English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

International audienceThe KNb3O8 potassium triniobate phase is a layered compound that shows excellent photocatalytic activity, intercalation properties and electrochemical performances. In this study, we report the synthesis of this niobate in thin film form. Thin films of layered KNb3O8 phase were grown by pulsed laser deposition on (100)-oriented strontium titanate SrTiO3 substrates using targets with different compositions and various deposition parameters. Samples were analyzed by X-ray diffraction, scanning and transmission electron microscopy, X-ray energy dispersive and Rutherford backscattering spectroscopies. This work shows that KNb3O8 films are obtained in a narrow composition range, close to K1.13Nb3O8.7 that can be achieved with several combinations of the elaboration parameters (target composition, deposition temperature, target–substrate distance, laser fluence). Slight potassium amount variations in the film composition lead to the growth of other niobates (i.e. K2Nb8O21, K6Nb10.88O30, K3Nb7O19, K4Nb6O17). The KNb3O8 films are either made of elongated crystals (500 nm long, 50–75 nm wide, and 40 nm thick) or of flat lamellas. In both cases, they are (010)-preferentially oriented with epitaxial relationships with the substrate, namely (010)KNb3O8//(100)SrTiO3, [100]KNb3O8//[010]SrTiO3 and [001]KNb3O8//[001]SrTiO3. Protonation of the KNb3O8 films leads to a complete exchange of K+ ions by H3O+ ions that are themselves exchanged by Sn2+ ions after immersion in a tin chloride solution confirming the exchange reaction capabilities also in thin films. Exchange of K+ by Sn2+ leads to the band gap reduction of 0.33 eV

Epitaxial growth and cationic exchange properties of layered KNb3O8thin films

Epitaxial growth and cationic exchange properties of layered KNb₃O₈thin films