University of Illinois Urbana-Champaign

Heat capacities of three magnetic salts near their critical points

Rayl, Martin

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https://hdl.handle.net/2142/25068

Description

Title
Heat capacities of three magnetic salts near their critical points
Author(s)
Rayl, Martin
Issue Date
1966
Doctoral Committee Chair(s)
Wheatley, J.C.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • low temperature heat capacity
  • magnetic salts
  • critical point
  • magnetic entropy
Language
en
Abstract
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.
Type of Resource
text
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http://hdl.handle.net/2142/25068
Copyright and License Information
1966 Martin Rayl

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