Heat Capacity and Thermodynamic Characteristics of Sodium and Potassium Nickelite-Manganites of Neodymium of NdNa<sub>2</sub>NiMnO<sub>5</sub> and NdK<sub>2</sub>NiMnO<sub>5</sub>

Heat Capacity and Thermodynamic Characteristics of Sodium and Potassium Nickelite-Manganites of Neodymium of NdNa<sub>2</sub>NiMnO<sub>5</sub> and NdK<sub>2</sub>NiMnO<sub>5</sub>

For the first time, neodymium nickel manganites NdNa<sub>2</sub>NiMnO<sub>5</sub> and NdK<sub>2</sub>NiMnO<sub>5</sub> were synthesized via the solid-state interaction method, and they crystallize in a cubic system. Using experimental dynamic calorimet...

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Main Authors: Shuga Bulatovna Kasenova, Zhenisgul Imangalievna Sagintaeva, Bulat Kunurovich Kasenov, Erbolat Ermekovich Kuanyshbekov, Aigul Tanirbergenovna Ordabaeva, Manara Amangeldievna Isabaeva
Format: Article
Language:English
Published: MDPI AG 2025-06-01
Series:Applied Sciences
Subjects:
neodymium
manganite
heat capacity
phase transition
thermodynamic functions
electrophysics
Online Access:https://www.mdpi.com/2076-3417/15/12/6751
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Summary:For the first time, neodymium nickel manganites NdNa<sub>2</sub>NiMnO<sub>5</sub> and NdK<sub>2</sub>NiMnO<sub>5</sub> were synthesized via the solid-state interaction method, and they crystallize in a cubic system. Using experimental dynamic calorimetry in the temperature range of 298.15–673 K, the temperature dependences of the heat capacity of NdNa<sub>2</sub>NiMnO<sub>5</sub> and NdK<sub>2</sub>NiMnO<sub>5</sub> were studied. At 423 K, both compounds exhibited anomalous heat capacity jumps on the C<sup>0</sup><sub>p</sub>~f(T) dependency, likely corresponding to second-order phase transitions. Considering the phase transition temperatures, equations for the temperature dependence of heat capacity were derived, accurately describing the experimental data. Based on the experimental C<sup>0</sup><sub>p</sub>(T) data and calculated S<sup>0</sup> (298.15) values, temperature dependences of C<sup>0</sup><sub>p</sub>(T) and the thermodynamic functions S<sup>0</sup>(T), H°(T)–H<sup>0</sup>(298.15), and Φ<sup>xx</sup>(T) were determined for the studied compounds within the 298.15–673 K range. The analysis of electrophysical data confirmed the semiconducting and metallic nature of the conductivity, as well as identified the band gap and activation energy of conductivity. These results are valuable for the application of these materials in electronics and for controlling conductivity.
ISSN:2076-3417

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