Hardening of (Ba0.5Na0.5)0.85Ba0.15TiO3 lead-free piezoelectric ceramics by adding (Bi0.5Na0.5)MnO3. (1st July 2022)

• Record Type: Journal Article
• Authors: Doshida, Yutaka; Hayakawa, Kosuke; Tamura, Hideki; Tanaka, Satoshi
• Is Part Of: Japanese journal of applied physics. Volume 61:Number SG(2022)
• Publication Date: 2022-07-01
• Subjects: lead-free -- piezoelectric ceramics -- herdening -- high-power properties -- BNBT -- BNM; Physics -- Periodicals; 621.05
• DOI: 10.35848/1347-4065/ac564e
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: The hardening of (Bi0.5 Na0.5 )0.85 Ba0.15 TiO3 (BNBT15) piezoelectric ceramics was investigated by adding raw materials with Bi0.5 Na0.5 MnO3 (BNM). BNBT15-BNM exhibited a single phase of BNBT15. BNM acts as a sintering aid for BNBT15 to produce domain pinning, and produces tetragonality based on BaTiO3 for increased stability. BNBT15-BNM hardens piezoelectric material with low Mn content, increasing the coercive field and mechanical quality factor. The mechanical quality factor of BNBT15-BNM (0.75 wt%) exceeded 1200. In high-power conditions, BNBT15-BNM (0.75 wt%) exhibited a vibration velocity twice that of hard-PZT. The quality factor gradually decreased with a high vibration velocity. The equivalent stiffness slightly decreased with strain, and the mechanical nonlinearity was much less than that of hard-PZT. BNBT15-BNM (0.75 wt%) has superior high-power properties, and is expected to be a candidate material for use in lead-free piezoelectric ceramics in high-power applications.