Study on Growth of Tungsten Bronze Phase from Niobate Perovskite Ceramics in Controlled Atmosphere for Photoferroelectric Applications

Shi X, Bai Y, Wichmann C, Moritz M, Kuhfuß M, Papp C, Khansur NH (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Advanced Electronic Materials Wiley

DOI: 10.1002/aelm.202300601

Abstract

Recent research has found that by introducing A-site deficiency into Ba/Ni co-doped (K,Na)NbO3 ABO3-type perovskite, a beneficial interface for photoferroelectric applications is formed between the perovskite and tungsten bronze (TB) phases. To date, such an interface is formed only spontaneously, and the growth mechanism of the TB phase in the perovskite phase is unclear. This work investigates controlled interface formation using KNBNNO (K0.50Na0.44Ba0.04Ni0.02Nb0.98O2.98) annealed at different temperatures for different durations, and in various atmospheres. Structural, microstructural, and chemical analyses suggest that vacuum, N2, and O2 atmospheres promote the growth of the TB phase from the sample surface, of which the thickness increases with annealing temperature and duration. In contrast, annealing in air does not promote such growth due to lower evaporation of K and Na. Among all atmospheres, the growth starts the earliest, i.e., at 800 °C, in vacuum compared to that as late as 1000 °C in O2. The association of growth of the TB phase with the degree of alkali volatilization that is dependent on the atmosphere, and that with the resultant variation in diffusion rate, uncovers the formation mechanism of the beneficial interface that may also be applicable to other KNN-based materials for advanced photoferroelectric applications.

Authors with CRIS profile

Xi Shi Lehrstuhl für Glas und Keramik Christoph Wichmann Lehrstuhl für Physikalische Chemie II Michael Moritz Lehrstuhl für Physikalische Chemie II Michel Kuhfuß Lehrstuhl für Glas und Keramik Christian Papp Lehrstuhl für Physikalische Chemie II Neamul Hayet Khansur Lehrstuhl für Glas und Keramik

Additional Organisation(s)

Graduiertenkolleg 2495 Energiekonvertierungssysteme: von Materialien zu Bauteilen (Energy Conversion Systems: From Materials to Devices)

Involved external institutions

Oulun Yliopisto / University of Oulo FI Finland (FI)

How to cite

APA:

Shi, X., Bai, Y., Wichmann, C., Moritz, M., Kuhfuß, M., Papp, C., & Khansur, N.H. (2023). Study on Growth of Tungsten Bronze Phase from Niobate Perovskite Ceramics in Controlled Atmosphere for Photoferroelectric Applications. Advanced Electronic Materials. https://doi.org/10.1002/aelm.202300601

MLA:

Shi, Xi, et al. "Study on Growth of Tungsten Bronze Phase from Niobate Perovskite Ceramics in Controlled Atmosphere for Photoferroelectric Applications." Advanced Electronic Materials (2023).

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