{"title":"火花等离子烧结细晶BaTi1-xHfxO3陶瓷的成分依赖性结构、微观结构和功能特性","authors":"Elena Mirabela Soare , Cătălina-Andreea Stanciu , Roxana Elena Pătru , Vasile-Adrian Surdu , Nadejda Horchidan , Liliana Mitoşeriu , Ioana Pintilie , Bogdan Ştefan Vasile , Adrian-Ionuţ Nicoară , Roxana Doina Truşcă , Adelina-Carmen Ianculescu","doi":"10.1016/j.jeurceramsoc.2025.117600","DOIUrl":null,"url":null,"abstract":"<div><div>The functional properties of BaTi<sub>1-x</sub>Hf<sub>x</sub>O<sub>3</sub> (0 ≤x ≤ 0.20) ceramics consolidated by spark plasma sintering from Pechini nanopowders are discussed in terms of the synergic effect of overlapping dissimilar structural modifications, nanoscale grain size reduction and ferroelectric-relaxor crossover. Structural and Raman investigations revealed the coexistence of various polymorph modifications. The main effects of Hf addition are: (<em>i</em>) a strong inhibiting of the grain growth process, (<em>ii</em>) the reduction of <em>T</em><sub>C</sub> and increase of the orthorhombic-tetragonal and rhombohedral-orthorhombic transition temperatures until a single, \"pinched\" and diffuse ferroelectric-paraelectric phase transition occurs, (<em>iii</em>) a strong flattening of the permittivity maximum, (<em>iv</em>) a slight decrease of the grain boundary resistivity, but still allowing the application of high a.c. and d.c. fields and (<em>v</em>) a gradual reduction of polarization, hysteresis loops area, energy storage capability and tunability values. Based on the dielectric and thermo-Raman results, a new low-temperature phase diagram of the fine-grained BaTi<sub>1-x</sub>Hf<sub>x</sub>O<sub>3</sub> ceramics is proposed.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117600"},"PeriodicalIF":6.2000,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Composition-dependent structural, microstructural and functional characteristics of fine-grained BaTi1-xHfxO3 ceramics consolidated by Spark Plasma Sintering\",\"authors\":\"Elena Mirabela Soare , Cătălina-Andreea Stanciu , Roxana Elena Pătru , Vasile-Adrian Surdu , Nadejda Horchidan , Liliana Mitoşeriu , Ioana Pintilie , Bogdan Ştefan Vasile , Adrian-Ionuţ Nicoară , Roxana Doina Truşcă , Adelina-Carmen Ianculescu\",\"doi\":\"10.1016/j.jeurceramsoc.2025.117600\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The functional properties of BaTi<sub>1-x</sub>Hf<sub>x</sub>O<sub>3</sub> (0 ≤x ≤ 0.20) ceramics consolidated by spark plasma sintering from Pechini nanopowders are discussed in terms of the synergic effect of overlapping dissimilar structural modifications, nanoscale grain size reduction and ferroelectric-relaxor crossover. Structural and Raman investigations revealed the coexistence of various polymorph modifications. The main effects of Hf addition are: (<em>i</em>) a strong inhibiting of the grain growth process, (<em>ii</em>) the reduction of <em>T</em><sub>C</sub> and increase of the orthorhombic-tetragonal and rhombohedral-orthorhombic transition temperatures until a single, \\\"pinched\\\" and diffuse ferroelectric-paraelectric phase transition occurs, (<em>iii</em>) a strong flattening of the permittivity maximum, (<em>iv</em>) a slight decrease of the grain boundary resistivity, but still allowing the application of high a.c. and d.c. fields and (<em>v</em>) a gradual reduction of polarization, hysteresis loops area, energy storage capability and tunability values. Based on the dielectric and thermo-Raman results, a new low-temperature phase diagram of the fine-grained BaTi<sub>1-x</sub>Hf<sub>x</sub>O<sub>3</sub> ceramics is proposed.</div></div>\",\"PeriodicalId\":17408,\"journal\":{\"name\":\"Journal of The European Ceramic Society\",\"volume\":\"45 15\",\"pages\":\"Article 117600\"},\"PeriodicalIF\":6.2000,\"publicationDate\":\"2025-06-06\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of The European Ceramic Society\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0955221925004200\",\"RegionNum\":2,\"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 The European Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0955221925004200","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
Composition-dependent structural, microstructural and functional characteristics of fine-grained BaTi1-xHfxO3 ceramics consolidated by Spark Plasma Sintering
The functional properties of BaTi1-xHfxO3 (0 ≤x ≤ 0.20) ceramics consolidated by spark plasma sintering from Pechini nanopowders are discussed in terms of the synergic effect of overlapping dissimilar structural modifications, nanoscale grain size reduction and ferroelectric-relaxor crossover. Structural and Raman investigations revealed the coexistence of various polymorph modifications. The main effects of Hf addition are: (i) a strong inhibiting of the grain growth process, (ii) the reduction of TC and increase of the orthorhombic-tetragonal and rhombohedral-orthorhombic transition temperatures until a single, "pinched" and diffuse ferroelectric-paraelectric phase transition occurs, (iii) a strong flattening of the permittivity maximum, (iv) a slight decrease of the grain boundary resistivity, but still allowing the application of high a.c. and d.c. fields and (v) a gradual reduction of polarization, hysteresis loops area, energy storage capability and tunability values. Based on the dielectric and thermo-Raman results, a new low-temperature phase diagram of the fine-grained BaTi1-xHfxO3 ceramics is proposed.
期刊介绍:
The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.