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Investigations of the Temperature Gradients Affecting the Temperature Scale of a 3ω-Heat Capacity Spectrometer by Ulf G. Jonsson; Ove Andersson; Åke Fransson is a Materials Science article available to read on EtoBox.

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The temperature gradients affecting the temperature scale of a dynamic heat capacity spectrometer based on the 3o-method are investigated using the SmecticA-Nematic (SmA/N) transition in the liquid crystal octyloxycyanobiphenyl (8OCB). The heater (sample) temperature was obtained from a thermocouple by superimposing the temperature increase of the heater, where the increase was calculated from the heater power. The calibration using the SmA/N transition yields a linear relation between the temperature rise of the heater DT h and the heater power P: DT h 55.2P. An estimation of the maximum temperature gradient in the 8OCB sample shows that the correction of the sample temperature due to the gradient is small compared to DT h (<À0.01 K for o3.98. 2p rads À1 and À0.14 K for o0.01. 2p rads À1 ). For high heating powers there is a signi®cant temperature gradient in the heater, which causes a broadening of the SmA/N peakwidth from 0.5 K for P7.7 mW to 2 K for P29.4 mW.

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Author

Ulf G. Jonsson; Ove Andersson; Åke Fransson

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0040-6031)

Published

2000

Language

EN

Field

Materials Science (Physical Sciences)