Single-crystal studies of incommensurate Na to 1.5 Mbar

L. F. Lundegaard; E. Gregoryanz; M. I. McMahon; C. Guillaume; I. Loa; R. J. Nelmes; Malcolm McMahon

doi:10.1103/PhysRevB.79.064105

Single-crystal studies of incommensurate Na to 1.5 Mbar

L. F. Lundegaard, E. Gregoryanz, M. I. McMahon, C. Guillaume, I. Loa, R. J. Nelmes, Malcolm McMahon

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

Synchrotron single-crystal diffraction data show that sodium transforms from the oP8 structure to an incommensurate host-guest composite structure above 125 GPa in which the guest component is nearly "melted." At 147 GPa, the correlation length between the guest chains is only 28(3) A, or approximately six times the chain spacing. This configuration shows a wide range of stability from above 125 GPa to at least 155 GPa and 550 K. The transition to this phase is accompanied by a marked decrease in optical reflectivity. Electronic band-structure calculations are used to interpret this change.

Original language	English
Article number	064105
Pages (from-to)	-
Number of pages	5
Journal	Physical review B
Volume	79
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.79.064105
Publication status	Published - 9 Feb 2009

Keywords / Materials (for Non-textual outputs)

band structure
commensurate-incommensurate transformations
high-pressure solid-state phase transformations
sodium
HIGH-PRESSURE
PHASE-RELATIONS
LITHIUM
SUPERCONDUCTIVITY
SODIUM

Access to Document

10.1103/PhysRevB.79.064105

publisher final version
Publisher's Version/PDF: author can archive publisher's version/PDF
Final published version, 721 KB

http://prb.aps.org/abstract/PRB/v79/i6/e064105

Cite this

@article{cdf724676ad547ff8c065c9eaab6d805,

title = "Single-crystal studies of incommensurate Na to 1.5 Mbar",

abstract = "Synchrotron single-crystal diffraction data show that sodium transforms from the oP8 structure to an incommensurate host-guest composite structure above 125 GPa in which the guest component is nearly {"}melted.{"} At 147 GPa, the correlation length between the guest chains is only 28(3) A, or approximately six times the chain spacing. This configuration shows a wide range of stability from above 125 GPa to at least 155 GPa and 550 K. The transition to this phase is accompanied by a marked decrease in optical reflectivity. Electronic band-structure calculations are used to interpret this change.",

keywords = "band structure, commensurate-incommensurate transformations, high-pressure solid-state phase transformations, sodium, HIGH-PRESSURE, PHASE-RELATIONS, LITHIUM, SUPERCONDUCTIVITY, SODIUM",

author = "Lundegaard, {L. F.} and E. Gregoryanz and McMahon, {M. I.} and C. Guillaume and I. Loa and Nelmes, {R. J.} and Malcolm McMahon",

year = "2009",

month = feb,

day = "9",

doi = "10.1103/PhysRevB.79.064105",

language = "English",

volume = "79",

pages = "--",

journal = "Physical review B",

issn = "1098-0121",

publisher = "American Physical Society",

number = "6",

}

TY - JOUR

T1 - Single-crystal studies of incommensurate Na to 1.5 Mbar

AU - Lundegaard, L. F.

AU - Gregoryanz, E.

AU - McMahon, M. I.

AU - Guillaume, C.

AU - Loa, I.

AU - Nelmes, R. J.

AU - McMahon, Malcolm

PY - 2009/2/9

Y1 - 2009/2/9

N2 - Synchrotron single-crystal diffraction data show that sodium transforms from the oP8 structure to an incommensurate host-guest composite structure above 125 GPa in which the guest component is nearly "melted." At 147 GPa, the correlation length between the guest chains is only 28(3) A, or approximately six times the chain spacing. This configuration shows a wide range of stability from above 125 GPa to at least 155 GPa and 550 K. The transition to this phase is accompanied by a marked decrease in optical reflectivity. Electronic band-structure calculations are used to interpret this change.

AB - Synchrotron single-crystal diffraction data show that sodium transforms from the oP8 structure to an incommensurate host-guest composite structure above 125 GPa in which the guest component is nearly "melted." At 147 GPa, the correlation length between the guest chains is only 28(3) A, or approximately six times the chain spacing. This configuration shows a wide range of stability from above 125 GPa to at least 155 GPa and 550 K. The transition to this phase is accompanied by a marked decrease in optical reflectivity. Electronic band-structure calculations are used to interpret this change.

KW - band structure

KW - commensurate-incommensurate transformations

KW - high-pressure solid-state phase transformations

KW - sodium

KW - HIGH-PRESSURE

KW - PHASE-RELATIONS

KW - LITHIUM

KW - SUPERCONDUCTIVITY

KW - SODIUM

UR - http://www.scopus.com/inward/record.url?scp=61549117830&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.79.064105

DO - 10.1103/PhysRevB.79.064105

M3 - Article

SN - 1098-0121

VL - 79

SP - -

JO - Physical review B

JF - Physical review B

IS - 6

M1 - 064105

ER -

Single-crystal studies of incommensurate Na to 1.5 Mbar

Abstract / Description of output

Keywords / Materials (for Non-textual outputs)

Access to Document

Other files and links

Fingerprint

Lattice dynamical, electronic and structural properties of complex metals at extreme conditions. Advanced Fellowship

Cite this

Single-crystal studies of incommensurate Na to 1.5 Mbar

Abstract / Description of output

Keywords / Materials (for Non-textual outputs)

Access to Document

Other files and links

Fingerprint

Projects

Lattice dynamical, electronic and structural properties of complex metals at extreme conditions. Advanced Fellowship

Cite this