Sound propagation at GHz frequencies in aqueous LiCl solutions

The algorithm for calculating the technological parameters of formation of domain structures in ferroelectrics by the acoustic-interference method is developed. The basic parameters for c-axis-oriented PZT films grown on metallic substrates are estimated. It is shown that the use of the acoustic-interference method allows one to form regular domain structures in PZT films with record-breaking short work cycle duration t ≤ 0.25 μs.

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“…We used a fused silica as a material of the acoustic element 3. In our calculations, the following parameter values were used [11,12]:…”

Section: Algorithm For Calculating the Basic Parameters Of Rds Formationmentioning

confidence: 99%

Quick Formation of Micro- and Nanodomain Structures in Ferroelectrics by Microwave Ultrasound Interference

2015

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“…Relations (4)-(6) are testable through measurements of susceptibilities as a function of frequency and temperature. We use complex compressibility modulus data, determined from ISS, Brillouin scattering [12,13], and ultrasonics [13], as well as electrical modulus data [14] to test these results. Our analysis involves no empirical relaxation functional forms, extrapolations to determine the low-frequency Mo(T) and high-frequency Moo(T) limiting values of the moduli, or interpolations between values of M(co) determined at widely different frequencies (to connect gaps of one or more decades in co).…”

Section: With Jab a Nonergodicity Parameter A^g?) A Critical Amplitumentioning

confidence: 99%

Time-resolved spectroscopy and scaling behavior in LiCl/H2O near the liquid-glass transition

Halalay

Nelson

1992

Phys. Rev. Lett.

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Time-domain light scattering experiments on ps-/xs time scales have been conducted on a concentrated aqueous LiCl solution. Analysis of mechanical and electrical modulus spectra confirms some results of mode-coupling theory: simple scaling for a peaks and property-independent power laws. This is made without any assumptions about the data which are not derived from theory. A new characteristic time scale, reflecting the short-and intermediate-range ordering dynamics, is also observed.PACS numbers: 64.70.Pf, 65.70.+y, 78.47.+p During the past decade the study of the liquid-glass transition has taken a new impetus, sparked by the emergence of new theoretical and experimental approaches [ll. Of great interest is the mode-coupling theory (MCT) [2][3][4][5] which has generated a new way of thinking about this difficult problem. Traditionally, the emphasis in the analysis of susceptibility data has been on the different relaxation peaks. MCT shifts the focus to the wings and to the minimum between the a and ft relaxations, for which it makes quantitative predictions. Their experimental verification requires measurements over many decades in time scale. Large bandwidth electrical susceptibility measurements have been possible for decades, but mechanical measurements in the MHz-GHz range (relevant to MCT) have been difficult. We present here impulsive stimulated light scattering (ISS) data from an aqueous LiCl solution, as well as a novel analysis of mechanical and electrical susceptibility data for supercooled liquids.Descriptions of the theoretical underpinnings of the ISS technique and its experimental implementations are given elsewhere [6,7]. Briefly, two X L =1064 nm, 100 ps, parallel polarized laser pulses crossed at an angle 6g were used for transient grating excitation of both longitudinal acoustic waves and the thermal diffusion mode at the grating wave vector q = s (47rA£)sin(0£/2). The timedependent diffraction of a variably delayed 532-nm probe pulse was then measured. We used seven scattering angles between 1° and 60°, yielding acoustic wavelengths of 62.8, 30.8, 14.1, 7.53, 3.96, 1.94, and 1.07 pm and frequencies from 25 MHz to 4 GHz. The electrolyte LiCl/H 2 0 13 mol% was studied for 70 < T < 300 K. This concentration is situated between the equilibrium (12.5 mol%) and the lower nonequilibrium (14.5 mol%) eutectic concentrations [8]. The calorimetric glass transition temperature is T g = 135 K.Typical ISS data are displayed in Fig. 1. All exhibit damped acoustic oscillations (the transient response to sudden heating) and a steady-state density modulation (caused by thermal expansion at grating maxima and compression at nulls) which decays due to thermal diffusion. The trends in acoustic frequency and attenuation rate are as expected and observed in other glassforming materials [9]. Between 165 and 200 K the steady-state response shows additional temporal features. There is a gradual rise in signal, which can be thought of as time-dependent thermal expansion and which reflects slow components of structu...

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Time-resolved measurements of scaling behavior in LiCl/H2O near the liquid-glass transition

Halalay

Yang

Nelson

1994

Journal of Non-Crystalline Solids

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Sound propagation at GHz frequencies in aqueous LiCl solutions

Cited by 8 publications

References 3 publications

Quick Formation of Micro- and Nanodomain Structures in Ferroelectrics by Microwave Ultrasound Interference

Quick Formation of Micro- and Nanodomain Structures in Ferroelectrics by Microwave Ultrasound Interference

Time-resolved spectroscopy and scaling behavior in LiCl/H2O near the liquid-glass transition

Time-resolved measurements of scaling behavior in LiCl/H2O near the liquid-glass transition

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