Impurities and Anelasticity in Crystalline Quartz

Fraser, David B.

doi:10.1016/b978-0-12-395665-1.50014-7

Cited by 37 publications

(5 citation statements)

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“…T he acoustic attenuation, in terms of \ / Q ,of a q u artz crystal vibra against tem perature in figure 12. A m axim um of attenuation is observed at 20 K. This corresponds to a m axim um of phonon interaction (Fraser 1968).…”

Section: Impurities and Fluctuationsmentioning

confidence: 86%

Acoustic resonance techniques for temperature, stress and impurity characterization in piezoelectric materials

1986

Phil. Trans. R. Soc. Lond. A

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The resonance frequency of a vibrating structure is sensitive to thermal, mechanical, or electrical perturbations. On account of the high resolution allowed by frequency measurements, very small temperature gradients and stresses can be detected and measured in piezoelectric, and mainly in quartz resonators. Because of piezoelectric coupling, frequency is also sensitive to the relaxation of ionic impurities. The resonant method gives access to the nature and the concentration of the impurities. The interactions between thermal phonons also are characterized, by means of noise measurements and some interpretation of the mechanisms of 1/ f noise will be presented.

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Section: Impurities and Fluctuationsmentioning

confidence: 86%

Acoustic resonance techniques for temperature, stress and impurity characterization in piezoelectric materials

1986

Phil. Trans. R. Soc. Lond. A

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“…Traces of magnetic impurities have been observed in pure synthetic quartz crystals using whispering gallery microwave modes [28], and has been shown to be the mechanism for the largest magnetic response of the crystal material. Furthermore, the temperature dependence of mechanical Quality factors of quartz resonators showed a relaxation phenomenon due to the presence of Na + , Al 3+ ions substituting some Silicon ions in the lattice [31][32][33][34][35][36]. These and other impurities in quartz have been a subject of extensive studies in literature [37,38].…”

Section: Discussionmentioning

confidence: 99%

Observation of low-temperature magnetomechanic effects in crystalline resonant phonon cavities

2019

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We observe magnetic effects in ultra-high quality factor crystalline quartz Bulk Acoustic Wave resonators at milli-Kelvin temperature. The study reveals existence of hysteresis loops, jumps and memory effects of acoustical resonance frequencies. These loops arise as a response to the external magnetic field and span over few Hertz range for modes with linewidths of about 25mHz, which constitute a frequency shift of order 60 linewidths. The effects are broadband but get stronger towards higher frequencies where both nonlinear effects and losses are limited by two level systems. This suggests that the observed effects are due to ferromagnet-like phase of a spin ensemble coupled to mechanical modes. The observed coupling between mechanical and spin degrees of freedom in the ultra low loss regime brings new possibilities for the emerging class of quantum hybrid systems.

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“…However, the actual mechanism involved in withdrawing the hydrogen ion from water is riot clear, but it may be related to some type of surface catalysis. It has been reported by some authors 1 that it is more difficult to sweep quartz under high vacuum. The formatijn of color centers in vacuun sweeping has also been reported.…”

Section: Previous Studiesmentioning

confidence: 98%