The development of advanced piezoelectric α-quartz microelectromechanical system (MEMS) for sensing and precise frequency control applications requires the nanostructuration on-chip integration this material on silicon material. However, current quartz manufacturing methods are based bonding bulk micromachined crystals silicon, which limits size, performance, cost, scalability microdevices. Her...

Single crystals of a new iron-based superconductor Ba2Ti2Fe2As4O have been grown successfully via a Ba2As3-flux method in a sealed evacuated quartz tube. Bulk superconductivity with Tc ∼ 21.5 K was demonstrated in resistivity and magnetic susceptibility measurements after the as-grown crystals were annealed at 500 °C in vacuum for a week. X-ray diffraction patterns confirm that the annealed and...

Synneusis, the drifting together and systematic attachment of crystals in a melt, is involved in three of the known origins for mantled feldspars: (1) overgrowth, (2) exsolution, and (3) filling of skeletal plagioclase. Quartz latite dikes of the Chocolate Mountains, California, contain plagioclase crystals in parallel and twinned synneusis. Sanidine mantles consisting of segments, each crystal...

The energy resolution of the hadronic calorimeters is mostly limited by the fluctuation of the electromagnetic component in the development of the shower. The dual readout technique proposed by DREAM aims to correct event by event for this fluctuation measuring at the same time scintillation and Cherenkov light. In the last years the DREAM Collaboration has performed several tests to exploit th...

Interfacial reaction between quartz and potassium silicate glass was studied at both 900 °C 1000 °C. The results showed that no phase transformation observed for the pure or Instead, particles in K2O-SiO2 glass, from to cristobalite occurred quartz/glass interface first, then crystals transformed into tridymite. tridymite formed became site of heterogeneous nucleation, which induces plenty prec...

We examined the processes of calcite nucleation and crystal growth to determine the dominant mechanism for precipitation of calcite in the presence of dissolved organic carbon (DOC). Our experiments, conducted at 25°C and at a Ca:HCO, molar ratio of 1:2, were performed with and without calcite seeds. Scanning electron micrograph observations showed that the particle size of calcite crystals in ...

The purpose of this paper is to show how systems composed of multiple oscillators and resonators can achieve superior performance compared to a single oscillator. Experimental results are presented for two systems based on quartz crystals which provide stateof-the-art stability over a much wider range of averaging times than has been previously achieved. One system has achieved a factor of five...