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Melting and phase transitions of RbCl to 10 kilobars
Author(s) -
Morse S. A.,
Yoder H. S.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl03392
Subject(s) - liquidus , triple point , differential thermal analysis , thermodynamics , analytical chemistry (journal) , melting point , phase diagram , phase (matter) , phase transition , calibration , chemistry , mineralogy , materials science , physics , chromatography , optics , organic chemistry , quantum mechanics , diffraction
Melting determinations on spectrographic grade RbCl by differential thermal analysis in an internally‐heated, gas‐media apparatus gave the following constants for the Simon equation, P − P o = A[( T / T o ) c −1] (bars, Kelvin). For RbCl I =L, P o = 1, T o = 993.45, A = 8122, c = 5.02, sd = 0.5 K. For RbCl II = L, P o = 7750, T o = 1131.15, A = 5061, c = 6.40, sd = 1.0 K. The solid‐solid transition RbCl I=II determined by DTA is described by P = 4490 + T /0.35. The best‐fit triple point lies on a liquidus cusp at 1134 K, 7790 b. The results for melting are 3–7 K higher than earlier results. The new determinations are useful in the calibration of experimental apparatus at moderate pressure. They confirm that temperature calibration cannot explain divergent liquidus determinations for the system Ab‐H 2 O.