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    Crystal structure of N-[(1Z)-1-(3-methyl-3-phenyleyclobutyl)-2-thiomorpholin-4-ylethylidene] thiourea
    (Wiley-V C H Verlag Gmbh, 2005) Sari, Uğur; Yılmaz, İpek; Çukurovalı, A.; Güven, Kutalmış; Aksoy, İlhan
    The crystal structure of N-[(1Z)-1-(3-methyl-3-phenylcyclobutyl)-2-thiomorpholin-4-ylethylidene] thiourea (C18H26N4S2) has been determined by X-ray crystallographic techniques. The compound crystallizes in the orthorhombic space group Pbca, with unit cell parameters: a = 15.692(3), b = 20.803(8), c = 11.979(6)angstrom, Z = 8, V = 3911(7)angstrom(3). The crystal structure was solved by direct methods and refined by full-matrix least squares to a final R-value of 0.084 for 1447 observed reflections [I > 2 sigma (I)]. In the thiosemicarbazide moiety, the S = C bond length is 1.656(6), N-C-N angle is 115.6(5)degrees. The crystal structure is stabilized by the intermolecular N-H... S hydrogen bonds. (c) 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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    Electron microscopy study of 2H and 18R martensites in Cu-11.92 wt% A1-3.78 wt% Ni shape memory alloy
    (Elsevier Science Sa, 2006) Sari, Uğur; Aksoy, İlhan
    The microstructures and the crystal structures of the beta(1)' and gamma(1)' martensite phases in Cu-11.92 wt% Al-3.78 wt% Ni shape memory alloy were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Samples subjected to two different heat treatments were analysed. In the alloy, two kinds of martensite phases were observed depending on heat treatment, and it was seen that the annealing time is effective on forming of these phases. The change between the 18R and 2H stacking sequences was investigated by diffraction technique. Further experiments revealed that the beta(1)' martensite structure is actually of the M18R type (modified 18R) monoclinic one with its beta angle very close to 90 degrees. (c) 2005 Elsevier B.V. All rights reserved.