Acoustic and electrical properties of 1-3 connectivity bismuth sodium titanate-Portland cement composites

• Main Authors: Rianyoi R., Potong R., Ngamjarurojana A., Yimnirun R., Guo R., Bhalla A.S., Chaipanich A.
• Format: Article
• Language: English
• Published: Elsevier Ltd 2014
• Online Access: http://www.scopus.com/inward/record.url?eid=2-s2.0-84907184418&partnerID=40&md5=1072ef388b241de319a049d19180137e; http://cmuir.cmu.ac.th/handle/6653943832/37649
• Institution: Chiang Mai University

In this study, bismuth sodium titanate (BNT)-Portland cement (PC) composites with 1-3 connectivity pattern were fabricated by the dice-and-fill technique with different BNT ceramic content ranging from 30 to 70 vol%. The acoustic impedance (Zc) and electrical properties of the composites were studied. When the BNT content varies from 30 to 70 vol%, Zcvalue increases from 8.95 to 14.79 × 106kg/m2s. At BNT ceramic content of 70 vol%, dielectric constant (εr), electromechanical coupling coefficients (Kt) and piezoelectric coefficient (d33) are 346, 21.28% and 70 pC/N, respectively. Interestingly, the piezoelectric voltage coefficient (g33) values exhibited an opposite trend, that is, the g33value decreases as the BNT content increases. Therefore, 1-3 connectivity of bismuth sodium titanate-Portland cement composites can be tailored by adjusting the piezoelectric ceramic content in composite; the developed composites have potential to be used as sensors for structural health monitoring applications in smart structures.