Abstract
Estimates for the pressure required to produce metallic hydrogen from the normal molecular state vary from a minimum of 0.25 Mbar [1] to well over 20 Mbar [2]. A pressure in the range 0.75 to 2 Mbar [3–5] is currently accepted. Although this is within the range of pressures produced with transient pressure techniques, the corresponding temperature rise is high (see Fig. 1). Even with the relatively slow magnetic implosion technique of Hawke [6], temperatures in excess of 2000 K are probably reached in compressing molecular hydrogen to 1 Mbar. Such a technique would probably produce liquid metallic hydrogen, particularly since the melting temperature may be estimated from the Lindemann melting formula to be approximately 1000 K. (This calculation assumes that the Lindemann constant for metallic hydrogen is the same as that for Li and Na.)
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Spain, I.L., Ishizaki, K., Marchello, J.M., Paauwe, J. (1973). Prospects for Obtaining Metallic Hydrogen with Spherical Presses. In: Timmerhaus, K.D. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 18. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3111-7_53
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DOI: https://doi.org/10.1007/978-1-4684-3111-7_53
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