Elastic and anelastic relaxations associated with the incommensurate structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Pr</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.48</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Ca</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.52</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>MnO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Carpenter, Michael A.; Howard, Christopher; McKnight, Ruth E. A.; Migliori, A.; Betts, J. B.; Fanelli, Victor

doi:10.1103/physrevb.82.134123

Cited by 32 publications

(45 citation statements)

References 122 publications

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“…The remaining parameters of the equation of state have the values of 2062.1 kbar for the bulk modulus, and 3.3 and 3.1 for its first derivative, K 0 calculated numerically using a step size of 1 and 0.2 kbar, respectively. The obtained value of the shear modulus is 997.1 kbar, which is three times as large as the experimental value of 349 kbar reported in [9] and twice as large as compared to the roomtemperature value (439 kbar) found for Pr 0.48 Ca 0.52 MnO 3 [35]. Note that the moduli are calculated from the elastic constants using Hill's definition [30].…”

Section: Equation Of State From Simulations: Results For Stoichiometrmentioning

confidence: 67%

Equation of state of CaMnO3: a combined experimental and computational study

et al. 2013

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Section: Equation Of State From Simulations: Results For Stoichiometrmentioning

confidence: 67%

Equation of state of CaMnO3: a combined experimental and computational study

et al. 2013

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“…At some lower temperature the twin walls become pinned by defects in a freezing interval which is readily identifiable by the development of a Debye peak in the loss and an increase in stiffness with respect to shear, as appears to occur at T B . The loss peak can be fit according to [32] ( ) ( )…”

Section: Relaxation Processesmentioning

confidence: 99%

Strain behavior and lattice dynamics in Ni₅₀Mn₃₅In₁₅

Mejía

Nayak

Schiemer

et al. 2015

J. Phys.: Condens. Matter

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“…The likely pattern of Q −1 and G variations is illustrated in Fig. 5 for a well characterized loss peak in the perovskite Pr 0.48 Ca 0.52 MnO 3 (Carpenter et al . 2010d).…”

Section: Anelasticity Mapsmentioning

confidence: 99%

Anelasticity maps for acoustic dissipation associated with phase transitions in minerals

Carpenter¹,

Zhang²

2011

Geophysical Journal International

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S U M M A R YAcoustic dissipation due to structural phase transitions in minerals could give rise to large seismic attenuation effects superimposed on the high temperature background contribution from dislocations and grain boundaries in the Earth. In addition to the possibility of a sharp peak actually at a transition point for both compressional and shear waves, significant attenuation might arise over wider temperature intervals due to the mobility of transformation twins or other defects associated with the transition. Attenuation due to structural phase transitions in quartz, pyroxenes, perovskites, stishovite and hollandite, or to spin state transitions of Fe 2+ in magnesiowüstite and perovskite and the hcp/bcc transition in iron-nickel (Fe-Ni) alloy, are reviewed from this perspective. To these can be added possible loss behaviour associated with reconstructive transitions which might occur by a ledge mechanism on topotactic interfaces (orthopyroxene/clinopyroxene, olivine/spinel and perovskite/postperovskite), with impurities (Snoek effect) or with mobility of protons. There are experimental difficulties associated with measuring dissipation effects in situ at simultaneous high pressures and temperatures, so reliance is currently placed on investigation of analogue phases such as LaCoO 3 for spinstate behaviour and LaAlO 3 for the dynamics of ferroelastic twin walls. Similarly, it is not possible to measure loss dynamics simultaneously at the low stresses and low frequencies that pertain in seismic waves, so reliance must be placed on combining different techniques, such as dynamic mechanical analysis (low frequency, relatively high stress) and resonant ultrasound spectroscopy (high frequency, low stress), to extrapolate acoustic loss behaviour over wide frequency, temperature and stress intervals. In this context 'anelasticity maps' provide a convenient means of representing different loss mechanisms. Contouring of the inverse mechanical quality factor, Q −1 , can be achieved if the appropriate constitutive laws are known. The overall approach is illustrated using the examples of spin-state transitions of Co 3+ in LaCoO 3 and twin mobility in single crystals of the rhombohedral phase of LaAlO 3 . Anelasticity maps of this type should give seismologists a clearer view of the characteristic patterns of seismic velocity and attenuation that could be used to detect (or rule out) the presence of particular phase transitions or loss behaviour in the core and mantle.

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Elastic and anelastic relaxations associated with the incommensurate structure ofPr0.48Ca0.52MnO3

Cited by 32 publications

References 122 publications

Equation of state of CaMnO3: a combined experimental and computational study

Equation of state of CaMnO3: a combined experimental and computational study

Strain behavior and lattice dynamics in Ni₅₀Mn₃₅In₁₅

Anelasticity maps for acoustic dissipation associated with phase transitions in minerals

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Elastic and anelastic relaxations associated with the incommensurate structure ofPr0.48Ca0.52MnO3

Cited by 32 publications

References 122 publications

Equation of state of CaMnO3: a combined experimental and computational study

Equation of state of CaMnO3: a combined experimental and computational study

Strain behavior and lattice dynamics in Ni50Mn35In15

Anelasticity maps for acoustic dissipation associated with phase transitions in minerals

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Strain behavior and lattice dynamics in Ni₅₀Mn₃₅In₁₅