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Low‐Temperature Sintering of Bi 0.5 (Na,K) 0.5 TiO 3 for Multilayer Ceramic Actuators
Author(s) -
Ahn Chang Won,
Kim Hee Sung,
Woo Won Seok,
Won Sung Sik,
Seog Hae Jin,
Chae Song A,
Park Bong Chan,
Jang Ki Bong,
Ok Yun Po,
Chong Hyon Ho,
Kim Ill Won
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13564
Subject(s) - sintering , materials science , ceramic , piezoelectricity , composite material , actuator , piezoelectric coefficient , atmospheric temperature range , analytical chemistry (journal) , electrical engineering , chemistry , physics , chromatography , meteorology , engineering
We investigated the influence of CuO amount (0.5–3.0 mol%), sintering temperature (900°C–1000°C), and sintering time (2–6 h) on the low‐temperature sintering behavior of CuO‐added Bi 0.5 (Na 0.78 K 0.22 ) 0.5 TiO 3 ( BNKT 22) ceramics. Normalized strain ( S max / E max ), piezoelectric coefficient ( d 33 ), and remanent polarization ( P r ) of 1.0 mol% CuO‐added BNKT 22 ceramics sintered at 950°C for 4 h was 280 pm/V, 180 pC/N, and 28 μC/cm 2 , respectively. These values are similar to those of pure BNKT 22 ceramics sintered at 1150°C. In addition, we investigated the performance of multilayer ceramic actuators made from CuO‐added BNKT 22 in acoustic sound speaker devices. A prototype sound speaker device showed similar output sound pressure levels as a Pb(Zr,Ti)O 3 ‐based device in the frequency range 0.66–20 kHz. This result highlights the feasibility of using low‐cost multilayer ceramic devices made of lead‐free BNKT ‐based piezoelectric materials in sound speaker devices.