Abstract
Need and relevance is shown for precise specific heat measurements of existing and novel synthesized substances and solid materials at low temperatures. Construction, operation principle and the results of metrological investigation are presented for the State primary special Standard of the unit of specifi c heat of solids GET 79-2020. GET 79-2020 is equipped with new improved basic throttle cryostat and cell for heat capacitance measurements providing faster and efficient cooling of measured samples and suppression of parasitic heat fluxes. The ranges of reproduction of the unit of specific heat of solids in GET 79-2020 is 0,03–718 J/(kg·К), and the temperature range is 2–300 K. Method of heat capacitance measurements is described with application of developed cell. Metrological characteristics of GET 79-2020 are investigated. An uncertainty budget is calculated for reproduction of the unit of specific heat. The obtained results significantly expand the temperature range of measurements and the park of working standards for heat capacity measuring instruments verified at GET 79-2020.
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