High temperature mass spectrometric studies over Zr-Al binary system: Thermodynamic properties over and biphasic regions

IF 1.8 3区化学 Q4 BIOCHEMICAL RESEARCH METHODS Rapid Communications in Mass Spectrometry Pub Date : 2024-09-22 DOI:10.1002/rcm.9914

Vinjavarapu Venkata Trinadh, Suranjan Bera, Cherukuri Venkata Siva Brahmananda Rao

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Abstract

Vaporisation thermodynamic studies were performed over <ZrAl₃(cr) + ZrAl₂(cr) > and <ZrAl₂(cr) + Zr₂Al₃(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_Al/Pa) = (−18,663 ± 132)/T + (12.23 ± 0.10) (1,233–1,535 K) < ZrAl₃(cr) + ZrAl₂(cr)>.

log (p_Al/Pa) = (−18,982 ± 112)/T + (11.92 ± 0.08) (1,208–1,458 K) < ZrAl₂(cr) + Zr₂Al₃(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: ZrAl₃(cr) = ZrAl₂(cr) + Al(g) and 2ZrAl₂(cr) = Zr₂Al₃(cr) + Al(g). Subsequently, the enthalpies of the formation of ZrAl₂(cr) and Zr₂Al₃(cr) were deduced.

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锆铝二元体系的高温质谱研究：双相和双相区域的热力学性质

在 1233 至 1535 K 和 1208 至 1458 K 的温度范围内，采用克努森喷射质谱法 (Knudsen Effusion Mass Spectrometry, KEMS) 分别对 Al-Zr 系统的 <ZrAl3(cr) + ZrAl2(cr) > 和 <ZrAl2(cr) + Zr2Al3(cr) > 双相区进行了汽化热力学研究。据观察，这些样品在气相中与单独的 Al(g) 发生了不一致的汽化。以下是本研究推导出的建议 p-T 关系：log (pAl/Pa) = (-18,663 ± 132)/T + (12.23 ± 0.10) (1,233-1,535 K) < ZrAl3(cr) + ZrAl2(cr)>.log (pAl/Pa) = (-18,982 ± 112)/T + (11.92 ± 0.08) (1,208-1,458 K) < ZrAl2(cr) + Zr2Al3(cr)>.log (pAl/Pa) = (-18,982 ± 112)/T + (11. ± 0.08) (1,208-1,458 K) < ZrAl2(cr) + Zr2Al3(cr)>：ZrAl3(cr) = ZrAl2(cr) + Al(g) 和 2ZrAl2(cr) = Zr2Al3(cr) + Al(g)。随后，推导出了 ZrAl2(cr) 和 Zr2Al3(cr) 的生成焓。

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来源期刊

Rapid Communications in Mass Spectrometry 化学-分析化学

CiteScore

4.10

自引率

5.00%

发文量

219

审稿时长

2.6 months

期刊介绍： Rapid Communications in Mass Spectrometry is a journal whose aim is the rapid publication of original research results and ideas on all aspects of the science of gas-phase ions; it covers all the associated scientific disciplines. There is no formal limit on paper length ("rapid" is not synonymous with "brief"), but papers should be of a length that is commensurate with the importance and complexity of the results being reported. Contributions may be theoretical or practical in nature; they may deal with methods, techniques and applications, or with the interpretation of results; they may cover any area in science that depends directly on measurements made upon gaseous ions or that is associated with such measurements.