start-ver=1.4 cd-journal=joma no-vol=65 cd-vols= no-issue=14 article-no= start-page=2197 end-page=2200 dt-received= dt-revised= dt-accepted= dt-pub-year=2011 dt-pub=20110731 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Effect of varying the ratio of matrix/dispersoid particle size on the piezoresistivity of alumina/carbon-black composite ceramics en-subtitle= kn-subtitle= en-abstract= kn-abstract=Alumina/carbon-black composite ceramics with different percolation thresholds were fabricated by changing the size ratio of constituent particles. The dependence of resistivity on pressure was established for each sample. The compositional dependence of resistivity can be explained by percolation theory. The percolation threshold decreases with increasing alumina/carbon-black particle size ratio. The pressure dependence of the resistivity increases as the composition approaches the percolation threshold. When the relative composition at the percolation threshold is fixed, the sensitivity increases with increasing matrix/dispersoid initial particle size ratio. en-copyright= kn-copyright= en-aut-name=KishimotoAkira en-aut-sei=Kishimoto en-aut-mei=Akira kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TakagawaYuto en-aut-sei=Takagawa en-aut-mei=Yuto kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=TeranishiTakashi en-aut-sei=Teranishi en-aut-mei=Takashi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=HayashiHidetaka en-aut-sei=Hayashi en-aut-mei=Hidetaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Division of Molecular and Material Science, Graduate School of Natural Science and Technology, Okayama University affil-num=2 en-affil= kn-affil=Division of Molecular and Material Science, Graduate School of Natural Science and Technology, Okayama University affil-num=3 en-affil= kn-affil=Division of Molecular and Material Science, Graduate School of Natural Science and Technology, Okayama University affil-num=4 en-affil= kn-affil=Division of Molecular and Material Science, Graduate School of Natural Science and Technology, Okayama University en-keyword=Percolation kn-keyword=Percolation en-keyword=Piezoresistivity kn-keyword=Piezoresistivity en-keyword=Pressure sensor kn-keyword=Pressure sensor en-keyword=Particle size kn-keyword=Particle size END