Dielectric constant tunability at microwave frequencies and pyroelectric behavior of lead-free submicron-structured (Bi0.5Na0.5)1-xBaxTiO3 ferroelectric ceramics
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AuthorMartínez Viviente, Félix Lorenzo; Hinojosa Jiménez, Juan; Doménech Asensi, Ginés; Fernández Luque, Francisco Jesús; Zapata Pérez, Juan Francisco; [et al.]
SponsorsThis work was supported by Ministerio de Ciencia e Innovación of Spain (TIN2009-14372-C03-02), Fundación Séneca (15303/PI/10), and CSIC (PIE 201060E069).
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Bibliographic CitationMARTÍNEZ VIVIENTE, Félix Lorenzo et al. Dielectric constant tunability at microwave frequencies and pyroelectric behavior of lead-free submicron-structured (Bi0.5Na0.5)1-xBaxTiO3 ferroelectric ceramics. En: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 60, n. 8, p. 1595-1602, 2013. ISSN: 0885-3010.
Microwave tunable devices
Pyroelectric infrared sensors
In this article we show that the dielectric constant of lead-free ferroelectric ceramics based on the solid solution (1-x)(Bi0.5Na0.5)TiO3-xBaTiO3, with compositions at or near the morphotropic phase boundary (MPB), can be tuned by a local applied electric field. Two compositions have been studied, one at the MPB, with x=0.06 (BNBT6), and another one towards the BNT side of the phase diagram, with x=0.04 (BNBT4). The tunability of the dielectric constant is measured at microwave frequencies between 100 MHz and 3 GHz by a non-resonant method and simultaneously applying a DC electric field. As expected, the tunability is higher for the composition at the MPB (BNBT6), reaching a maximum value of 60 % for an electric field of 900 V/cm, compared with the composition below this boundary (BNBT4), which saturates at 40 % for an electric field of 640 V/cm. The high tunability in both cases is attributed to the fine grain and high density of the samples, which have a submicron homogeneous grain ...
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