Venkata Trinadh Vinjavarapu, Bera Suranjan, Brahmananda Rao Cherukuri Venkata Siva
Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India.
Homi Bhabha National Institute, Mumbai, India.
Rapid Commun Mass Spectrom. 2024 Dec 15;38(23):e9914. doi: 10.1002/rcm.9914.
Vaporisation thermodynamic studies were performed over <ZrAl(cr) + ZrAl(cr) > and <ZrAl(cr) + ZrAl(cr) > biphasic region of Al-Zr system by employing Knudsen Effusion Mass Spectrometry (KEMS) in the temperature range between 1,233 to 1,535 and 1,208 to 1,458 K, respectively. It was observed that these samples undergo incongruent vaporisation with Al(g) alone in the vapour phase. Following are the recommended p-T relations deduced in the present study: log (p/Pa) = (-18,663 ± 132)/T + (12.23 ± 0.10) (1,233-1,535 K) < ZrAl(cr) + ZrAl(cr)>. log (p/Pa) = (-18,982 ± 112)/T + (11.92 ± 0.08) (1,208-1,458 K) < ZrAl(cr) + ZrAl(cr)>. From the p-T and K-T relations, based on the second and third law methods of thermodynamics, the enthalpy changes of the following reactions were evaluated: ZrAl(cr) = ZrAl(cr) + Al(g) and 2ZrAl(cr) = ZrAl(cr) + Al(g). Subsequently, the enthalpies of the formation of ZrAl(cr) and ZrAl(cr) were deduced.
通过在1233至1535K以及1208至1458K的温度范围内采用克努森蒸发质谱法（KEMS），对Al-Zr体系的<ZrAl(cr) + ZrAl(cr) >和<ZrAl(cr) + ZrAl(cr) >双相区域进行了蒸发热力学研究。观察到这些样品在气相中仅发生Al(g)的不一致蒸发。以下是本研究中推导的推荐p-T关系：log (p/Pa) = (-18,663 ± 132)/T + (12.23 ± 0.10) （1233 - 1535K）<ZrAl(cr) + ZrAl(cr)>。log (p/Pa) = (-18,982 ± 112)/T + (11.92 ± 0.08) （1208 - 1458K）<ZrAl(cr) + ZrAl(cr)>。根据热力学的第二和第三定律方法，从p-T和K-T关系中评估了以下反应的焓变：ZrAl(cr) = ZrAl(cr) + Al(g)和2ZrAl(cr) = ZrAl(cr) + Al(g)。随后，推导了ZrAl(cr)和ZrAl(cr)的生成焓。
