Low-temperature heat capacity and thermodynamic functions of dysprosium selenide Dy2Se3

Low-temperature heat capacity and thermodynamic functions of dysprosium selenide Dy2Se3 Full article

Journal

Thermochimica Acta
ISSN: 1872-762X , E-ISSN: 0040-6031

Output data

Year: 2020, Volume: 686, Article number : 178551, Pages count : 5 DOI: 10.1016/j.tca.2020.178551

Tags

Heat capacity Thermodynamic functions Dysprosium selenide Schottky anomaly

Authors

Bespyatov M.A. ¹ , Musikhin A.E. ¹ , Zelenina L.N. ¹ , Chusova T.P. ¹ , Nikolaev R.E. ¹ , Korolkov I.V. ¹

Affiliations

1	Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences

A sample of dysprosium selenide (Dy2Se3) was synthesized and characterized by various physicochemical methods. The heat capacity of Dy2Se3 has been measured in the temperature range from T=4.85 K to T=301.11 K using adiabatic calorimetry. Two pronounced λ-anomalies with maxima at temperatures TC1=6.20 K and TC2=219.40 K were found in the functional behavior of the heat capacity. In addition, the heat capacity of Dy2Se3(cr) showed a continuing excess value consistent with a Schottky anomaly on energy levels lying roughly from 0 to 425 cm−1 above the ground state. On the basis of experimental data on the heat capacity, the values of entropy, enthalpy and reduced Gibbs energy were calculated in the interval from T=0 to T=301 K, and the anomalous contribution to these properties was determined. The value of the absolute entropy obtained was used for calculation of Dy2Se3(cr) entropy formation at T=298.15 K.

Bespyatov M.A. , Musikhin A.E. , Zelenina L.N. , Chusova T.P. , Nikolaev R.E. , Korolkov I.V.
Low-temperature heat capacity and thermodynamic functions of dysprosium selenide Dy2Se3
Thermochimica Acta. 2020. V.686. 178551 :1-5. DOI: 10.1016/j.tca.2020.178551 WOS OpenAlex

Submitted:	Oct 30, 2019
Accepted:	Feb 7, 2020
Published online:	Feb 19, 2020

Web of science:	WOS:000528017000017
OpenAlex:	W3007469216

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OpenAlex	2