{"title":"Ni40Pd40P20在液态、玻璃态和结晶态下的热容","authors":"Hin-Wing Kui , David Turnbull","doi":"10.1016/S0022-3093(87)80261-2","DOIUrl":null,"url":null,"abstract":"<div><p>The heat capacities of Ni<sub>40</sub>Pd<sub>40</sub>P<sub>20</sub> alloy in its liquid, glass and crystallized states were measured by differential scanning calorimetry. Measurements on the undercooled liquid ranged from the glass temperature, <em>T</em><sub>g</sub> ∼ 575–655 K and from 780 K to the liquidus temperature, <em>T</em><sub>1</sub> ∼ 892 K. The range 655–780 K was inaccessible to measurement because of the rapidity of crystallization, but the two sections of the heat capacity-temperature curve, <em>C<sub>p</sub><sup>1</sup>(T)</em> were joined smoothly by interpolation through this range. <em>C<sub>p</sub></em><sup>1</sup> increases with decreasing <em>T</em>, going through <em>T</em><sub>1</sub>, with no discontinuity, to about 11 cal/deg g atom at <em>T</em><sub>g</sub>. As <em>T</em> decreases from <em>T</em><sub>g</sub>, <em>C<sub>p</sub></em> falls abruptly to a level almost coincident with that of the crystallized alloy. Near <em>T</em><sub>g</sub>. <em>C<sub>p</sub><sup>1</sup>(T)</em> exhibits a bump associated with relaxation effects. The heat of melting of the alloy was found to be 1.9 kcal/g atom at <em>T</em><sub>1</sub>,. From this and Δ<em>C<sub>p</sub>(T)</em>, <em>C<sub>p</sub></em><sup>1</sup>-<em>C<sub>p</sub></em><sup>s</sup>, we calculate that the entropy of melting of the alloy at 610 K, Δ<em>S</em><sub>m</sub>(610) = 0.97 cal/deg g atom = 0.41 Δ<em>S</em><sub>m</sub>(<em>T<sub>1</sub></em>). From measured densities we calculate that, at room temperature, the gram-atomic volume <em>V</em><sub>a</sub> = 7.72 cm<sup>3</sup>/g atom, of the glassy alloy is 0.28% above that of the crystallized alloy and that <em>V</em><sub>a</sub> agrees closely with the weighted average of the gram-atomic volumes of the pure metal constituents (Ni + Pd) in their crystalline forms.</p></div>","PeriodicalId":16461,"journal":{"name":"Journal of Non-crystalline Solids","volume":"94 1","pages":"Pages 62-69"},"PeriodicalIF":3.2000,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0022-3093(87)80261-2","citationCount":"47","resultStr":"{\"title\":\"The heat capacity of Ni40Pd40P20 in the liquid, glass and crystallized states\",\"authors\":\"Hin-Wing Kui , David Turnbull\",\"doi\":\"10.1016/S0022-3093(87)80261-2\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The heat capacities of Ni<sub>40</sub>Pd<sub>40</sub>P<sub>20</sub> alloy in its liquid, glass and crystallized states were measured by differential scanning calorimetry. Measurements on the undercooled liquid ranged from the glass temperature, <em>T</em><sub>g</sub> ∼ 575–655 K and from 780 K to the liquidus temperature, <em>T</em><sub>1</sub> ∼ 892 K. The range 655–780 K was inaccessible to measurement because of the rapidity of crystallization, but the two sections of the heat capacity-temperature curve, <em>C<sub>p</sub><sup>1</sup>(T)</em> were joined smoothly by interpolation through this range. <em>C<sub>p</sub></em><sup>1</sup> increases with decreasing <em>T</em>, going through <em>T</em><sub>1</sub>, with no discontinuity, to about 11 cal/deg g atom at <em>T</em><sub>g</sub>. As <em>T</em> decreases from <em>T</em><sub>g</sub>, <em>C<sub>p</sub></em> falls abruptly to a level almost coincident with that of the crystallized alloy. Near <em>T</em><sub>g</sub>. <em>C<sub>p</sub><sup>1</sup>(T)</em> exhibits a bump associated with relaxation effects. The heat of melting of the alloy was found to be 1.9 kcal/g atom at <em>T</em><sub>1</sub>,. From this and Δ<em>C<sub>p</sub>(T)</em>, <em>C<sub>p</sub></em><sup>1</sup>-<em>C<sub>p</sub></em><sup>s</sup>, we calculate that the entropy of melting of the alloy at 610 K, Δ<em>S</em><sub>m</sub>(610) = 0.97 cal/deg g atom = 0.41 Δ<em>S</em><sub>m</sub>(<em>T<sub>1</sub></em>). From measured densities we calculate that, at room temperature, the gram-atomic volume <em>V</em><sub>a</sub> = 7.72 cm<sup>3</sup>/g atom, of the glassy alloy is 0.28% above that of the crystallized alloy and that <em>V</em><sub>a</sub> agrees closely with the weighted average of the gram-atomic volumes of the pure metal constituents (Ni + Pd) in their crystalline forms.</p></div>\",\"PeriodicalId\":16461,\"journal\":{\"name\":\"Journal of Non-crystalline Solids\",\"volume\":\"94 1\",\"pages\":\"Pages 62-69\"},\"PeriodicalIF\":3.2000,\"publicationDate\":\"1987-10-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S0022-3093(87)80261-2\",\"citationCount\":\"47\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Non-crystalline Solids\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0022309387802612\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, CERAMICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Non-crystalline Solids","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022309387802612","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
The heat capacity of Ni40Pd40P20 in the liquid, glass and crystallized states
The heat capacities of Ni40Pd40P20 alloy in its liquid, glass and crystallized states were measured by differential scanning calorimetry. Measurements on the undercooled liquid ranged from the glass temperature, Tg ∼ 575–655 K and from 780 K to the liquidus temperature, T1 ∼ 892 K. The range 655–780 K was inaccessible to measurement because of the rapidity of crystallization, but the two sections of the heat capacity-temperature curve, Cp1(T) were joined smoothly by interpolation through this range. Cp1 increases with decreasing T, going through T1, with no discontinuity, to about 11 cal/deg g atom at Tg. As T decreases from Tg, Cp falls abruptly to a level almost coincident with that of the crystallized alloy. Near Tg. Cp1(T) exhibits a bump associated with relaxation effects. The heat of melting of the alloy was found to be 1.9 kcal/g atom at T1,. From this and ΔCp(T), Cp1-Cps, we calculate that the entropy of melting of the alloy at 610 K, ΔSm(610) = 0.97 cal/deg g atom = 0.41 ΔSm(T1). From measured densities we calculate that, at room temperature, the gram-atomic volume Va = 7.72 cm3/g atom, of the glassy alloy is 0.28% above that of the crystallized alloy and that Va agrees closely with the weighted average of the gram-atomic volumes of the pure metal constituents (Ni + Pd) in their crystalline forms.
期刊介绍:
The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid.
In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.