Work

Mechanochemical synthesis and transformation of the polymorphic double carbonates fairchildite and buetschliite, (K 2 Ca(CO 3 ) 2 ): an in situ X-ray powder diffraction study

Year: 2024

Type: article

Abstract: using a shaker mill. Unlike previous methods requiring high temperatures and prolonged heating, fairchildite, a high-temperature polymorph, is formed initially in all experiments, adhering to Ostwald's rule of stages. Notably, the transformation to the stable buetschliite phase can be achieved by varying milling parameters, particularly frequency and moisture content. The results suggest that pressure, rather than temperature, plays a significant role in this phase transition, with moisture further accelerating the transformation. These findings offer a new, efficient route for the synthesis of these polymorphs, highlighting the critical influence of milling conditions on the reaction pathway.

Source: RSC Mechanochemistry

DOI: 10.1039/d4mr00093e

Authors: Volker Kahlenberg, Doris E. Braun, Wolfgang Schmidt, Hang Liu, Sebastian Leiting, Claudia Weidenthaler

Institutions: Universität Innsbruck, Max-Planck-Institut für Kohlenforschung

Language: English

Topic: Crystallization and Solubility Studies

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: diamond

Funders: Austrian Science Fund, Deutsches Elektronen-Synchrotron

Awards: Thermochemistry of the system K2O-CaO-SiO2, G6859883878