NDLI: Structural and thermoelastic study of the protonic conducting perovskite SrCe$_{0.95}$Yb$_{0.05}$O$

Content Provider	Springer Nature Link
Author	Knight, Kevin S.
Copyright Year	2011
Abstract	The temperature dependence of the crystal structure of the protonic conducting perovskite SrCe$_{0.95}$Yb$_{0.05}$O$_{ξ}$ (ξ ∼ 3) has been determined from Rietveld refinement of neutron time-of-flight powder diffraction data in 25 K steps from 373 K to 1273 K. In contrast to most SrB$^{IV}$O$_{3}$ perovskites which show a sequence of structural phase transitions from Pmcn – Incn – I4/mcm - $$ Pm\overline 3 m $$ with increasing temperature, SrCe$_{0.95}$Yb$_{0.05}$O$_{ξ}$ remains orthorhombic with space group Pmcn from 4.2 K to the highest temperature measured. Crystallographic results are presented graphically in the form of the magnitude of the seven unique symmetry adapted basis vectors of a hypothetical aristotype perovskite phase. Thermoelastic properties of SrCe$_{0.95}$Yb$_{0.05}$O$_{ξ}$ deduced from the temperature variation of the unit cell volume and Debye-Waller factors are compared with literature values derived from independent calorimetric, Raman and elastic measurements. Thermodynamically, SrCe$_{0.95}$Yb$_{0.05}$O$_{ξ}$ behaves as a Debye-like solid with an average Grüneisen parameter in the range 1.4–1.5, but with two characteristic temperatures, ∼200 K and ∼600 K, the lower temperature being more related to the cation vibrations, the higher to the anion vibrations.
Starting Page	143
Ending Page	153
Page Count	11
File Format	PDF
ISSN	13853449
Journal	Journal of Electroceramics
Volume Number	27
Issue Number	3-4
e-ISSN	15738663
Language	English
Publisher	Springer US
Publisher Date	2011-10-20
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	SrCe$_{x}$Yb$_{1-x}$O$_{ξ}$ Crystal structure Symmetry-adapted basis-vector decomposition Thermoelastic properties Electrochemistry Optical and Electronic Materials Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Methods Crystallography
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Materials Chemistry Mechanics of Materials Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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