Acoustic dissipation associated with phase transitions in lawsonite, CaAl2Si2O7(OH)2{middle dot}H2O

McKnight, Ruth E. A.; Carpenter, Michael A.; Darling, T. W.; Buckley, A.; Taylor, Paul A.

doi:10.2138/am.2007.2568

Cited by 115 publications

(106 citation statements)

References 30 publications

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“…Polycrystalline samples prepared by hot pressing have also been examined at room temperature and in-situ at high pressures by the pulse-echo ultrasonic method at frequencies of ~10-70 MHz (Carpenter et al, 2007). The same pattern of stiff cubic and orthorhombic samples plus soft tetragonal samples was observed at room temperature.…”

Section: Introductionmentioning

confidence: 86%

“…Page 9 of 34 A c c e p t e d M a n u s c r i p t 3 attracted interest as a potential analogue system for the structure, properties and behaviour of (Mg,Fe)SiO 3 and CaSiO 3 perovskites at high pressures and temperatures (Qin et al, 2000(Qin et al, , 2002Carpenter et al, 2001Carpenter et al, , 2007Harrison et al, 2003;Carpenter, 2007a,b). In this context, the most significant issues relate to how the elastic properties vary with pressure, temperature and structure type and, in particular, to whether there are any anomalies in elastic constants or mechanical quality factor, Q, which might lead to a better understanding of the seismic properties of the lower mantle.…”

Section: Introductionmentioning

confidence: 99%

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Elastic and anelastic anomalies in (Ca,Sr)TiO3 perovskites: Analogue behaviour for silicate perovskites

Walsh

Taylor

Buckley

et al. 2008

Physics of the Earth and Planetary Interiors

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Elastic and anelastic anomalies in (Ca,Sr)TiO3 perovskites: Analogue behaviour for silicate perovskites

Walsh

Taylor

Buckley

et al. 2008

Physics of the Earth and Planetary Interiors

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“…In the low temperature head the sample was placed lightly across a pair of faces between the two transducers in a mount which was lowered vertically into a helium flow cryostat, as described by McKnight et al [45]. The sample chamber was filled with a few mbar of helium to allow heat exchange between the sample and the cryostat.…”

Section: Low Temperaturementioning

confidence: 99%

Elastic anomalies associated with structural and magnetic phase transitions in single crystal hexagonal YMnO₃

Thomson

Chatterji

Howard

et al. 2014

J. Phys.: Condens. Matter

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Resonant ultrasound spectroscopy has been used to measure the elastic and anelastic behaviour through known structural and magnetic phase transitions in single crystal hexagonal YMnO 3 . Anomalous elastic behaviour is observed at the high temperature structural transition at ∼1260 K, with a discontinuity in the elastic constants and nonlinear recovery below T c , consistent with λeQ 2 s coupling. There is no change in dissipation associated with this high temperature transition, and no evidence in the elastic or anelastic behaviour for any secondary transition at ∼920 K, thus supporting the thesis of a single high temperature transformation. Elastic stiffening is observed on cooling through T N , in accordance with previous studies, and the excess elastic constant appears to scale with the square of the magnetic order parameter. The strains incurred at T N are a factor of ∼20 smaller than those at the structural transition, implying very weak λeQ 2 m coupling and a dominant contribution to the variation in the elastic constants from λe 2 Q 2 m . The increased acoustic dissipation above T N is consistent with an order-disorder process.

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“…RUS is used to measure the resonant frequencies of normal modes of vibration of a material in the frequency region ∼ 0.1-2 MHz. In the low-temperature RUS arrangement used for the experiments described here, the sample sat lightly between piezoelectric transducers in a sample holder, which was lowered into an orange helium flow cryostat with a few mbars of helium as exchange gas [32]. Acoustic resonances of the sample were excited by sending an ac electric signal to one of the transducers, and were detected by the second transducer.…”

Section: Methodsmentioning

confidence: 99%

Avalanche criticalities and elastic and calorimetric anomalies of the transition from cubic Cu-Al-Ni to a mixture of18Rand2Hstructures

et al. 2016

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We studied the two-step martensitic transition of a Cu-Al-Ni shape-memory alloy by calorimetry, acoustic emission (AE), and resonant ultrasound spectroscopy (RUS) measurements. The transition occurs under cooling from the cubic (β, F m3m) parent phase near 242 K to a mixture of orthorhombic 2H and monoclinic 18R phases. Heating leads first to the back transformation of small 18R domains to β and/or 2H near 255 K, and then to the transformation 2H to β near 280 K. The total transformation enthalpy is H T = 328 ± 10 J/mol and is observed as one large latent heat peak under cooling. The back-transformation entropy under heating breaks down into a large component 18R to β at 255 K and a smaller, smeared component of the transformation 2H to β near 280 K. The proportions inside the phase mixture depend on the thermal history of the sample. The elastic response of the sample is dominated by large elastic softening during cooling. The weakening of the elastic shear modulus shows a peak at 242 K, which is typical for the formation of complex microstructures. Cooling the sample further leads to additional changes of the microstructure and domain wall freezing, which is seen by gradual elastic hardening and increasing damping of the RUS signal. Heating from 220 K to room temperature leads to elastic anomalies due to the initial transformation, which is now shifted to high temperatures. The transition is smeared over a wider temperature interval and shows strong elastic damping. The shear modulus of the cubic phase is recovered at 280 K. The phase transformation leads to avalanches, which were recorded by AE and by time-resolved calorimetry. The cooling transition shows very extended avalanche signals in calorimetry with power-law distributions. Cooling and heating runs show AE signals over a large temperature interval above 260 K. Splitting the transformation into two martensite phases leads to power-law exponents ε ∼ 2 (β ↔ 18R) and ε ∼ 1.5 (β ↔ 2H ) while the phase mixture shows an effective AE exponent of 1.7.

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Acoustic dissipation associated with phase transitions in lawsonite, CaAl2Si2O7(OH)2{middle dot}H2O

Cited by 115 publications

References 30 publications

Elastic and anelastic anomalies in (Ca,Sr)TiO3 perovskites: Analogue behaviour for silicate perovskites

Elastic and anelastic anomalies in (Ca,Sr)TiO3 perovskites: Analogue behaviour for silicate perovskites

Elastic anomalies associated with structural and magnetic phase transitions in single crystal hexagonal YMnO₃

Avalanche criticalities and elastic and calorimetric anomalies of the transition from cubic Cu-Al-Ni to a mixture of18Rand2Hstructures

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Acoustic dissipation associated with phase transitions in lawsonite, CaAl2Si2O7(OH)2{middle dot}H2O

Cited by 115 publications

References 30 publications

Elastic and anelastic anomalies in (Ca,Sr)TiO3 perovskites: Analogue behaviour for silicate perovskites

Elastic and anelastic anomalies in (Ca,Sr)TiO3 perovskites: Analogue behaviour for silicate perovskites

Elastic anomalies associated with structural and magnetic phase transitions in single crystal hexagonal YMnO3

Avalanche criticalities and elastic and calorimetric anomalies of the transition from cubic Cu-Al-Ni to a mixture of18Rand2Hstructures

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Elastic anomalies associated with structural and magnetic phase transitions in single crystal hexagonal YMnO₃