[101]-Oriented (Li,Na,K) NbO3 ceramics prepared by magnetic field-assisted forming, sintering, and electric poling
Source abstract
Abstract
Crystal orientation is a strategy for the improvement of piezoelectric properties of lead-free piezoelectric materials. [101]-Oriented Li-modified (Na,K) NbO3 ceramics (LNKN) were fabricated using a colloidal method under a strong magnetic field, sintering, and subsequent electrical poling. For the Li0.06Na0.52K0.42NbO3 powder compact, which has a monoclinic phase at room temperature, the (-101) planes were oriented perpendicular to the magnetic field. Although the monoclinic phase transitioned to tetragonal and cubic phases above the Curie temperature during sintering, the crystal-oriented structure was maintained and developed even after phase transitions and grain growth during sintering. Furthermore, crystal reorientation was enhanced by domain switching under an electric field. Thus, [101]-oriented LNKN ceramics with a tetragonal crystal system were obtained. The piezoelectric d33 constant was improved to 208 pC/N from 112 pC/N due to the effects of electromechanical coupling coefficient and specific dielectric coefficient by the texturing process with magnetic field assisted shaping, sintering, and electrical poling.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Acoustic Wave Resonator Technologies · Microwave Dielectric Ceramics Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Materials Science and Technology, Nagaoka University of Technology
R&D Center, Taiyo Yuden Co. Ltd
Division of Electrical and Electronic Engineering, Department of Innovative Engineering, Ashikaga University
References (28)
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