Defects in scandium doped barium zirconate studied by Sc-45 NMR

Itaru Oikawa; Mariko Ando; Yasuto Noda; Koji Amezawa; Hajime Kiyono; Tadashi Shimizu; Masataka Tansho; Hideki Maekawa

doi:10.1016/j.ssi.2010.04.025

Defects in scandium doped barium zirconate studied by Sc-45 NMR

Itaru Oikawa, Mariko Ando, Yasuto Noda, Koji Amezawa, Hajime Kiyono, Tadashi Shimizu, Masataka Tansho, Hideki Maekawa

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Local structure around Sc in BaZr₁ _- _xSc_xO_{3 - δ} protonic conductor has been investigated by ⁴⁵Sc MAS-NMR. The MAS-NMR spectra were consisted of several peaks, which can be assigned to Sc in different coordination environment. Compositional dependence of the spectrum was observed. The coordination environment of Sc is determined from the peak deconvolution, and the oxygen vacancy concentration and the protonic defect concentration around Sc were obtained. The present investigation suggests that oxygen vacancies preferentially located around Sc and the concentration of oxygen vacancies in the vicinity of Sc increases with increasing the Sc content. Protonic defects were found to be preferentially located around Sc at lower Sc content.

Original language	English
Pages (from-to)	83-87
Number of pages	5
Journal	Solid State Ionics
Volume	192
Issue number	1
DOIs	https://doi.org/10.1016/j.ssi.2010.04.025
Publication status	Published - 2011 Jun 16

Keywords

BaZrO
Defect structure
Magic-angle spinning NMR
Protonic conductor
Sc-45 NMR

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10.1016/j.ssi.2010.04.025

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title = "Defects in scandium doped barium zirconate studied by Sc-45 NMR",

abstract = "Local structure around Sc in BaZr1 - xScxO3 - δ protonic conductor has been investigated by 45Sc MAS-NMR. The MAS-NMR spectra were consisted of several peaks, which can be assigned to Sc in different coordination environment. Compositional dependence of the spectrum was observed. The coordination environment of Sc is determined from the peak deconvolution, and the oxygen vacancy concentration and the protonic defect concentration around Sc were obtained. The present investigation suggests that oxygen vacancies preferentially located around Sc and the concentration of oxygen vacancies in the vicinity of Sc increases with increasing the Sc content. Protonic defects were found to be preferentially located around Sc at lower Sc content.",

keywords = "BaZrO, Defect structure, Magic-angle spinning NMR, Protonic conductor, Sc-45 NMR",

author = "Itaru Oikawa and Mariko Ando and Yasuto Noda and Koji Amezawa and Hajime Kiyono and Tadashi Shimizu and Masataka Tansho and Hideki Maekawa",

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T1 - Defects in scandium doped barium zirconate studied by Sc-45 NMR

AU - Oikawa, Itaru

AU - Ando, Mariko

AU - Noda, Yasuto

AU - Amezawa, Koji

AU - Kiyono, Hajime

AU - Shimizu, Tadashi

AU - Tansho, Masataka

AU - Maekawa, Hideki

PY - 2011/6/16

Y1 - 2011/6/16

N2 - Local structure around Sc in BaZr1 - xScxO3 - δ protonic conductor has been investigated by 45Sc MAS-NMR. The MAS-NMR spectra were consisted of several peaks, which can be assigned to Sc in different coordination environment. Compositional dependence of the spectrum was observed. The coordination environment of Sc is determined from the peak deconvolution, and the oxygen vacancy concentration and the protonic defect concentration around Sc were obtained. The present investigation suggests that oxygen vacancies preferentially located around Sc and the concentration of oxygen vacancies in the vicinity of Sc increases with increasing the Sc content. Protonic defects were found to be preferentially located around Sc at lower Sc content.

AB - Local structure around Sc in BaZr1 - xScxO3 - δ protonic conductor has been investigated by 45Sc MAS-NMR. The MAS-NMR spectra were consisted of several peaks, which can be assigned to Sc in different coordination environment. Compositional dependence of the spectrum was observed. The coordination environment of Sc is determined from the peak deconvolution, and the oxygen vacancy concentration and the protonic defect concentration around Sc were obtained. The present investigation suggests that oxygen vacancies preferentially located around Sc and the concentration of oxygen vacancies in the vicinity of Sc increases with increasing the Sc content. Protonic defects were found to be preferentially located around Sc at lower Sc content.

KW - BaZrO

KW - Defect structure

KW - Magic-angle spinning NMR

KW - Protonic conductor

KW - Sc-45 NMR

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Defects in scandium doped barium zirconate studied by Sc-45 NMR

Abstract

Keywords

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