Good quality and optically transparent single crystals of pure and doped glycine phosphite (GPI) were grown by both solvent-evaporation and temperature-cooling techniques. Dopants were chosen in different categories, namely transition metals (Cr, Mn, Co, Ni, Zn, Mg, Cd), rare-earth metals (Ce, Nd, La), dyes (rhodamine B, malachite green, fluorescein) and an amino acid (l-proline). The concentration of dopants was chosen depending on the category of dopants and the quality of crystallization during the growth process. The crystalline perfection of the as-grown pure and doped GPI crystals was investigated by high-resolution X-ray diffraction at room temperature. A multicrystal X-ray diffractometer employing a well collimated and highly monochromated Mo Kα1 beam and set in the (+, −, −, +) configuration was employed. Most of the crystal specimens show excellent crystalline perfection. However, grain boundaries, low-angle tilt boundaries, and vacancy and interstitial point defects were observed in some crystal specimens.

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Study of the influence of dopants on the crystalline perfection of ferroelectric glycine phosphite single crystals using high-resolution X-ray diffraction analysis

Growth and characterization of ferroelectric glycine phosphite single crystals

The effect of shells of various thicknesses on the vibrational resonant Raman spectra of CdSe/ZnS core-shell nanoparticles is studied The dependence of the core-shell structure on the method of shell deposition is derived from a comparison of the vibrational and photoluminescence spectra of nanoparticles Along with the appearance of peaks attributed to the shell, the phonon spectrum of the core undergoes significant changes upon shell growth The change of the CdSe LO peak lineshape in core-shell nanoparticles is discussed with respect to possible changes in the spectrum of both optical and acoustical phonons upon shell formation Based on the observed decrease of the CdSe 2LO/LO peak intensity ratio, a weakening of exciton coupling to the CdSe LO phonon upon ZnS shell deposition is supposed The change in the carrier localization volumes upon shell formation is discussed as a possible reason for the reduced coupling

https://iopscience.iop.org/article/10.1088/0957-4484/20/36/365704/pdf

The influence of shell parameters on phonons in core-shell nanoparticles: a resonant Raman study.

Classification and nature of hydrogen bonds to betaine. X-ray, 13 C CP MAS and IR description of low barrier hydrogen bonds

Polarised IR and Raman spectra of the γ-glycine single crystal

Ferroelectricity in Gly · H3PO3 crystal

Polarised FTIR and Raman spectra of betaine phosphite single crystal I. Paraelectric phase

In this paper, the problem of electron-phonon interaction (EPI) in semiconductor crystals and quantum dots (QDs) is considered. It is shown that the model of strong EPI developed for organic molecular crystals can be successfully applied to bulk and nanosized semiconductors. The idea of the approach proposed here is to describe the experimental Raman (or absorption) spectra containing the phonon replicas theoretically by varying the EPI constant. The main parameter of the theoretical expression describing the experimental spectrum is the ratio of EPI constant to the frequency of the corresponding phonon mode. Based on the experimental and theoretical results, we have found that decreasing the size of CdSxSe1-x QDs embedded in borosilicate glass matrix results in some enhancement of electron-phonon interaction.

http://www.journal-spqeo.org.ua/n2_2007/v10n2-07-p01-05.pdf

M. Drozd

Papers

Ferroelectricity in Gly · H3PO3 crystal

Polarised FTIR and Raman spectra of betaine phosphite single crystal I. Paraelectric phase

Investigation of electron-phonon interaction in bulk and nanostructured semiconductors