Band gap narrowing and magnetic properties of transition‐metal‐doped Ba0.85Ca0.15Ti0.9Zr0.1O3 lead‐free ceramics. Issue 4 (2nd December 2019)

• Record Type: Journal Article
• Authors: Zhang, Yuemin; Deng, Hongmei; Si, Shufang; Wang, Tiantian; Zheng, Dongliang; Yang, Pingxiong; Chu, Junhao
• Is Part Of: Journal of the American Ceramic Society. Volume 103:Issue 4(2020)
• Page Start: 2491
• Page End: 2498
• Publication Date: 2019-12-02
• Subjects: band gap -- BCZT -- lead‐free ceramics -- magnetic properties -- phase transition; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.16924
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Transition metal (TM = Mn, Fe, Co, and Ni)‐doped Ba0.85 Ca0.15 Ti0.9 Zr0.1 O3 (BCZT) lead‐free ceramics with excellent optical and magnetic properties are synthesized via a solid‐state reaction method. The effects of TM elements on the sintering, structure, optical, and magnetic properties of BCZT ceramics are investigated in detail. Structural phase transition from the coexistence of rhombohedral and tetragonal phases to a single rhombohedral phase is observed owing to grain refinement. A narrow band gap of 1.68 eV is achieved in the Co‐doped BCZT. The optical absorption of TM‐doped BCZT is enhanced, which is ascribed to the molecular orbital rearrangement caused by lattice distortion. Moreover the magnetic behaviors of TM‐doped BCZT are observed. The Fe‐doped BCZT presents the most evident ferromagnetism, resulting from the exchange coupling interaction between the Fe 3+ ions and oxygen vacancies. These results provide additional insight into the use of TM‐doped BCZT lead‐free ferroelectric ceramics for various applications.