Hatim Saidi , M. Coëffe-Desvaux , N. Pradeilles , P. Marchet , M. Joinet , A. Maître
{"title":"烧结方法对掺铈氮化铝陶瓷电气性能的影响","authors":"Hatim Saidi , M. Coëffe-Desvaux , N. Pradeilles , P. Marchet , M. Joinet , A. Maître","doi":"10.1016/j.progsolidstchem.2024.100473","DOIUrl":null,"url":null,"abstract":"<div><p>This article investigates the densification of AlN ceramics through both Gas Pressure Sintering (GPS) and Spark Plasma Sintering (SPS) methods, employing cerium aluminates (CeAlO<sub>3</sub>) as sintering aids and comparing their influence to that of the usual cerium oxide (CeO<sub>2</sub>). While sintering aids like CeO<sub>2</sub> promote densification, CeAlO<sub>3</sub> exhibited lower reactivity during both SPS and GPS sintering. Chemical reactions between cerium oxide and aluminium oxide primarily involved the reduced phase as cerium sesquioxide (Ce<sub>2</sub>O<sub>3</sub>). On the basis on the Ce<sub>2</sub>O<sub>3</sub>–Al<sub>2</sub>O<sub>3</sub> pseudo-binary system, the formation of secondary phases, such as CeAlO<sub>3</sub> and CeAl<sub>11</sub>O<sub>18</sub>, during sintering was explained and confirmed by XRD. From complementary characterizations, it has been shown that sintering significantly impacted secondary phase composition and distribution. By employing specific densification cycles, SPS yielded smaller grains and thicker secondary phase cordons which led to enhanced electrical conductivity. Conversely, GPS produced coarser microstructures including larger grains and a network of secondary phases and some agglomerations at the triple points. These modifications influenced the overall conductivity. SPSed samples with 3 wt.% CeO<sub>2</sub> and short dwelling times demonstrated higher electrical conductivity, exceeding by about 6 orders of magnitude the electrical conductivity of those obtained by GPS.</p></div>","PeriodicalId":415,"journal":{"name":"Progress in Solid State Chemistry","volume":null,"pages":null},"PeriodicalIF":9.1000,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Influence of the sintering methods on the electrical properties of cerium-doped aluminium nitride ceramics\",\"authors\":\"Hatim Saidi , M. Coëffe-Desvaux , N. Pradeilles , P. Marchet , M. Joinet , A. Maître\",\"doi\":\"10.1016/j.progsolidstchem.2024.100473\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>This article investigates the densification of AlN ceramics through both Gas Pressure Sintering (GPS) and Spark Plasma Sintering (SPS) methods, employing cerium aluminates (CeAlO<sub>3</sub>) as sintering aids and comparing their influence to that of the usual cerium oxide (CeO<sub>2</sub>). While sintering aids like CeO<sub>2</sub> promote densification, CeAlO<sub>3</sub> exhibited lower reactivity during both SPS and GPS sintering. Chemical reactions between cerium oxide and aluminium oxide primarily involved the reduced phase as cerium sesquioxide (Ce<sub>2</sub>O<sub>3</sub>). On the basis on the Ce<sub>2</sub>O<sub>3</sub>–Al<sub>2</sub>O<sub>3</sub> pseudo-binary system, the formation of secondary phases, such as CeAlO<sub>3</sub> and CeAl<sub>11</sub>O<sub>18</sub>, during sintering was explained and confirmed by XRD. From complementary characterizations, it has been shown that sintering significantly impacted secondary phase composition and distribution. By employing specific densification cycles, SPS yielded smaller grains and thicker secondary phase cordons which led to enhanced electrical conductivity. Conversely, GPS produced coarser microstructures including larger grains and a network of secondary phases and some agglomerations at the triple points. These modifications influenced the overall conductivity. SPSed samples with 3 wt.% CeO<sub>2</sub> and short dwelling times demonstrated higher electrical conductivity, exceeding by about 6 orders of magnitude the electrical conductivity of those obtained by GPS.</p></div>\",\"PeriodicalId\":415,\"journal\":{\"name\":\"Progress in Solid State Chemistry\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":9.1000,\"publicationDate\":\"2024-07-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Progress in Solid State Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0079678624000360\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, INORGANIC & NUCLEAR\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Progress in Solid State Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0079678624000360","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
Influence of the sintering methods on the electrical properties of cerium-doped aluminium nitride ceramics
This article investigates the densification of AlN ceramics through both Gas Pressure Sintering (GPS) and Spark Plasma Sintering (SPS) methods, employing cerium aluminates (CeAlO3) as sintering aids and comparing their influence to that of the usual cerium oxide (CeO2). While sintering aids like CeO2 promote densification, CeAlO3 exhibited lower reactivity during both SPS and GPS sintering. Chemical reactions between cerium oxide and aluminium oxide primarily involved the reduced phase as cerium sesquioxide (Ce2O3). On the basis on the Ce2O3–Al2O3 pseudo-binary system, the formation of secondary phases, such as CeAlO3 and CeAl11O18, during sintering was explained and confirmed by XRD. From complementary characterizations, it has been shown that sintering significantly impacted secondary phase composition and distribution. By employing specific densification cycles, SPS yielded smaller grains and thicker secondary phase cordons which led to enhanced electrical conductivity. Conversely, GPS produced coarser microstructures including larger grains and a network of secondary phases and some agglomerations at the triple points. These modifications influenced the overall conductivity. SPSed samples with 3 wt.% CeO2 and short dwelling times demonstrated higher electrical conductivity, exceeding by about 6 orders of magnitude the electrical conductivity of those obtained by GPS.
期刊介绍:
Progress in Solid State Chemistry offers critical reviews and specialized articles written by leading experts in the field, providing a comprehensive view of solid-state chemistry. It addresses the challenge of dispersed literature by offering up-to-date assessments of research progress and recent developments. Emphasis is placed on the relationship between physical properties and structural chemistry, particularly imperfections like vacancies and dislocations. The reviews published in Progress in Solid State Chemistry emphasize critical evaluation of the field, along with indications of current problems and future directions. Papers are not intended to be bibliographic in nature but rather to inform a broad range of readers in an inherently multidisciplinary field by providing expert treatises oriented both towards specialists in different areas of the solid state and towards nonspecialists. The authorship is international, and the subject matter will be of interest to chemists, materials scientists, physicists, metallurgists, crystallographers, ceramists, and engineers interested in the solid state.