University of Oulu

Bai, Y., Xiang, H., Jantunen, H., & Juuti, J. (2019). Multi-functional perovskites – an investigation of compositional and processing influence on microstructure, dielectric and ferroelectric properties. The European Physical Journal Special Topics, 228(7), 1555–1573.

Multi-functional perovskites : an investigation of compositional and processing influence on microstructure, dielectric and ferroelectric properties

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Author: Bai, Yang1; Xiang, Huaicheng1,2; Jantunen, Heli1;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
2Ministry-province jointly-constructed cultivation base for state key laboratory of processing for non-ferrous metal and featured materials, Key laboratory of new processing technology for non-ferrous metal and materials ministry of education, College of Materials Science and Engineering, Guilin University of Technology, Guilin, P.R. China
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4.2 MB)
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Language: English
Published: Springer Nature, 2019
Publish Date: 2019-09-23


Ba(Ni0.5Nb0.5)O2.75 (BNNO) doped KNbO3 (KN) and (K0.5Na0.5)NbO3 (KNN), abbreviated as KBNNO and KNBNNO, respectively, have been recently reported to co-exhibit narrow band gaps (visible range) and strong piezoelectric/pyroelectric effects simultaneously within the same material. This had never been achieved in a single ceramic material. Such a breakthrough may allure the development of fundamentally novel multi-source energy harvesters based on only one piece of material as well as advanced optoelectronic devices with multiple functions. It has been found that the window of getting the unique combination of these properties is very narrow. Even a slight shifting away from the stoichiometry of the compositions may induce a significant loss of the properties. The reasons are expected to be in the compositions and microstructure of these materials. However, detailed information — e.g. the correlation of the compositions, processing conditions, microstructure and properties — remains to be investigated for such novel materials. In this paper, the inter-influence of different doping amounts of BNNO, calcination and sintering temperatures, phase structures and defects (potassium loss and oxygen vacancy) on the dielectric and ferroelectric properties are studied. The paper reveals the principles and provides guidance to achieving good ferroelectric properties in these emerging perovskite structured materials.

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Series: The European physical journal. Special topics
ISSN: 1951-6355
ISSN-E: 1951-6401
ISSN-L: 1951-6355
Volume: 228
Issue: 7
Pages: 1555 - 1573
DOI: 10.1140/epjst/e2019-800132-8
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: Open access funding provided by the University of Oulu, Finland. This work has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement number 705437. Author J.J. acknowledges the funding of the Academy of Finland (project numbers 267573, 273663 and 298409). Author H. Xiang appreciates the financial support from the Natural Science Foundation of China (Nos. 51502047, 21561008, and 21761008), the Natural Science Foundation of Guangxi Zhuang Autonomous Region (Nos. 2015GXNSFFA139003, 2016GXNSFBA380134, and 2016GXNS-FAA380018), Project of Scientific Research and Technical Exploitation Program of Guilin (Nos. 2016010702-2 and 20170225).
Academy of Finland Grant Number: 267573
Detailed Information: 267573 (Academy of Finland Funding decision)
273663 (Academy of Finland Funding decision)
298409 (Academy of Finland Funding decision)
Copyright information: © The Author(s) 2019. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.