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Öğe (3, 3-Dichloro-1, 4-Diphenyl-2-Azetidinone)(Int Union Crystallography, 1999) Guven, K.; Durlu, T. N.; Kabak, M.; Guner, V.…Öğe (3,3-Dichloro-4-(P-Methoxyphenyl)-1-(P-Chlorophenyl)-2-Azetidinone)(Int Union Crystallography, 1999) Durlu, T. N.; Guven, K.; Kabak, M.; Guner, V.…Öğe The effect of austenitizing time on martensite morphologies and magnetic properties of martensite in Fe-24.5%Ni-4.5%Si alloy(Springer, 2007) Güngüneş, H.; Yaşar, E.; Durlu, T. N.The effect of austenitizing time on the formation of martensite in Fe-24.5%Ni-4.5%Si alloy has been studied by means of transmission electronmicroscope (TEM), scanning electronmicroscope (SEM) and Mossbauer spectroscopy technique. TEM and SEM observations revealed that the martensite morphology was found to be closely dependent on the austenitizing time. The orientation relationship between austenite and thermally induced martensite was found as the Kurdjumov-Sachs type. The volume fraction changes of martensite and austenite phases, the hyperfine magnetic field of martensite phase and isomery shift values have been determined by Mossbauer spectroscopy. The Mossbauer study also revealed that the martensite volume fractions increased with increasing austenite grain size.Öğe Effect of Mo on the magnetic properties of martensitic phase in Fe-Ni-Mo alloys(Elsevier Science Sa, 2006) Yaşar, E.; Güngüneş, H.; Kılıç, A.; Durlu, T. N.The paramagnetic-magnetically ordered transition and the effect of Mo content on the magnetic properties of martensite phase in Fe-30% Ni-x% Mo alloys have been investigated by AC susceptibility and Mossbauer spectroscopy. The results show that martensitic transformation temperature (M(S)) indicates the magnetic transition from paramagnetic to magnetically ordered state. Hyperfine magnetic field, isomery shift and volume fractions of phases were determined by Mossbauer spectroscopy. It is also found that volume fraction of thermally induced martensite and M(S) temperature decreased with the increasing Mo content. (c) 2006 Elsevier B.V. All rights reserved.Öğe Formation and magnetic properties of butterfly-shaped martensite in an Fe-Ni-Cr alloy(Elsevier Science Sa, 2006) Aktürk, Selçuk; Durlu, T. N.The butterfly-shaped martensitic transformation has been examined by means of transmission electron microscope (TEM) and the magnetic properties of the alloy have been studied by using Mossbauer spectroscopy in an Fe-16.24%Ni-0.46%Cr (at.%) alloy. Mossbauer spectroscopy examinations showed that the austenite state is paramagnetic and butterfly martensite is ferromagnetic. The volume fraction changes, the effective hyperfine field of the ferromagnetic martensite phase and isomery shift values have also been determined by Mossbauer spectroscopy. In situ TEM studies were carried out in order to elucidate the nucleation and growth mechanisms of the martensite. The nucleation and growth of martensite is related to the motion of dislocations in austenite and this fact plays an important role in the kinetics of the martensitic transformation. Based on these experimental results, the nucleation and growth mechanisms of martensite crystals are discussed in detail. (c) 2006 Published by Elsevier B.V.Öğe The investigation of nonlinear optical properties of N-(3-fluorophenyl)naphthaldimine(Elsevier, 2005) Ünver, H.; Karakaş, A.; Elmalı, A.; Durlu, T. N.A new ligand N-(3-fluorophenyl)naphthaldimine (C17H12NOF) has been synthesized. The physical properties and structure of this ligand have been characterized by X-ray diffraction analysis, elemental analysis, FT-IR, H-1-NMR and UV-visible spectroscopies. It is found that the title compound has solvatochromic behavior in the UV and visible regions, implying non-zero microscopic first hyperpolarizability. The electric dipole moment (mu) and the first hyperpolarizability (beta) values of the investigated molecule have been computed using ab initio quantum mechanical calculations (finite field second-order Moller Plesset perturbation theory). The calculation results also reveal that the synthesized molecule might have microscopic nonlinear optical (NLO) behavior with non-zero values. (C) 2004 Elsevier B.V. All rights reserved.Öğe Martensitic transformation and magnetic properties of Fe-24.5%Ni-4.5%Si alloy(Maney Publishing, 2007) Güngüneş, H.; Yaşar, E.; Kilic, A.; Durlu, T. N.The effect of austenitising temperature and cooling rate on the morphology and magnetic properties of martensite in Fe-24-5%Ni-4-5%Si alloy has been studied by means of scanning electron microscopy, Mbssbauer spectroscopy and AC susceptibility. Martensite morphology was found to be closely dependent on the austenitising temperature and cooling rate. The changes in volume fraction of martensite and austenite phases, the internal magnetic field of martensite phase and the isomery shift values have been determined by Mbssbauer spectroscopy. The Mbssbauer study revealed that the martensite volume fractions increased with increasing austenitising temperature and cooling rate. Also internal magnetic field of martensite was decreased by increasing the martensite volume fractions. AC magnetic susceptibility measurements showed that the Neel temperatures T-N and the magnetic susceptibility X increase with increasing austenitising temperatures.Öğe Some characteristics of thermally induced martensite in Fe-30%Ni-3.6%Mo alloy(Elsevier Science Inc, 2008) Yasar, E.; Guler, E.; Gungunes, H.; Durlu, T. N.Kinetical, morphological and magnetic characteristics of thermally induced martensite in an Fe-30%Ni-3.6%Mo alloy has been studied by scanning electron microscopy, transmission electron microscopy and Mossbauer spectroscopy. Scanning electron microscope and transmission electron microscope observations revealed the occurrence of both athermal and isothermal martensitic transformation in the alloy. In addition, the magnetic properties of both the austenite and martensite phases were determined by the Mossbauer spectroscopy. The Mossbauer spectra showed a paramagnetic character for the austenite phase and an antiferromagnetic character for the martensite phase. (C) 2007 Elsevier Inc. All rights reserved.
