Crystal growth and thermodynamic investigation of Bi2M2+O4 (M = Pd, Cu). Issue 17 (15th April 2021)

• Record Type: Journal Article
• Authors: Wolff, Nora; Klimm, Detlef; Habicht, Klaus; Fritsch, Katharina
• Is Part Of: CrystEngComm. Volume 23:Issue 17(2021)
• Page Start: 3230
• Page End: 3238
• Publication Date: 2021-04-15
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d1ce00220a
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : The work establishes a connection between the thermodynamics and crystal growth of Bi2 M 2+ O4 and reveals new insights into the description and understanding of the growth process and its optimization. Abstract : Phase equilibria that are relevant for the growth of Bi2 MO4 have been studied experimentally, and the ternary phase diagrams of Bi2 O3 –PdO2 –Pd and Bi2 O3 –Cu2 O–CuO and its isopleth section Bi2 O3 –CuO were redetermined. It is shown that every melting and crystallization process is always accompanied by a redox process at the phase boundary and that for both title compounds, the valence of the transition metal is lowered during melting. Vice versa, during crystal growth, O2 must be transported through the melt to the phase boundary. Based on these new insights provided by our thermodynamic studies, Bi2 CuO4 single crystals with a length of up to 7 cm and a diameter of 6 mm were grown by the OFZ technique to be used for investigations of magnetic, electronic and thermal transport properties. The grown crystals were characterized by powder X-ray diffraction, Laue, magnetization and specific heat measurements.