Magnetic properties, thermodynamic functions and Schottky contributions to the heat capacity of terbium, dysprosium, holmium, ytterbium titanates
Bissengaliyeva M.R. Bespyatov M.A. Gogol D.B. Taimassova S.T. Sadyrbekov D.T.
5 November 2025Elsevier Ltd
Journal of Alloys and Compounds
2025#1044
By the solid-phase method, the samples of lanthanide titanates (with the general formula Ln2Ti2O7, where Ln = Tb, Dy, Ho, Yb) were synthesized, and their structure by microprobe, X-ray phase and X-ray diffraction analysis were determined. By adiabatic calorimetry the dependence of the heat capacity of samples in the helium and nitrogen temperature ranges (4–320 K) were studied, and the anomalies caused by the structural features of the compounds were registered. From the total heat capacity of compounds, the phonon contribution and excess components corresponding to the Schottky anomaly were isolated, and energy parameters of the Stark levels splitting of the lanthanide ions in crystalline electric field of the compounds were calculated. The magnetic properties of the samples (magnetic susceptibility and effective magnetic moment) were studied in a range from 2 up to 300 K at the fields from 0 to 10 kOe. The research resulted in obtaining new data on the thermodynamic and physical properties of the samples obtained, which are applicable in materials science, chemistry, and solid state physics, electronics and other related industries. The standard values of the thermodynamic functions of the compounds are: Cp(298)= 219.3 ± 1.3 J/mol·K, S(298)= 275.6 ± 2.8 J/mol·K, HT−H0(298)= 38.37 ± 0.28 kJ/mol for terbium titanate; Cp(298)= 226.3 ± 1.4 J/mol·K, S(298)= 266.9 ± 2.8 J/mol·K, HT−H0(298)= 39.54 ± 0.30 kJ/mol for dysprosium titanate; Cp(298)= 223.7 ± 1.8 J/mol·K, S(298)= 271.9 ± 2.9 J/mol·K, HT−H0(298)= 39.69 ± 0.35 kJ/mol for holmium titanate; Cp(298)= 224.8 ± 1.2 J/mol·K, S(298)= 244.7 ± 2.0 J/mol·K, HT−H0(298)= 37.78 ± 0.26 kJ/mol for ytterbium titanate.
Adiabatic calorimetry , Heat capacity , Magnetic properties , Rare earth titanates , Schottky anomaly , Thermodynamic functions
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Chemistry Department, Buketov Karaganda University, 28 Universitetskaya Street, Karaganda, 100026, Kazakhstan
Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Academician Lavrentiev Avenue, Novosibirsk, 630090, Russian Federation
Institute of Problems of Complex Development of Mineral Resources, 5 Ippodromnaya Street, Karaganda, 100019, Kazakhstan
Chemistry Department
Nikolaev Institute of Inorganic Chemistry
Institute of Problems of Complex Development of Mineral Resources
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