Quartz single crystal

The quartz crystal micro-balance (QCM), the most extensively studied shear mode AT-cut quartz resonator, is comprised of a thin slice of quartz single crystal with two metal electrodes deposited on both faces of the crystal. These excitation electrodes generate a transverse shear wave across the thickness of the crystal that propagates into the film immobilized onto the crystal surface. When the over-layer is non-rigidly coupled to the... 

Doukhan, J. C., Trepied, L. (1985). Plastic deformation of quartz single crystals. Bull. Mineral., 108, 97-123. 

Figure 27. Analysis of polarized EXAFS data, (a) EXAFS radial structure functions for irom oxide precipitates on quartz single crystal surfaces, r and m refer to the (1011 )and (1120) surface planes of quartz. The parallel and perpendicular refer to the polarization direction of the X-ray beam and thus the probe direction of the EXAFS scattering process, (b) Raw polarized EXAFS and fits for the same samples in (a), (c) Polarized stracture function simulations. Top radial stracture function for a single Fe atom within a 50-atom hematite crystal with [0001] orientation. Middle Same for 20-atom crystal. Bottom Weighted average of all Fe stracture func-tions in the 20-atom crystal. The analysis suggests highly textrrred hematite-like nanocrystals on the quartz surface but no epitaxial relationship. From Waychunas et al. (1999).

Figure 4.2 Influence of the atmosphere in the beam path on the background, measured with a quartz single crystal sample holder (above in air, below in helium).

By using appropriate calibration (e.g., a quartz single-crystal plate) the off diagonal susceptibility (or sp sp deduced directly from these... 

Silicon Dioxide. The nature of the a-j8 transition in quartz has been considered it occurs in a temperature interval of >0.05 K and is characterized by temperature hysteresis (1.4 0.3K). The nature of the defects produced in non-crystalline Si02 and o-quartz single crystals by fast neutron irradiation has... 

X-ray diffraction experiments (XRD) are perfonned on a curve position sensitive detector INEL CPS 120 which allows a simultaneous collection of diffracted beams in the range 5° < 20 < 125°, with the monocliromatized CuKal radiation (X=1,5406A, CGR focusing quartz single crystal). 

The cascading effects in third harmonic generation with a buik a-quartz single crystal have been studied by Meredith The third harmonic frequency is obtained not only by a direct tripling of fundamental one but also by addition of fundamental w frequency with medium polarization at 2(o. There exists an additionai source polarization at 3w frequency given by... 

The characteristic glow curve of DQ12 annealed in air at 520 K for 24 h after X-raying (30 kV, 45 mA, 1 min) at 133 K as depicted by Kriegseis et al. (1977) is comparable to thermally stimulated luminescence curves which have been obtained by other authors from natural crystalline and amorphous SiO samples as well as synthetic quartz single crystals (Medlin 1963, Schlesinger 1965, Halperin et al. 1979, Mattern 1973). 

Quartz Microbalance and Direct Microbalance Techniques. These methods provide direct measurements of the adsorbed mass. The vibration frequency of a quartz single crystal is very sensitive to the mass of the crystal. Upon adsorption, the vibration frequency shifts to lower values and the changes in the frequency can be related to the adsorbed mass. The surface excess can be determined by dividing the adsorbed mass by the surface area (6). Another method to directly measure the surface excess is the microbalance technique. In this technique, the... 

Similar diffiisivities were obtained for both synthetic and natural quartz, and for a range of Ti source materials, including natural titanite powder and rutile-quartz single crystal diffusion couples. Although Ti diffusion appeared to be slightly slower in the direction normal to c, this difference was not great. 

For sample containment, there are several materials (e.g. quartz, single-crystal Si), that give very little absorption or scattering of neutrons. For SAXS on the... 

The present, most widely used, method of regulating modem timepieces is a quartz crystal. A properly oriented quartz single crystal will expand and contract at a very precise frequency when subjected to an oscillating voltage produced by an inductive-capacitive (L-C) circuit oscillating at about the same frequency as the crystal. The crystal fine-tunes the oscillating frequency of the current [f = 2n LCf where L is the... 

Fig. 9. Axial creep rates for wet synthetic quartz single crystals deformed in orientations to promote...

Quartz Crystal Microbalance (QCM) and Direct Microbalance Techniques provide measurements of the adsorbed mass. In the QCM technique, adsorbed mass is determined from the shifts of vibration frequency of a quartz single crystal to lower values as a result of pol3rmer adsorption (80). In the microbalance technique, microbalances with sensitivity of 10 " mg are used to determine the change in mass of a substrate due to adsorption (81). 

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