A new pressure medium, Daphne 7676, with solidification pressure of 5 GPa at 300 K and low melting point of around 110 K at ambient pressure

K. Murata; K. Goto; S. Klotz; D. Bhoi; K. Béneut; Y. Uwatoko; H. Yoshino; S. Aoki

doi:10.1080/08957959.2025.2506417

A new pressure medium, Daphne 7676, with solidification pressure of 5 GPa at 300 K and low melting point of around 110 K at ambient pressure

K. Murata
, K. Goto
, S. Klotz
, D. Bhoi
, K. Béneut
, Y. Uwatoko
, H. Yoshino
, S. Aoki

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

2 Scopus citations

Abstract

A recently developed pressure medium ‘Daphne 7676’ increases considerably the solidification pressure (P_s) at room temperature from 3.7 GPa (Daphne 7474) and 4.0 GPa (Daphne 7575) to 5 GPa. Moreover, Daphne 7676 is found to show a viscosity more than one order of magnitude lower than the preceding materials. Even after solidified above 5 GPa, the medium appears to have exceptionally low shear strength, with evidence of some relaxations over time-scales of hours. Furthermore, at ambient pressure, Daphne 7676 is found to show freezing/melting temperature (T_m) of 113 K and a glass transition (T_g) at approximately 110 K. These values are considerably lower than for Daphne 7474, with T_m = 150 K and T_g = 140 K. Considering that 113 K is close to the critical temperature T_c (110 K) of Bi-high-T_c superconductors, for example, this fluid may have widespread applications in high pressure research but potentially also in bio and life-sciences.

Original language	English
Pages (from-to)	151-161
Number of pages	11
Journal	High Pressure Research
Volume	45
Issue number	2
DOIs	https://doi.org/10.1080/08957959.2025.2506417
State	Published - 2025
Externally published	Yes

Funding

The authors appreciate Idemitsu Kosan Co. Ltd for the long-term support for developing high pressure medium. Part of this work was carried out at ISSP/Univ. of Tokyo and at Sorbonne Université, IMPMC, Paris, France. S.K. would like to acknowledge financial support from the CNRS French High Pressure Network ‘(Réseau Hautes Pressions)’. The authors appreciate very much the assistance of Y. Guarnelli in the preparation of the DAC measurements. K.M. would like to express special thanks to French high pressure network (https://reseauhp.org/), which provided us marvelous opportunities for solving some crucial problems of this work.

Keywords

Daphne
High pressure
pressure transmitting fluid
ultra-low melting point
ultra-low viscosity fluid

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10.1080/08957959.2025.2506417

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title = "A new pressure medium, Daphne 7676, with solidification pressure of 5 GPa at 300 K and low melting point of around 110 K at ambient pressure",

abstract = "A recently developed pressure medium {\textquoteleft}Daphne 7676{\textquoteright} increases considerably the solidification pressure (Ps) at room temperature from 3.7 GPa (Daphne 7474) and 4.0 GPa (Daphne 7575) to 5 GPa. Moreover, Daphne 7676 is found to show a viscosity more than one order of magnitude lower than the preceding materials. Even after solidified above 5 GPa, the medium appears to have exceptionally low shear strength, with evidence of some relaxations over time-scales of hours. Furthermore, at ambient pressure, Daphne 7676 is found to show freezing/melting temperature (Tm) of 113 K and a glass transition (Tg) at approximately 110 K. These values are considerably lower than for Daphne 7474, with Tm = 150 K and Tg = 140 K. Considering that 113 K is close to the critical temperature Tc (110 K) of Bi-high-Tc superconductors, for example, this fluid may have widespread applications in high pressure research but potentially also in bio and life-sciences.",

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author = "K. Murata and K. Goto and S. Klotz and D. Bhoi and K. B{\'e}neut and Y. Uwatoko and H. Yoshino and S. Aoki",

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T1 - A new pressure medium, Daphne 7676, with solidification pressure of 5 GPa at 300 K and low melting point of around 110 K at ambient pressure

AU - Murata, K.

AU - Goto, K.

AU - Klotz, S.

AU - Bhoi, D.

AU - Béneut, K.

AU - Uwatoko, Y.

AU - Yoshino, H.

AU - Aoki, S.

PY - 2025

Y1 - 2025

N2 - A recently developed pressure medium ‘Daphne 7676’ increases considerably the solidification pressure (Ps) at room temperature from 3.7 GPa (Daphne 7474) and 4.0 GPa (Daphne 7575) to 5 GPa. Moreover, Daphne 7676 is found to show a viscosity more than one order of magnitude lower than the preceding materials. Even after solidified above 5 GPa, the medium appears to have exceptionally low shear strength, with evidence of some relaxations over time-scales of hours. Furthermore, at ambient pressure, Daphne 7676 is found to show freezing/melting temperature (Tm) of 113 K and a glass transition (Tg) at approximately 110 K. These values are considerably lower than for Daphne 7474, with Tm = 150 K and Tg = 140 K. Considering that 113 K is close to the critical temperature Tc (110 K) of Bi-high-Tc superconductors, for example, this fluid may have widespread applications in high pressure research but potentially also in bio and life-sciences.

AB - A recently developed pressure medium ‘Daphne 7676’ increases considerably the solidification pressure (Ps) at room temperature from 3.7 GPa (Daphne 7474) and 4.0 GPa (Daphne 7575) to 5 GPa. Moreover, Daphne 7676 is found to show a viscosity more than one order of magnitude lower than the preceding materials. Even after solidified above 5 GPa, the medium appears to have exceptionally low shear strength, with evidence of some relaxations over time-scales of hours. Furthermore, at ambient pressure, Daphne 7676 is found to show freezing/melting temperature (Tm) of 113 K and a glass transition (Tg) at approximately 110 K. These values are considerably lower than for Daphne 7474, with Tm = 150 K and Tg = 140 K. Considering that 113 K is close to the critical temperature Tc (110 K) of Bi-high-Tc superconductors, for example, this fluid may have widespread applications in high pressure research but potentially also in bio and life-sciences.

KW - Daphne

KW - High pressure

KW - pressure transmitting fluid

KW - ultra-low melting point

KW - ultra-low viscosity fluid

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DO - 10.1080/08957959.2025.2506417

M3 - Article

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SN - 0895-7959

VL - 45

SP - 151

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JO - High Pressure Research

JF - High Pressure Research

IS - 2

ER -

A new pressure medium, Daphne 7676, with solidification pressure of 5 GPa at 300 K and low melting point of around 110 K at ambient pressure

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