Identification of ultradilute dopants in ceramics

Isao Tanaka, Teruyasu Mizoguchi, Masafumi Matsui, Satoru Yoshioka, Hirohiko Adachi, Tomoyuki Yamamoto, Toshihiro Okajima, Masanori Umesaki, Wai Yim Ching, Yoshiyuki Inoue, Masataka Mizuno, Hideki Araki, Yasuharu Shirai

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

The properties of ceramic materials are strongly influenced by the presence of ultradilute impurities (dopants). Near-edge X-ray absorption fine structure (NEXAFS) measurements using third-generation synchotron sources can be used to identify ultradilute dopants, provided that a good theoretical tool is available to interpret the spectra. Here, we use NEXAFS analysis and first-principles calculations to study the local environments of Ga dopants at levels of 10 p.p.m in otherwise high-purity MgO. This analysis suggests that the extra charge associated with substitutional Ga on a Mg site is compensated by the formation of a Mg vacancy. This defect model is then confirmed by positron lifetime measurements and planewave pseudopotential calculations. This powerful combination of techniques should provide a general method of identifying the defect states of ultradilute dopants in ceramics.

Original languageEnglish
Pages (from-to)541-545
Number of pages5
JournalNature Materials
Volume2
Issue number8
DOIs
Publication statusPublished - 2003 Aug
Externally publishedYes

Fingerprint

fine structure
Doping (additives)
ceramics
defects
X ray absorption
pseudopotentials
positrons
purity
x rays
life (durability)
impurities
Defects
Positrons
Ceramic materials
Vacancies
Impurities

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Tanaka, I., Mizoguchi, T., Matsui, M., Yoshioka, S., Adachi, H., Yamamoto, T., ... Shirai, Y. (2003). Identification of ultradilute dopants in ceramics. Nature Materials, 2(8), 541-545. https://doi.org/10.1038/nmat939

Identification of ultradilute dopants in ceramics. / Tanaka, Isao; Mizoguchi, Teruyasu; Matsui, Masafumi; Yoshioka, Satoru; Adachi, Hirohiko; Yamamoto, Tomoyuki; Okajima, Toshihiro; Umesaki, Masanori; Ching, Wai Yim; Inoue, Yoshiyuki; Mizuno, Masataka; Araki, Hideki; Shirai, Yasuharu.

In: Nature Materials, Vol. 2, No. 8, 08.2003, p. 541-545.

Research output: Contribution to journalArticle

Tanaka, I, Mizoguchi, T, Matsui, M, Yoshioka, S, Adachi, H, Yamamoto, T, Okajima, T, Umesaki, M, Ching, WY, Inoue, Y, Mizuno, M, Araki, H & Shirai, Y 2003, 'Identification of ultradilute dopants in ceramics', Nature Materials, vol. 2, no. 8, pp. 541-545. https://doi.org/10.1038/nmat939
Tanaka I, Mizoguchi T, Matsui M, Yoshioka S, Adachi H, Yamamoto T et al. Identification of ultradilute dopants in ceramics. Nature Materials. 2003 Aug;2(8):541-545. https://doi.org/10.1038/nmat939
Tanaka, Isao ; Mizoguchi, Teruyasu ; Matsui, Masafumi ; Yoshioka, Satoru ; Adachi, Hirohiko ; Yamamoto, Tomoyuki ; Okajima, Toshihiro ; Umesaki, Masanori ; Ching, Wai Yim ; Inoue, Yoshiyuki ; Mizuno, Masataka ; Araki, Hideki ; Shirai, Yasuharu. / Identification of ultradilute dopants in ceramics. In: Nature Materials. 2003 ; Vol. 2, No. 8. pp. 541-545.
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