Polycrystalline samples of dimeric cadmium tartrate, [(Cd,C4H4O6)2H2O)]3H2O [labeled CdT(I)], were studied using impedance measurements and x-ray powder diffraction. The dependence of the real part of the dielectric constant on temperature showed a sharp peak at about 65 °C, revealing a structural phase transition, while the other broad peak in the temperature range (70<T<85 °C) was due to the loss of water molecules. The x-ray powder diffraction patterns at three temperatures (25, 60, and 70 °C) are consistent with three nonequivalent space groups. According to these results, it seems that this compound undergoes two successive phase transitions: P212121→P21→Pnmn, suggesting an intermediate ferroelectric behavior, labeled CdT(II) between a paraelectric CdT(I) and an anhydrous phase, labeled CdT(III).
The paper reports on the growth of single crystals of zinc tartrate, by reaction of aqueous solutions of tartaric acid (L+) and zinc chloride in silica gels. The grown crystals have been characterized by X-ray, infrared spectroscopy, qualitative elemental analysis, thermoanalytical techniques, and electromagnetic studies.En este articulo se describe el crecimiento de monocristales de tatrato de zinc, por reaccion de soluciones acuosas de acido tartaric0 (L+) y cloruro de zinc en geles de silice. Los cristales crecidos han sido caracterizados por rayos-X, espectroscopia infrarroja, analisis elemental cualitativo, tecnicas termoanaliticas y estudios electromagneticos.
The preparation, characterization (UV/VIS, IR, Mass, 'HNMR, and 13CNMR-DEPT, heteronuclear multiple quantum correlation (HMQC), X-ray diffraction and DSC), measurements of optical second-harmonic generation SGH and dielectric studies of 3-acetamide-4-N-cyclooctylamine-nitrobenzene (ACN), a new organic molecular crystal with potential applications in nonlinear optics are reported.Se describe la preparacion, caracterizaci6n (UV/VIS, IR, Mass, 'HNMR and I3CNMR-DEPT, HMQC, difracci6n de rayos X y DSC), medidas sobre generaci6n de segundos arm6nicos GSA y estudios diel6ctrieos sobre el 3-acetamido-4-N-ciclooctilamino-nitrobenceno (ACN), un nuevo cristal molecular orginico con potenciales aplicaciones en 6ptica no lineal.
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