Na1/2Bi1/2VO3 and K1/2Bi1/2VO3: New Lead-Free Tetragonal Perovskites with Moderate c/ a Ratios

Hajime Yamamoto; Takahiro Ogata; Satyanarayan Patel; Jurij Koruza; Jürgen Rödel; Atanu Paul; Tanusri Saha-Dasgupta; Yuki Sakai; Mitsuru Itoh; Masaki Azuma

doi:10.1021/acs.chemmater.8b02379

Na_1/2Bi_1/2VO₃ and K_1/2Bi_1/2VO₃: New Lead-Free Tetragonal Perovskites with Moderate c/ a Ratios

Hajime Yamamoto, Takahiro Ogata, Satyanarayan Patel, Jurij Koruza, Jürgen Rödel, Atanu Paul, Tanusri Saha-Dasgupta, Yuki Sakai, Mitsuru Itoh, Masaki Azuma

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Abstract

New lead-free tetragonal perovskites Na_1/2Bi_1/2VO₃ and K_1/2Bi_1/2VO₃ were synthesized under high pressure (6 GPa) and high temperature (1473 K), based on the design of materials optimizing the lone pair effect of the A-site ion and utilizing the Jahn-Teller effect in the B-site V⁴⁺. The magnitudes of the c/a ratio and spontaneous polarization, P_S, were 1.085 and 108 μC/cm², respectively (73 μC/cm² by the point charge model), for Na_1/2Bi_1/2VO₃ and 1.054 and 92 μC/cm², respectively (56 μC/cm² by the point charge model), for K_1/2Bi_1/2VO₃, which are comparable to the well-known lead-based ferroelectric PbTiO₃. This approach can guide the design of new lead-free ferroelectric and piezoelectric materials.

Original language	English
Pages (from-to)	6728-6736
Number of pages	9
Journal	Chemistry of Materials
Volume	30
Issue number	19
DOIs	https://doi.org/10.1021/acs.chemmater.8b02379
State	Published - 9 Oct 2018
Externally published	Yes

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© 2018 American Chemical Society.

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title = "Na1/2Bi1/2VO3 and K1/2Bi1/2VO3: New Lead-Free Tetragonal Perovskites with Moderate c/ a Ratios",

abstract = "New lead-free tetragonal perovskites Na1/2Bi1/2VO3 and K1/2Bi1/2VO3 were synthesized under high pressure (6 GPa) and high temperature (1473 K), based on the design of materials optimizing the lone pair effect of the A-site ion and utilizing the Jahn-Teller effect in the B-site V4+. The magnitudes of the c/a ratio and spontaneous polarization, PS, were 1.085 and 108 μC/cm2, respectively (73 μC/cm2 by the point charge model), for Na1/2Bi1/2VO3 and 1.054 and 92 μC/cm2, respectively (56 μC/cm2 by the point charge model), for K1/2Bi1/2VO3, which are comparable to the well-known lead-based ferroelectric PbTiO3. This approach can guide the design of new lead-free ferroelectric and piezoelectric materials.",

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doi = "10.1021/acs.chemmater.8b02379",

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AU - Yamamoto, Hajime

AU - Ogata, Takahiro

AU - Patel, Satyanarayan

AU - Koruza, Jurij

AU - Rödel, Jürgen

AU - Paul, Atanu

AU - Saha-Dasgupta, Tanusri

AU - Sakai, Yuki

AU - Itoh, Mitsuru

AU - Azuma, Masaki

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N2 - New lead-free tetragonal perovskites Na1/2Bi1/2VO3 and K1/2Bi1/2VO3 were synthesized under high pressure (6 GPa) and high temperature (1473 K), based on the design of materials optimizing the lone pair effect of the A-site ion and utilizing the Jahn-Teller effect in the B-site V4+. The magnitudes of the c/a ratio and spontaneous polarization, PS, were 1.085 and 108 μC/cm2, respectively (73 μC/cm2 by the point charge model), for Na1/2Bi1/2VO3 and 1.054 and 92 μC/cm2, respectively (56 μC/cm2 by the point charge model), for K1/2Bi1/2VO3, which are comparable to the well-known lead-based ferroelectric PbTiO3. This approach can guide the design of new lead-free ferroelectric and piezoelectric materials.

AB - New lead-free tetragonal perovskites Na1/2Bi1/2VO3 and K1/2Bi1/2VO3 were synthesized under high pressure (6 GPa) and high temperature (1473 K), based on the design of materials optimizing the lone pair effect of the A-site ion and utilizing the Jahn-Teller effect in the B-site V4+. The magnitudes of the c/a ratio and spontaneous polarization, PS, were 1.085 and 108 μC/cm2, respectively (73 μC/cm2 by the point charge model), for Na1/2Bi1/2VO3 and 1.054 and 92 μC/cm2, respectively (56 μC/cm2 by the point charge model), for K1/2Bi1/2VO3, which are comparable to the well-known lead-based ferroelectric PbTiO3. This approach can guide the design of new lead-free ferroelectric and piezoelectric materials.

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Na_1/2Bi_1/2VO₃ and K_1/2Bi_1/2VO₃: New Lead-Free Tetragonal Perovskites with Moderate c/ a Ratios

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