Melting curve of potassium to 22 GPa

O.  Narygina; E. E. McBride; G. W.  Stinton; M. I. McMahon

doi:10.1103/physrevb.84.054111

Melting curve of potassium to 22 GPa

O. Narygina^*, E. E. McBride, G. W. Stinton, M. I. McMahon

^*Corresponding author for this work

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

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Abstract

The melting curve of potassium has been measured experimentally to 22 GPa using in situ X-ray diffraction and gas-membrane diamond anvil cells equipped with external resistive heating. The evolution of the melting temperature with pressure is similar to that of sodium, but it is different to that reported previously. A melting maximum is found in the stability field of the bcc-phase, at 5.8(5) GPa, followed by a decrease in the melting temperature down to a melting minimum at the fcc-host-guest (𝑡𝐼19) transition at 19(1) GPa. The bcc-fcc-liquid and fcc-𝑡𝐼19-liquid triple points are found to be at 466(10) K and 13.6(3) GPa and at 390(10) K and 19.0(3) GPa, respectively.

Original language	English
Article number	054111
Number of pages	7
Journal	Physical Review B
Volume	84
Issue number	5
DOIs	https://doi.org/10.1103/physrevb.84.054111
Publication status	Published - 12 Aug 2011
Externally published	Yes

Keywords

melting curve
potassium
22 GPa

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title = "Melting curve of potassium to 22 GPa",

abstract = "The melting curve of potassium has been measured experimentally to 22 GPa using in situ X-ray diffraction and gas-membrane diamond anvil cells equipped with external resistive heating. The evolution of the melting temperature with pressure is similar to that of sodium, but it is different to that reported previously. A melting maximum is found in the stability field of the bcc-phase, at 5.8(5) GPa, followed by a decrease in the melting temperature down to a melting minimum at the fcc-host-guest (𝑡𝐼19) transition at 19(1) GPa. The bcc-fcc-liquid and fcc-𝑡𝐼19-liquid triple points are found to be at 466(10) K and 13.6(3) GPa and at 390(10) K and 19.0(3) GPa, respectively.",

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author = "O. Narygina and McBride, {E. E.} and Stinton, {G. W.} and McMahon, {M. I.}",

year = "2011",

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doi = "10.1103/physrevb.84.054111",

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T1 - Melting curve of potassium to 22 GPa

AU - Narygina, O.

AU - McBride, E. E.

AU - Stinton, G. W.

AU - McMahon, M. I.

PY - 2011/8/12

Y1 - 2011/8/12

N2 - The melting curve of potassium has been measured experimentally to 22 GPa using in situ X-ray diffraction and gas-membrane diamond anvil cells equipped with external resistive heating. The evolution of the melting temperature with pressure is similar to that of sodium, but it is different to that reported previously. A melting maximum is found in the stability field of the bcc-phase, at 5.8(5) GPa, followed by a decrease in the melting temperature down to a melting minimum at the fcc-host-guest (𝑡𝐼19) transition at 19(1) GPa. The bcc-fcc-liquid and fcc-𝑡𝐼19-liquid triple points are found to be at 466(10) K and 13.6(3) GPa and at 390(10) K and 19.0(3) GPa, respectively.

AB - The melting curve of potassium has been measured experimentally to 22 GPa using in situ X-ray diffraction and gas-membrane diamond anvil cells equipped with external resistive heating. The evolution of the melting temperature with pressure is similar to that of sodium, but it is different to that reported previously. A melting maximum is found in the stability field of the bcc-phase, at 5.8(5) GPa, followed by a decrease in the melting temperature down to a melting minimum at the fcc-host-guest (𝑡𝐼19) transition at 19(1) GPa. The bcc-fcc-liquid and fcc-𝑡𝐼19-liquid triple points are found to be at 466(10) K and 13.6(3) GPa and at 390(10) K and 19.0(3) GPa, respectively.

KW - melting curve

KW - potassium

KW - 22 GPa

U2 - 10.1103/physrevb.84.054111

DO - 10.1103/physrevb.84.054111

M3 - Article

SN - 2469-9969

VL - 84

JO - Physical Review B

JF - Physical Review B

IS - 5

M1 - 054111

ER -

Melting curve of potassium to 22 GPa

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Keywords

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