Electric twinning in quartz by temperature gradient

Iliescu, B.; Chirilǎ, R.

doi:10.1002/crat.2170300219

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…USM and AWJM associate a satisfactory surface finishing and mechanical integrity with the absence of localized changes in crystal properties due to thermo-mechanical stress gradients. Thermal gradients generated by electrical sparks or laser beams can nucleate twin domains in ferrobielastic crystals such as quartz [11,12]. Because quartz surface preparation is laborious and expensive, the details of its manufacturing processes are not open and each manufacturer has optimized its own process.…”

Section: Introductionmentioning

confidence: 99%

Multifractal analysis of ultrasonically machined surfaces of cylindrical quartz crystals: the effect of the abrasive grits

Ţălu¹,

Guzzo²,

Astinchap³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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Since synthetic quartz is essential to produce 3-D resonators for numerous applications in precision electronics, in this work the surface topography of cylindrical quartz bars is investigated using the multifractal technique. The cylindrical bars were manufactured with ultrasonic machining using with five SiC grits ranging from 6 to 50 µm. The machined surfaces were initially characterized by contact profilometry and scanning electron microscopy (SEM). The multifractality of the machined surfaces was scrutinized using a box-counting method applied to the images obtained with 500X magnification. The multifractal spectrum indicated that the fractal dimension f(α) and the width of the fractal spectrum Δα are dependent on the grit size, but this dependence is not monotonic. The lowest (negative) value for Δf(α) was found for 25 µm grits indicating that for these grits the lower frequency events (grooves with tens µm width occurring along the USM direction) controls the surface topography much more than high frequency events related to brittle microcracking. The abrasive wear due to the continuous slurry recycling in lateral tool-workpiece interfaces contributed to smooth the groove texture as well as the sharpness of microscopic indentations, which remained observed on the surfaces machined with 50 µm grits. The opposite paths observed for the arithmetical mean deviation of the measured profile (Ra) and Δf(α) parameters with the cutting rate measured for each grit size were valuable to differentiate flat-rough and unlevelled-rough topographies in quartz bars.

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Section: Introductionmentioning

confidence: 99%

Multifractal analysis of ultrasonically machined surfaces of cylindrical quartz crystals: the effect of the abrasive grits

Ţălu¹,

Guzzo²,

Astinchap³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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Anisotropic viscoelastic properties of quartz and quartzite in the vicinity of the α–β phase transition

Klumbach

Schilling

2017

Phys Chem Minerals

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Dynamics of the dauphine twins in quartz crystal up to the transition point

Iliescu¹,

Enculescu²,

Chirilǎ

1997

Ferroelectrics

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The paper presents two original methods for obtaining electrical twins up to the transition point in quartz crystal: a) thermal treatment in a temperature gradient of 10-1.5 degreekm at about 5OO0C and b) applying an electric field of 14kVkm at 50OoC. The twinning time dependence on the temperature, the dynarmc of twin domain formation as a function of directions. thickness. temperature gradient, for +SX resonator plates are discussed. The influence of the Dauphine tuins on the performances of piezoelectric resonators: resonant frequency. dynamic inductance and equivalent dynamic capacity was previously reported [I].This paper presents the influence of twinning area on the frequency spectrum of a resonator plate of + 5 X a t and the changing of the frequency-temperature characteristic urhen the resomtor plate becomes minned.

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Electric twinning in quartz by temperature gradient

Cited by 3 publications

References 9 publications

Multifractal analysis of ultrasonically machined surfaces of cylindrical quartz crystals: the effect of the abrasive grits

Multifractal analysis of ultrasonically machined surfaces of cylindrical quartz crystals: the effect of the abrasive grits

Anisotropic viscoelastic properties of quartz and quartzite in the vicinity of the α–β phase transition

Dynamics of the dauphine twins in quartz crystal up to the transition point

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