Resonator Characteristics of Bismuth Layer Structured Ferroelectric Materials
作者： Akira Ando , Masahiko Kimura
DOI: 10.1007/978-1-4419-9598-8_13
关键词: Condensed matter physics 、 Temperature coefficient 、 Materials science 、 Electromechanical coupling coefficient 、 Resonator 、 Bismuth 、 Ultrasonic motor 、 Piezoelectricity 、 Ferroelectricity 、 Aurivillius
摘要: Crystallographic studies of Bismuth (Bi) layer structured ferroelectric (BLSF) materials were first carried out by Aurivillius [1–3] and their or piezoelectric properties have been revealed a large number researchers [4–106, 108, 110–117]. The Na0.5Bi4.5Ti4O15 (NBT) [17, 23, 25, 26], BaBi4Ti4O15 [41], SrBi4Ti4O15 (SBTi) 40, 54], CaBi4Ti4O15 (CBT) [39, 53, 63] ceramic reported in terms resonator application. Their applicability to practical application seemed be quite high because the electromechanical coupling factors for thickness extensional mode vibrations between 15 20%, typical values mechanical quality factor (Q m) higher than 2,000 [39], these are favorable oscillator applications. However, temperature coefficient resonance frequency (TCF) is not sufficiently low applications which require stable with fine tolerance against various condition changes such as changes.
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