On the structural phase transitions and optical properties of Sr2Sr1-xCaxTeO6 (0 ≤ x ≤ 1) ceramics

• Published in: Journal of electroceramics 2021-02, Vol.46 (1), p.1-13
• Main Authors: Tamraoui, Y., El Bachraoui, F., Mirinioui, F., Louihi, S., Alami, J., Saadoune, I., El hachmi, A., Lazor, P., Manoun, B.
• Format: Article
• Language: English
• Subjects: Calcium; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Composition effects; Crystal structure; Crystallography and Scattering Methods; Cut off wavelength; Double perovskite; Electrical properties; Electrochemistry; Energy gap; Glass; Inorganic compounds; Materials Science; Natural Materials; Optical and Electronic Materials; Optical band gap; Optical properties; Perovskites; Phase transition; Phase transitions; Raman spectroscopy; Room temperature; X-ray diffraction
• ISSN: 1385-3449; 1573-8663; 1573-8663
• DOI: 10.1007/s10832-021-00237-8

A series of double-perovskite oxides Sr 2 Sr 1-x Ca x TeO 6 (0 ≤ x ≤ 1) samples have been prepared in order to study the effect of composition on phase formation and the related optical properties. The objective of this work is to study the possibility of calcium insertion with different percentages since calcium in known to enhance the electrical properties. In this work a well detailed structure and phase transitions investigation of the compounds were conducted and probed by X-ray diffraction and Raman spectroscopy techniques at room temperature. Both Rietveld refinements and Raman studies revealed that two phase transitions took place as the calcium amount x increases; a first from a triclinic to a hexagonal in the range 0.1