Kinetics and systematics of structural phase transitions in the regular lanthanide metals under pressure

Krüger, Thomas; Merkau, B.; Grosshans, W.A.; Holzapfel, W. B.

doi:10.1080/08957959008203173

Cited by 57 publications

(43 citation statements)

References 58 publications

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“…In all of our samples we observed the bcc-hcp transition in agreement with previous studies [2][3][4][5][6][7], and Eu transformed to the incommensurately modulated i-mC4 structure at 31.5 GPa. Preliminary studies performed on station ID09a found that although the i-mC4 structure gives an excellent fit to the diffraction profiles collected in the 31.5-38 GPa region, it could not explain the patterns collected at higher pressures.…”

Section: A Transition To Eu-vsupporting

confidence: 80%

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Incommensurate-to-incommensurate phase transition in Eu metal at high pressures

et al. 2014

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High pressure x-ray powder-diffraction experiments were performed on europium metal up to ∼70 GPa. Above 38 GPa, europium transforms from the incommensurately modulated Eu-IV phase to a second phase with an incommensurately modulated crystal structure, Eu-V. This is a previously unseen incommensurately modulated to incommensurately modulated transition in the elements at high pressure. High-pressure high-temperature experiments were also performed up to 449 K in order to make an initial estimate of the positions of the phase boundaries of the incommensurate phases.

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Section: A Transition To Eu-vsupporting

confidence: 80%

“…Initial high-pressure x-ray diffraction studies [2][3][4][5] reported a transition to a new phase Eu-III above 17 GPa. This was identified by the appearance of a number of weak reflections in the diffraction pattern in addition to those from the hcp phase.…”

Section: Introductionmentioning

confidence: 99%

Incommensurate-to-incommensurate phase transition in Eu metal at high pressures

et al. 2014

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“…Upon further application of pressure above 4 GPa, α-Ce transforms to α ′ -Ce, which has the same structure as α-U, 12 and T c jumps from 50 mK to 1.9 K. 13,14 Pr, 15 Gd, 16,17 Tb, 18 Dy, 19 and Ho 20 metals also exhibit volume collapse transitions under pressure, although cerium is the only case where the transition is isostructural. These phases are believed to derive from the increased participation of the 4f -electrons in bonding [21][22][23] and result in low symmetry crystal structures that are similar or identical to those of the light actinide elements in which the 5f -electrons are thought to be itinerant. The behavior of volume collapse transitions in rare earth metals has been interpreted in terms of either a Mott metallization of the f -states (Hubbard model) or Kondo screening of the f magnetic moment (periodic Anderson model), although it now appears that the two models may be closely related.…”

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confidence: 99%

Low-temperature electrical resistivity of praseodymium at pressures up to 120 GPa

et al. 2011

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“…However, there were severe time restrictions associated with such advances. For example, the technique discussed in Kruger's work 31 suggests that the "rapid" time steps of these experiments were of the order of 2-3 min. While no one would debate the rapidity of such measurements at the time, there are many transformations that are far too short to be probed at this time scale.…”

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confidence: 99%

Pressure-induced kinetics of the α to ω transition in zirconium

Jacobsen

Velisavljevic

Sinogeikin

2015

Journal of Applied Physics

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Diamond anvil cells (DAC) coupled with x-ray diffraction (XRD) measurements are one of the primary techniques for investigating structural stability of materials at high pressure-temperature (P-T) conditions. DAC-XRD has been predominantly used to resolve structural information at set P-T conditions and, consequently, provides P-T phase diagram information on a broad range of materials. With advances in large scale synchrotron x-ray facilities and corresponding x-ray diagnostic capabilities, it is now becoming possible to perform sub-second time resolved measurements on micron sized DAC samples. As a result, there is an opportunity to gain valuable information about the kinetics of structural phase transformations and extend our understanding of material behavior at high P-T conditions. Using DAC-XRD time resolved measurements, we have investigated the kinetics of the α to ω transformation in zirconium. We observe a clear time and pressure dependence in the martensitic α-ω transition as a function of pressure-jump, i.e., drive pressure. The resulting data are fit using available kinetics models, which can provide further insight into transformation mechanism that influence transformation kinetics. Our results help shed light on the discrepancies observed in previous measurements of the α-ω transition pressure in zirconium.

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Kinetics and systematics of structural phase transitions in the regular lanthanide metals under pressure

Cited by 57 publications

References 58 publications

Incommensurate-to-incommensurate phase transition in Eu metal at high pressures

Incommensurate-to-incommensurate phase transition in Eu metal at high pressures

Low-temperature electrical resistivity of praseodymium at pressures up to 120 GPa

Pressure-induced kinetics of the α to ω transition in zirconium

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