Heat capacity measurements on manganese dibromide tetrahydrate near its Neel temperature
Hempstead, Robert Douglas
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https://hdl.handle.net/2142/25866
Description
Title
Heat capacity measurements on manganese dibromide tetrahydrate near its Neel temperature
Author(s)
Hempstead, Robert Douglas
Issue Date
1970
Doctoral Committee Chair(s)
Mochel, J.M.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
heat capacity
manganese dibromide tetrahydrate
Neel temperature
Language
en
Abstract
Heat capacity measurements on very small single crystals of manganese dibromide tetrahydrate have been made using the a.c. or oscillating temperature method. These measurements show rounding in a temperature range of about one millidegree at the Neel temperature (2.l2oK). Outside this region the data may be fit by a power law singularity, within the experimental error, with 0.01 < alpha < 0.21, -0.10 < alpha' < 0.10 and 2.ll88°K < TN < 2.1204°K. The errors in ~, ~', and TN were obtained from a chi squared test for 90% probability that the true values lie within these limits.
The heat capacity in the critical region of partially deuterated crystals with 1% deuterium was measured to obtain the effect of this impurity on the rounding. No effect was observed.
Comparison is made to the heat capacity measurements by Dixon and Rives on MnC12 .4H20, which is nearly isostructural to MnBr2·4H20.
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