Piezoelectric quartz SiO2 crystals are widely used in industry as oscillators. As a natural mineral, and its relevant silicates also of interest geoscience mineralogy. However, the nucleation growth is difficult to control not fully understood. Here we report successful solid state crystallization thin film amorphous GeO2 into on various substrates including Al2O3, MgAl2O4, MgO, LaAlO3 SrTiO3. ...

The 'rigid-unit mode' (RUM) model requires unit blocks, in our case tetrahedra of SiO(4) groups, to be rigid within first order of the displacements of the oxygen ions. The wavevectors of the lattice vibrations, which obey this rigidity, are determined analytically. Lattices with inversion symmetry yield generically surfaces of RUMs in reciprocal space, whereas lattices without this symmetry y...

Fragmentation of crystals is an important mechanism, and a component of particle dynamics in igneous and metamorphic rocks that has received surprisingly little attention. Recent advances in textural analysis, extraction techniques, digital imaging, and computer-assisted measurements enable rapid accumulation of 3D data on particle shapes and size distributions. This paper reviews fragment size...

Monazite-(Ce) and xenotime-(Y) were found in the metacherts (pumpellyite–actinolite-facies conditions: 3 ≤ P ≤ 4 kbars and 300 ≤ T ≤ 350°C) of the Monte Figogna Unit, Sestri–Voltaggio Zone, Liguria, in Italy, as scattered submillimetric grains in pelitic beds and as euhedral crystals in both millimeter-thick quartz veins and open fissures. Their composition is comparable to those of known occur...

In this laboratory, entanglement as one of the key concepts in quantum mechanics was introduced, and we concentrated on the polarized entangled photons. Bell’s inequality was used as a criterion of quantum and classic. The polarized entangled photons were created by Spontaneous Parametric Down-Conversion in Beta Barium Borate crystals. The coincidence counts were measured as the number of entan...

Two quartz (10-11) crystals were cylindrically bent to a 25.4 cm radius of curvature and were mounted in identical Cauchois-type transmission spectrometers, and the crystal diffraction efficiencies were measured to 5% absolute accuracy using narrow bandwidth x-ray source fluences in the 20 to 80 keV energy range. The measured integrated reflectivity values were compared to calculations performe...

An electronic nose based on coated piezoelectric quartz crystals was used to distinguish cheese made from ewes' milk, and to distinguish cheese varieties. Two sensors coated with Nafion and Carbowax could certify half the ewes' cheese samples, exclude 32 cheeses made from cow's milk and to classify half of the ewes' cheese samples as possibly authentic. Two other sensors, coated with polyvinylp...

(Hg,Re)Ba2CaCu2Oy thin films have been fabricated on Ag by reacting laser deposited ReBaCaCuO precursor films with CaHgO2 in sealed quartz tubes. The as-prepared films exhibit excellent phase purity and c-axis texture, characterized by an onset superconducting transition temperature (Tc) of 124 K. The microstructures of the films examined by environmental scanning electron microscope revealed H...

Polarization-entangled photon pairs are generated using crossed Beta Barium Borate crystals analogous to Dehlinger and Mitchell’s method. The polarization state of the entangled pairs is projected onto the basis of two polarizers introduced in the signal and idler arms. The cosine-squared dependance of the probability amplitude of the entangled state on the relative polarizer angle is theoretic...