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Mochel, J.M. Hempstead, Robert Douglas 2011-07-28T16:16:29Z 2011-07-28T16:16:29Z 10000-01-01 1970 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. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-28T16:16:29Z No. of bitstreams: 1 1970_hempstead.pdf: 2710459 bytes, checksum: cd61584cf0baddc03fff72091932be96 (MD5) Made available in DSpace on 2011-07-28T16:16:29Z (GMT). No. of bitstreams: 1 1970_hempstead.pdf: 2710459 bytes, checksum: cd61584cf0baddc03fff72091932be96 (MD5) Previous issue date: 1970 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-28T16:16:29Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:33:21-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 6053223 http://hdl.handle.net/2142/25866 en 1970 Robert Douglas Hempstead heat capacity manganese dibromide tetrahydrate Neel temperature Heat capacity measurements on manganese dibromide tetrahydrate near its Neel temperature Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.