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Effects of Nanodomains on Local and Long-Range Phase Transitions in Perovskite-Type Eu0.8Ca0.2TiO3–δ

Widenmeyer, Marc ; Checchia, Stefano ; Xiao, Xingxing ; Scavini, Marco ; Weidenkaff, Anke (2020)
Effects of Nanodomains on Local and Long-Range Phase Transitions in Perovskite-Type Eu0.8Ca0.2TiO3–δ.
In: Nanomaterials, 2020, 10 (4)
doi: 10.25534/tuprints-00013377
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Effects of Nanodomains on Local and Long-Range Phase Transitions in Perovskite-Type Eu0.8Ca0.2TiO3–δ
Language: English
Date: 26 August 2020
Place of Publication: Darmstadt
Year of primary publication: 2020
Publisher: MDPI
Journal or Publication Title: Nanomaterials
Volume of the journal: 10
Issue Number: 4
DOI: 10.25534/tuprints-00013377
Corresponding Links:
Origin: Secondary publication via sponsored Golden Open Access
Abstract:

The determination of reversible phase transitions in the perovskite-type thermoelectric oxide Eu0.8Ca0.2TiO3–δ is fundamental, since structural changes largely affect the thermal and electrical transport properties. The phase transitions were characterized by heat capacity measurements, Rietveld refinements, and pair distribution function (PDF) analysis of the diffraction data to achieve information on the phase transition temperatures and order as well as structural changes on the local level and the long range. On the long-range scale, Eu0.8Ca0.2TiO3–δ showed a phase transition sequence during heating from cubic at 100 < T < 592 K to tetragonal and finally back to cubic at T > 846 K. The phase transition at T = 592 K (diffraction)/606 K (thermal analysis) was reversible with a very small thermal hysteresis of about 2 K. The local structure at 100 K was composed of a complex nanodomain arrangement of Amm2- and Pbnm-like local structures with different coherence lengths. Since in Eu0.8Ca0.2TiO3–δ the amount of Pbnm domains was too small to percolate, the competition of ferroelectrically distorted octahedra (Amm2 as in BaTiO3) and rigid, tilted octahedra (Pbnm as in CaTiO3) resulted in a cubic long-range structure at low temperatures.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-133772
Additional Information:

This article belongs to the Special Issue Synchrotron Radiation Techniques for the Investigation of Nanomaterials.

Classification DDC: 600 Technology, medicine, applied sciences > 600 Technology
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Materials and Resources
Date Deposited: 26 Aug 2020 13:41
Last Modified: 07 Aug 2024 11:38
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/13377
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