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Wheatley, J.C. Rayl, Martin 2011-05-31T16:16:23Z 2011-05-31T16:16:23Z 10000-01-01 1966 Low temperature heat capacity measurements have been made near the . 6H20. A method of determining the critical point TA from a welldefined physical event has been found. For Mn(NH4)2(S04)2 . 6H20, TA = 0.1763°K, the width of the transition is known to +2 ~oK, and data have been obtained to T-T -4 A = +10 TA. The precision in the differences, T-T A , is a few microdegrees near Td A structured peak 5 mOK in width has been found in the heat capacity of K3Fe(CN)6 at about 0.130 oK. TA could not be defined uniquely for this salt. For CuK2(S04)2 . 6H20, TA = 0.0295°K, the width of the transition -2 is known to ±0.2 mOK, and data have been obtained to T-TA = ±3 x 10 TA The magnetic entropy has been found for the latter two salts. The results of these measurements are compared with the work of others on magnetic phase transitions and liquid-vapor phase transitions. Agreement with existing theories is discussed. These results will be published by the author, 0. E. Vilches, and J. C. Wheatley. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-31T16:16:23Z No. of bitstreams: 1 1966_rayl.pdf: 2894674 bytes, checksum: 28a29d07c2cde46efeb192c158920fbd (MD5) Made available in DSpace on 2011-05-31T16:16:23Z (GMT). No. of bitstreams: 1 1966_rayl.pdf: 2894674 bytes, checksum: 28a29d07c2cde46efeb192c158920fbd (MD5) Previous issue date: 1966 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-05-31T16:16:23Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:13:29-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 6117609 http://hdl.handle.net/2142/25068 en 1966 Martin Rayl low temperature heat capacity magnetic salts critical point magnetic entropy Heat capacities of three magnetic salts near their critical points Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.