Centrosymmetric to non-centrosymmetric transition in the Ca2−xMnxTi2O6 double perovskite system studied through structural analysis and dielectric properties

Elisabeth K. Albrecht, Tuomo Siponkoski, Eeva-Leena Rautama, Maarit Karppinen, Antti J. Karttunen*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

We have used high-pressure synthesis to synthesize samples of Ca2−xMnxTi2O6 double perovskite, where x varies between 0.2 and 1. The synthesized materials were structurally characterized with powder X-ray diffraction (XRD). Rietveld refinement of the XRD patterns was used to study the change from CaTiO3 (x = 0) to the composition CaMnTi2O6 (x = 1) where half of the Ca(ii) ions are replaced by smaller Mn(ii) ions. We analyzed the peak shapes in the XRD patterns, as well as lattice parameters, and it appears that smooth symmetry change from the centrosymmetric space group Pbnm to the non-centrosymmetric space group P42mc occurs between x = 0.3 and x = 0.5. We also confirmed the centrosymmetric to non-centrosymmetric transition by characterizing the dielectric properties of the materials with ferroelectric measurements.

Original languageEnglish
Pages (from-to)6282-6288
JournalDalton Transactions
Volume53
Issue number14
Early online date11 Mar 2024
DOIs
Publication statusPublished - 14 Apr 2024
MoE publication typeA1 Journal article-refereed

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