Title

Glassy carbon, NIST standard reference material (SRM 3600): Hydrogen content, neutron vibrational density of states and heat capacity

Document Type

Article

Publication Date

10-1-2018

Keywords

Glassy carbon, Graphite, Hydrogen content, Neutron vibrational density of states, Specific heat, Standard reference materials

Abstract

© 2018 International Union of Crystallography. Commercial glassy carbon plates being used as absolute intensity calibration standards in small-angle X-ray scattering applications (NIST SRM 3600) have been characterized in several recent publications. This contribution adds to the characterization by measuring the hydrogen content of a plate to be (4.8 ± 0.2) × 10−4(mol H)/(mol C), and by measuring the vibrational spectrum by neutron inelastic scattering. The spectrum bears a strong resemblance to published measurements on graphite, allowing the identification of several spectral features. The measured spectrum is used to calculate the heat capacity of low-hydrogen-content glassy carbon for comparison with measurements reported here from 20 to 295 K.

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