Defects in Synthetic Quartz and the Q-Values of the -18.5° X-Cut Bar

Oura, N.; Kuramochi, Naimu; Koshino, Masayoshi; Katsumoto, Toru

doi:10.7567/jjaps.20s3.157

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“…Q-values are much affected by the position of structural defects in the resonator. The greatest loss occurs when the defect in a resonator occupies a position close to the nodal plane of the vibration, where the stress of the vibration is the largest [28]. The relation between Q-value and position of a defect in a resonant bar is shown in Fig.…”

Section: A Dislocationsmentioning

confidence: 99%

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Advances in high-Q piezoelectric resonator materials and devices

Ballato

Gualtieri

1994

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In order to compare piezoelectric materials and devices, an intrinsic parameter, the motional time constant tau(1)/sup (m/)=(omega/sub m/Q/sub m/)(-1) for a particular mode m is employed. The use of tau(1)/sup (m/) follows from the accommodation of acoustic loss in the elastic compliance/stiffness and the establishment of material coefficients that are elements of viscosity matrices. Alternative and fully equivalent definitions of tau(1) are given based on the RC time constant derived from the equivalent circuit representation of a crystal resonator, acoustic attenuation, logarithmic decrement, and viscosity or damping. For quartz devices, the variation of tau(1): for any simple thickness mode, for the Y'X shear mode for rotated Y-cuts, and with diameter-thickness ratio for AT-cuts is discussed. Other factors such as mounting loss and loss caused by crystal inhomogeneities (dislocations, defect positions in the resonator, and impurity migration under vibrational stress) are briefly considered with quartz devices as the model. Some new piezoelectric materials/material constants/devices are reviewed and their motional time constants are compared. A physical parameter, composed of acoustic velocity, piezoelectric coupling, and tau(1) is identified which aids in understanding the maximum frequency limitations of plate resonators.

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Section: A Dislocationsmentioning

confidence: 99%

“…AI-OH Region 1s (3410-3350 cm '1 Relation between Q-values and the position of a defect in a resonator bar. L is the distance from the end of the bar[28].…”

mentioning

confidence: 99%

Advances in high-Q piezoelectric resonator materials and devices

Ballato

Gualtieri

1994

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Defects in Synthetic Quartz and the Q-Values of the -18.5° X-Cut Bar

Cited by 1 publication

References 0 publications

Advances in high-Q piezoelectric resonator materials and devices

Advances in high-Q piezoelectric resonator materials and devices

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