Communicating with wireless perovskites: Cation order and zinc volatilization

P. K. Davies; A. Borisevich; M. Thirumal

doi:10.1016/S0955-2219(03)00156-0

Communicating with wireless perovskites: Cation order and zinc volatilization

P. K. Davies, A. Borisevich, M. Thirumal

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60 Scopus citations

Abstract

The synthesis of new families of perovskites with a 1:2 ordered Ba(Zn_1/3Ta_2/3)O₃-type structure was investigated. The compound La(Li_1/3Ti_2/3) O₃ was prepared with a 1:2 ordered arrangement of Li and Ti and is the first reported titanate with this type of structure. A new family of ordered perovskites, (Sr_2/3La_1/3) (Li_1/3Ta_2/3)O₃ and (Sr_2/3La_1/3) (Li_1/3Nb_2/3) O₃, were also prepared with a 1:2 layered order of Li⁺ and B⁵⁺ cations. All three compounds exhibit dielectric constants > 25 and Q.f values > 20,000. Studies were also made on the phase stability of Zn-deficient compositions of BZT. The hexagonal perovskite, Ba₈ZnTa₆O₂₄, was isolated in single-phase form and was found to be the stable phase formed as a result of the loss of ZnO from BZT. Ba₈ ZnTa₆O₂₄ can be sintered to high density at temperatures considerably lower than pure BZT and exhibits very good microwave properties. In particular at GHz frequencies ε = 30.5, Q.f = 62,000, and τf = + 36 ppm/°C.

Original language	English
Pages (from-to)	2461-2466
Number of pages	6
Journal	Journal of the European Ceramic Society
Volume	23
Issue number	14
DOIs	https://doi.org/10.1016/S0955-2219(03)00156-0
State	Published - 2003
Externally published	Yes

Funding

This work was supported by the Ericsson Radio Access (M.T.), and by the National Science Foundation (Ceramics Program, grant DMR 02-13489) (A.B.). We also thank Dr. M. Hill and Dr. J. Deriso (TransTech) and Dr. Matjaz Valant (Jozef Stefan Institute, Slovenia) for assistance with microwave measurements.

Funders	Funder number
Ericsson Radio Access
National Science Foundation	DMR 02-13489

Keywords

Ba(Zn,Ta)O
Dielectric properties
Niobates
Perovskites
Tantalates

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10.1016/S0955-2219(03)00156-0

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title = "Communicating with wireless perovskites: Cation order and zinc volatilization",

abstract = "The synthesis of new families of perovskites with a 1:2 ordered Ba(Zn1/3Ta2/3)O3-type structure was investigated. The compound La(Li1/3Ti2/3) O3 was prepared with a 1:2 ordered arrangement of Li and Ti and is the first reported titanate with this type of structure. A new family of ordered perovskites, (Sr2/3La1/3) (Li1/3Ta2/3)O3 and (Sr2/3La1/3) (Li1/3Nb2/3) O3, were also prepared with a 1:2 layered order of Li+ and B5+ cations. All three compounds exhibit dielectric constants > 25 and Q.f values > 20,000. Studies were also made on the phase stability of Zn-deficient compositions of BZT. The hexagonal perovskite, Ba8ZnTa6O24, was isolated in single-phase form and was found to be the stable phase formed as a result of the loss of ZnO from BZT. Ba8 ZnTa6O24 can be sintered to high density at temperatures considerably lower than pure BZT and exhibits very good microwave properties. In particular at GHz frequencies ε = 30.5, Q.f = 62,000, and τf = + 36 ppm/°C.",

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T2 - Cation order and zinc volatilization

AU - Davies, P. K.

AU - Borisevich, A.

AU - Thirumal, M.

PY - 2003

Y1 - 2003

N2 - The synthesis of new families of perovskites with a 1:2 ordered Ba(Zn1/3Ta2/3)O3-type structure was investigated. The compound La(Li1/3Ti2/3) O3 was prepared with a 1:2 ordered arrangement of Li and Ti and is the first reported titanate with this type of structure. A new family of ordered perovskites, (Sr2/3La1/3) (Li1/3Ta2/3)O3 and (Sr2/3La1/3) (Li1/3Nb2/3) O3, were also prepared with a 1:2 layered order of Li+ and B5+ cations. All three compounds exhibit dielectric constants > 25 and Q.f values > 20,000. Studies were also made on the phase stability of Zn-deficient compositions of BZT. The hexagonal perovskite, Ba8ZnTa6O24, was isolated in single-phase form and was found to be the stable phase formed as a result of the loss of ZnO from BZT. Ba8 ZnTa6O24 can be sintered to high density at temperatures considerably lower than pure BZT and exhibits very good microwave properties. In particular at GHz frequencies ε = 30.5, Q.f = 62,000, and τf = + 36 ppm/°C.

AB - The synthesis of new families of perovskites with a 1:2 ordered Ba(Zn1/3Ta2/3)O3-type structure was investigated. The compound La(Li1/3Ti2/3) O3 was prepared with a 1:2 ordered arrangement of Li and Ti and is the first reported titanate with this type of structure. A new family of ordered perovskites, (Sr2/3La1/3) (Li1/3Ta2/3)O3 and (Sr2/3La1/3) (Li1/3Nb2/3) O3, were also prepared with a 1:2 layered order of Li+ and B5+ cations. All three compounds exhibit dielectric constants > 25 and Q.f values > 20,000. Studies were also made on the phase stability of Zn-deficient compositions of BZT. The hexagonal perovskite, Ba8ZnTa6O24, was isolated in single-phase form and was found to be the stable phase formed as a result of the loss of ZnO from BZT. Ba8 ZnTa6O24 can be sintered to high density at temperatures considerably lower than pure BZT and exhibits very good microwave properties. In particular at GHz frequencies ε = 30.5, Q.f = 62,000, and τf = + 36 ppm/°C.

KW - Ba(Zn,Ta)O

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KW - Tantalates

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Communicating with wireless perovskites: Cation order and zinc volatilization

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