Crystallisation of phosphates revisited: a multi-step formation process for SrHPO4
Author:
Ruiz Arana Laura1, Ströh Jonas1, Amtsfeld Jasper1, Doungmo Giscard1, Novikov Dmitri2, Khadiev Azat2, Etter Martin2, Wharmby Michael2, Suta Markus3, Terraschke Huayna14
Affiliation:
1. Institut für Anorgansiche Chemie, Christian-Albrechts-Universität zu Kiel , Max-Eyth-Straße 2, 24118 Kiel , Germany 2. Deutsches Elektronen-Synchrotron (DESY), FS-PETRA-D , Notkestraße 85, 22607 Hamburg , Germany 3. Inorganic Photoactive Materials, Institute of Inorganic Chemistry, Heinrich Heine University Düsseldorf , Universitätsstraße 1, 40225 , Düsseldorf , Germany 4. Kiel Nano, Surface and Interface Science (KINSIS), Christian-Albrechts-Universität zu Kiel, Christian-Albrechts-Platz 4 , 24118 Kiel , Germany
Abstract
Abstract
SrHPO4 is used in a multitude of applications, including biomedicine, catalysts, luminescent materials, and batteries. However, the performance of these materials depends on the ability to control the formation and transformation of strontium phosphates. This work focuses on the application of in situ and ex situ measurements, including synchrotron-based X-ray diffraction (XRD) analysis, luminescence of Ce3+ and Eu3+ dopants, light transmission, reflectance, and thermogravimetry to track structural changes in SrHPO4 under different experimental conditions. Ex situ analysis of aliquots revealed favourable crystallisation of β-SrHPO4 through the formation of Sr6H3(PO4)5·2H2O as an intermediate. Furthermore, in situ analysis showed that the reaction mechanism evolves via the initial formation of amorphous strontium phosphate and Sr5(PO4)3OH, which subsequently transforms to γ-SrHPO4. Analysis of the luminescence properties of the lanthanide dopants provided insights into the coordination environments of the substituted Sr2+ sites.
Publisher
Walter de Gruyter GmbH
Subject
General Chemistry
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