A new design of automated piezoelectric composite oscillator technique

Kustov, S.; Golyandin, S.; Ichino, A.; Gremaud, G.

doi:10.1016/j.msea.2006.02.230

Cited by 45 publications

(29 citation statements)

References 17 publications

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“…The technique employs a classical three component resonant Piezoelectric Ultrasonic Composite Oscillator [29,30] with an additional channel to register periodic flux density induced in a sample by oscillatory stress/strain. The samples usually are half-wave length rods performing longitudinal resonant oscillations in the fundamental mode.…”

Section: Methodsmentioning

confidence: 99%

“…The experimental setup operated at a frequency around 90 kHz, covering the ranges of ε 0 between 10 −7 and 10 −4 , temperature T from 77 to 400 K and the axial magnetic field H up to 18 kA/m. A description of the method and experimental setup can be found elsewhere [27][28][29][30]. In the present work B 0 (T) continuous spectra were registered between 250 and 80 K (cooling the sample below T C ) and between 250 and 95 K (thermal cycle in the AFM phase) for constant values of H, and ε 0 fixed at 10 −5 .…”

Section: Methodsmentioning

confidence: 99%

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Low Field Magnetic and Thermal Hysteresis in Antiferromagnetic Dysprosium

Liubimova

Moyà

Torrens‐Serra

et al. 2017

Metals

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Magnetic and thermal hysteresis (difference in magnetic properties on cooling and heating) have been studied in polycrystalline Dy (dysprosium) between 80 and 250 K using measurements of the reversible Villari effect and alternating current (AC) susceptibility. We argue that measurement of the reversible Villari effect in the antiferromagnetic phase is a more sensitive method to detect magnetic hysteresis than the registration of conventional B(H) loops. We found that the Villari point, recently reported in the antiferromagnetic phase of Dy at 166 K, controls the essential features of magnetic hysteresis and AC susceptibility on heating from the ferromagnetic state: (i) thermal hysteresis in AC susceptibility and in the reversible Villari effect disappears abruptly at the temperature of the Villari point; (ii) the imaginary part of AC susceptibility is strongly frequency dependent, but only up to the temperature of the Villari point; (iii) the imaginary part of the susceptibility drops sharply also at the Villari point. We attribute these effects observed at the Villari point to the disappearance of the residual ferromagnetic phase. The strong influence of the Villari point on several magnetic properties allows this temperature to be ranked almost as important as the Curie and Néel temperatures in Dy and likely also for other rare earth elements and their alloys.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Low Field Magnetic and Thermal Hysteresis in Antiferromagnetic Dysprosium

Liubimova

Moyà

Torrens‐Serra

et al. 2017

Metals

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show abstract

“…The logarithmic decrement δ, defined as δ = ∆W/2W, where ∆W is the energy dissipated per cycle and W is the maximum stored vibrational energy, was used as a measure of the IF. A computer-controlled setup [20] enabled us to measure quasi-simultaneously temperature dependences of the IF and Young's modulus at two values of oscillatory strain amplitude. At a low value of strain amplitude (10 −6 ), we monitored the linear (strain amplitude-independent) behaviour of the IF and Young's modulus.…”

Section: Methodsmentioning

confidence: 99%

Effect of Hydrogen on the Elastic and Anelastic Properties of the R Phase in Ti50Ni46.1Fe3.9 Alloy

Sapozhnikov

Torrens‐Serra

Cesari

et al. 2017

Metals

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Abstract:The linear and non-linear internal friction, effective Young's modulus, and amplitude-dependent modulus defect of a Ti 50 Ni 46.1 Fe 3.9 alloy have been studied after different heat treatments, affecting hydrogen content, at temperatures of 13-300 K, and frequencies near 90 kHz. It has been shown that the contamination of the alloy by hydrogen gives rise to an internal friction maximum in the R martensitic phase and a complicated pinning stage in the temperature dependence of the effective Young's modulus at temperatures corresponding to the high-temperature side of the maximum. Dehydrogenation of the H-contaminated alloy transforms the internal friction maximum into a plateau and minimizes the pinning stage. The internal friction maximum is associated with a competition of two different temperature-dependent processes affecting the hydrogen concentration in the core regions of twin boundaries. The amplitude-dependent anelasticity of the R phase is also very sensitive to hydrogen content, its temperature dependence reflects the evolution of extended hydrogen atmospheres near twin boundaries.

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“…Recently, combining high precision PUCOT technique operating at a frequency of around 100 kHz [10] with magnetic measurements has been suggested [8], enabling this way parallel investigations of elastic, anelastic properties and magnetoelastic coupling in ferromagnets. Fig.…”

Section: Experimental Studies Of the Inverse Magnetostrictionmentioning

confidence: 99%

“…The experimental technique is based on the piezoelectric composite oscillator technique (PUCOT) [9,10], combined with the measurements of the inverse magnetostriction effect, also known as Villari effect.…”

Section: Introductionmentioning

confidence: 99%