{"title":"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","authors":"Vinjavarapu Venkata Trinadh, Suranjan Bera, Cherukuri Venkata Siva Brahmananda Rao","doi":"10.1002/rcm.9914","DOIUrl":null,"url":null,"abstract":"<p>Vaporisation thermodynamic studies were performed over <ZrAl<sub>3</sub>(cr) + ZrAl<sub>2</sub>(cr) > and <ZrAl<sub>2</sub>(cr) + Zr<sub>2</sub>Al<sub>3</sub>(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:</p><p>log (p<sub>Al</sub>/Pa) = (−18,663 ± 132)/T + (12.23 ± 0.10) (1,233–1,535 K) < ZrAl<sub>3</sub>(cr) + ZrAl<sub>2</sub>(cr)>.</p><p>log (p<sub>Al</sub>/Pa) = (−18,982 ± 112)/T + (11.92 ± 0.08) (1,208–1,458 K) < ZrAl<sub>2</sub>(cr) + Zr<sub>2</sub>Al<sub>3</sub>(cr)>.</p><p>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<sub>3</sub>(cr) = ZrAl<sub>2</sub>(cr) + Al(g) and 2ZrAl<sub>2</sub>(cr) = Zr<sub>2</sub>Al<sub>3</sub>(cr) + Al(g). Subsequently, the enthalpies of the formation of ZrAl<sub>2</sub>(cr) and Zr<sub>2</sub>Al<sub>3</sub>(cr) were deduced.</p>","PeriodicalId":225,"journal":{"name":"Rapid Communications in Mass Spectrometry","volume":"38 23","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/rcm.9914","citationCount":"0","resultStr":"{\"title\":\"High temperature mass spectrometric studies over Zr-Al binary system: Thermodynamic properties over <ZrAl3(cr) + ZrAl2(cr) > and <ZrAl2(cr) + Zr2Al3(cr) > biphasic regions\",\"authors\":\"Vinjavarapu Venkata Trinadh, Suranjan Bera, Cherukuri Venkata Siva Brahmananda Rao\",\"doi\":\"10.1002/rcm.9914\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Vaporisation thermodynamic studies were performed over <ZrAl<sub>3</sub>(cr) + ZrAl<sub>2</sub>(cr) > and <ZrAl<sub>2</sub>(cr) + Zr<sub>2</sub>Al<sub>3</sub>(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:</p><p>log (p<sub>Al</sub>/Pa) = (−18,663 ± 132)/T + (12.23 ± 0.10) (1,233–1,535 K) < ZrAl<sub>3</sub>(cr) + ZrAl<sub>2</sub>(cr)>.</p><p>log (p<sub>Al</sub>/Pa) = (−18,982 ± 112)/T + (11.92 ± 0.08) (1,208–1,458 K) < ZrAl<sub>2</sub>(cr) + Zr<sub>2</sub>Al<sub>3</sub>(cr)>.</p><p>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<sub>3</sub>(cr) = ZrAl<sub>2</sub>(cr) + Al(g) and 2ZrAl<sub>2</sub>(cr) = Zr<sub>2</sub>Al<sub>3</sub>(cr) + Al(g). Subsequently, the enthalpies of the formation of ZrAl<sub>2</sub>(cr) and Zr<sub>2</sub>Al<sub>3</sub>(cr) were deduced.</p>\",\"PeriodicalId\":225,\"journal\":{\"name\":\"Rapid Communications in Mass Spectrometry\",\"volume\":\"38 23\",\"pages\":\"\"},\"PeriodicalIF\":1.8000,\"publicationDate\":\"2024-09-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1002/rcm.9914\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Rapid Communications in Mass Spectrometry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/rcm.9914\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"BIOCHEMICAL RESEARCH METHODS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Rapid Communications in Mass Spectrometry","FirstCategoryId":"92","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/rcm.9914","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"BIOCHEMICAL RESEARCH METHODS","Score":null,"Total":0}
High temperature mass spectrometric studies over Zr-Al binary system: Thermodynamic properties over and biphasic regions
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:
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.
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.
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