Structural, textural, and chemical controls on the OH stretching vibrations in serpentine-group minerals

Correlation between the Radiation Induced Colours and the OH-stretching Vibrations of Amazonite

The colours of many feldspars are enhanced by natural radiation. The same phenomenon can be simulated by X-ray radiation in the laboratory. The changes of colour and the formation of defect centers in different feldspars including one microcline (amazonite) after X-ray irradiation has been investigated using e.p.r. spectroscopy [1]. The main colours of amazonite are green, bluish green and blue...

Chemical Weathering of the Mafic Minerals Serpentine and Olivine in Natural Environments

Characterization of Chrysotile, Antigorite and Lizardite by Ft-raman Spectroscopy

We analyzed samples of antigorite, lizardite and fibrous chrysotile, three representative minerals of the serpentine group, to determine their chemical and structural properties, and their FT-Raman spectra. The low-frequency region of the spectrum (1200– 200 cm–1), which corresponds to the lattice-vibration modes, was then analyzed, and the observed bands attributed, on the basis of our results...

the u.s. policy in central asia and its impact on the colored revolutions in the region (the case study of tulip revolution in kyrgyzstan)

چکیده ندارد.

Role of carboxylate chelating agents on the chemical, structural and textural properties of hydroxyapatite.

Organically-modified hydroxyapatite materials were synthesized through the addition of oxalic, succinic, adipic and citric acids to a calcium hydroxide solution before neutralization by ammonium dihydrogenphosphate. All carboxylic acids have a significant influence on apatite crystallinity and nanoparticle size, as indicated by XRD and TEM. Chemical and thermogravimetric analyses as well as FTI...