TY - JOUR

T1 - Thermodynamic Properties and Vaporization Processes in the La2C3–C System

AU - Ворожцов, Виктор Алексеевич

AU - Столярова, Валентина Леонидовна

AU - Лопатин, Сергей Игоревич

AU - Сильников, Никита Михайлович

AU - Арлашкин, Илья Евгеньевич

AU - Шилов, Андрей Леонидович

AU - Альмяшев, Вячеслав Исхакович

N1 - Vorozhtcov V.A., Stolyarova V.L., Lopatin S.I., Silnikov N.M., Arlashkin I.E., Shilov A.L., Almjashev V.I. Thermodynamic properties and vaporization processes in the La2C3-C system. // Russian Journal of Inorganic Chemistry. 2026. V. 71. N 9. P. 1349–1357. doi: 10.1134/S003602362660190X

PY - 2026/8/30

Y1 - 2026/8/30

N2 - Abstract: Vaporization processes of the components in the La2C3–C system were studied by Knudsen effusion mass spectrometry in the temperature range of 2196–2435 K. The main vapor species over the system under study were La and LaC2. The temperature dependences of the partial pressures of the identified vapor species and of the La activity, as well as the La and LaC2 partial molar enthalpies of vaporization, were determined in the La2C3–C system. It was shown that the found values of thermodynamic properties are in agreement with the literature data and with the results of modeling using the NUCLEA database for the LaC2–C system. This allowed the thermodynamic properties of the LaC2–C system to be evaluated on the basis of the obtained values. It was established that the La activity is independent of temperature, indicating a zero La partial molar enthalpy of mixing in the region of the LaC2 and C equilibrium. The results of this study can be further used to supplement thermodynamic databases and to optimize phase diagrams of multicomponent carbide systems that are promising for various high-temperature technologies.

AB - Abstract: Vaporization processes of the components in the La2C3–C system were studied by Knudsen effusion mass spectrometry in the temperature range of 2196–2435 K. The main vapor species over the system under study were La and LaC2. The temperature dependences of the partial pressures of the identified vapor species and of the La activity, as well as the La and LaC2 partial molar enthalpies of vaporization, were determined in the La2C3–C system. It was shown that the found values of thermodynamic properties are in agreement with the literature data and with the results of modeling using the NUCLEA database for the LaC2–C system. This allowed the thermodynamic properties of the LaC2–C system to be evaluated on the basis of the obtained values. It was established that the La activity is independent of temperature, indicating a zero La partial molar enthalpy of mixing in the region of the LaC2 and C equilibrium. The results of this study can be further used to supplement thermodynamic databases and to optimize phase diagrams of multicomponent carbide systems that are promising for various high-temperature technologies.

KW - Knudsen effusion mass spectrometry

KW - carbide ceramics

KW - lanthanum carbide

KW - partial pressure

KW - lanthanum activity

UR - https://www.mendeley.com/catalogue/2f8f51e0-8063-3c20-be7c-ef6bd2d8633e/

U2 - 10.1134/S003602362660190X

DO - 10.1134/S003602362660190X

M3 - Article

VL - 71

SP - 1349

EP - 1357

JO - Russian Journal of Inorganic Chemistry

JF - Russian Journal of Inorganic Chemistry

SN - 0036-0236

IS - 9

ER -