering aid for La0.67Ca0.33MnO3. It was found that small amounts of Bi doping (x = 0.05) can lower the sintering temperature about 200 degrees C. Bi-doped samples also exhibited a large magnetic entropy change, vertical bar Delta S-m vertical bar 3.5 J/kg K under 1 T field at the Curie temperature. (c) 2004 Elsevier B.V. All rights reserved.
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    Study of nanocrystalline Fe-M-Cu-Nb-Si-B (M = Cr, Co, Ni) ribbons by elastic modulus measurements
    (Elsevier Science Sa, 2001) Atalay, S; Adiguzel, HI; Squire, PT; Sovak, P
    The magnetic and magnetoelastic properties of Fe72M1.5Cu1Nb3Si13.5B9 (M = Co, Cr, Ni) samples have been investigated. The samples were annealed between 400 and 650 degreesC under argon atmosphere to induce varying nanocrystalline fractions. It was observed that the magnitude of field dependence of Young's modulus varies from 50% to nearly zero as the saturation magnetostriction is reduced by alpha -FeSi grains. The results are discussed in terms of stress relief and reduced magnetostriction constant. (C) 2001 Elsevier Science B.V. All rights reserved.