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Dielectric measurements on a novel Ba1 - xCaxTiO3 (BCT) bulk ceramic combinatorial library

Dielectric measurements on a novel Ba1 - xCaxTiO3 (BCT) bulk ceramic combinatorial library
Dielectric measurements on a novel Ba1 - xCaxTiO3 (BCT) bulk ceramic combinatorial library
High-throughput combinatorial methods have the potential to discover new materials. They can investigate the effects of a wide range of dopants on the dielectric properties to optimize existing systems, encouraging the short innovation cycles that industry requires. We are currently part of a consortium of London Universities exploring methods of producing and measuring combinatorial libraries of microwave dielectric ceramics. The London University Search Instrument (LUSI) is a fully automated, high-throughput combinatorial robot that has the potential capability to produce combinatorial libraries consisting of large numbers of sintered bulk ceramic samples with varying composition, on alumna substrates. We have reported the manufacture and characterisation of Ba x Sr1???x TiO3 libraries (x in steps of 0.1) as a proof of concept to demonstrate that the robot works and to confirm a compositional and functional change throughout the libraries, as well as proving that reliable measurements can be made on such small samples. Libraries of Ba1???x Ca x TiO3 samples were made with varying compositions of x?=?0–1 in steps of 0.1, and fired to 1400 °C for 1 h, by LUSI. X-ray diffraction (XRD) data agreed with the few previous reports on this little-studied system, namely that after initially forming a solid solution with Ca addition, above x?=?0.2 a two phase system forms with values of 0.2?<?x?<?0.9, after which a single phase system again appears with values of x?=?0.9 and higher. Dielectric measurements (100 Hz–1 MHz) showed a previously reported unusual initial increase in the Curie point with substitution up to x?=?0.2, followed by a rapid decrease to below 125 K when x?>?0.4. This initial increase has been attributed to the Ca substituting in both the Ba2+ A sites and the Ti4+ B sites of the perovskite up to x?=?0.2, after which T c decreases greatly as the two phase system forms. Scanning probe microscopy and piezo response force microscopy (PFM) experiments also showed evidence of an increase in piezoelectricity with small amounts of x (0.1–0.2), followed by a decrease with increasing x.
combinatorial, high-throughput, dielectric, ferroelectric
1385-3449
245-251
Pullar, Robert C.
eb861cfb-a56c-4a02-9156-f6b469e232fe
Zhang, Yong
a398822e-74d7-424e-8efc-bf8307927312
Chen, Lifeng
5e67c8cc-4317-4ceb-9d78-74cbc4beb8cd
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Evans, Julian R.G.
4eee463a-4dd3-4ef2-b9bc-784246b68ad2
Salak, Andrei N.
d413366b-bd71-4050-b26d-71d7438ca1a4
Kiselev, Dmitry A.
cdb7943c-064c-409f-952e-50e5aba498cf
Kholkin, Andrei L.
6fa6219b-9dd7-4497-8b83-473ee43ff364
Ferreira, Victor M.
b5769ef1-0b1c-472e-9949-cbbb32fa0692
Alford, Neil McN.
952831a8-1504-420d-a05a-85374f02a287
Pullar, Robert C.
eb861cfb-a56c-4a02-9156-f6b469e232fe
Zhang, Yong
a398822e-74d7-424e-8efc-bf8307927312
Chen, Lifeng
5e67c8cc-4317-4ceb-9d78-74cbc4beb8cd
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Evans, Julian R.G.
4eee463a-4dd3-4ef2-b9bc-784246b68ad2
Salak, Andrei N.
d413366b-bd71-4050-b26d-71d7438ca1a4
Kiselev, Dmitry A.
cdb7943c-064c-409f-952e-50e5aba498cf
Kholkin, Andrei L.
6fa6219b-9dd7-4497-8b83-473ee43ff364
Ferreira, Victor M.
b5769ef1-0b1c-472e-9949-cbbb32fa0692
Alford, Neil McN.
952831a8-1504-420d-a05a-85374f02a287

Pullar, Robert C., Zhang, Yong, Chen, Lifeng, Yang, Shoufeng, Evans, Julian R.G., Salak, Andrei N., Kiselev, Dmitry A., Kholkin, Andrei L., Ferreira, Victor M. and Alford, Neil McN. (2009) Dielectric measurements on a novel Ba1 - xCaxTiO3 (BCT) bulk ceramic combinatorial library. [in special issue: International Conference on Electroceramics] Journal of Electroceramics, 22 (1-3), 245-251. (doi:10.1007/s10832-008-9430-5).

Record type: Article

Abstract

High-throughput combinatorial methods have the potential to discover new materials. They can investigate the effects of a wide range of dopants on the dielectric properties to optimize existing systems, encouraging the short innovation cycles that industry requires. We are currently part of a consortium of London Universities exploring methods of producing and measuring combinatorial libraries of microwave dielectric ceramics. The London University Search Instrument (LUSI) is a fully automated, high-throughput combinatorial robot that has the potential capability to produce combinatorial libraries consisting of large numbers of sintered bulk ceramic samples with varying composition, on alumna substrates. We have reported the manufacture and characterisation of Ba x Sr1???x TiO3 libraries (x in steps of 0.1) as a proof of concept to demonstrate that the robot works and to confirm a compositional and functional change throughout the libraries, as well as proving that reliable measurements can be made on such small samples. Libraries of Ba1???x Ca x TiO3 samples were made with varying compositions of x?=?0–1 in steps of 0.1, and fired to 1400 °C for 1 h, by LUSI. X-ray diffraction (XRD) data agreed with the few previous reports on this little-studied system, namely that after initially forming a solid solution with Ca addition, above x?=?0.2 a two phase system forms with values of 0.2?<?x?<?0.9, after which a single phase system again appears with values of x?=?0.9 and higher. Dielectric measurements (100 Hz–1 MHz) showed a previously reported unusual initial increase in the Curie point with substitution up to x?=?0.2, followed by a rapid decrease to below 125 K when x?>?0.4. This initial increase has been attributed to the Ca substituting in both the Ba2+ A sites and the Ti4+ B sites of the perovskite up to x?=?0.2, after which T c decreases greatly as the two phase system forms. Scanning probe microscopy and piezo response force microscopy (PFM) experiments also showed evidence of an increase in piezoelectricity with small amounts of x (0.1–0.2), followed by a decrease with increasing x.

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More information

Published date: 1 February 2009
Keywords: combinatorial, high-throughput, dielectric, ferroelectric
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 165003
URI: https://eprints.soton.ac.uk/id/eprint/165003
ISSN: 1385-3449
PURE UUID: 73cbb267-f49e-4b61-98ce-032da747301e
ORCID for Shoufeng Yang: ORCID iD orcid.org/0000-0002-3888-3211

Catalogue record

Date deposited: 07 Oct 2010 10:53
Last modified: 06 Jun 2018 12:33

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