Synthesis and structures of carrier doped titanates with the Ruddlesden-Popper structure (Sr0.95La0.05)n+1TinO3n+1 (n = 1, 2)

Wataru Sugimoto; Masashi Shirata; Masataka Takemoto; Shuhei Hayami; Yoshiyuki Sugahara; Kazuyuki Kuroda

doi:10.1016/s0167-2738(98)00056-3

Synthesis and structures of carrier doped titanates with the Ruddlesden-Popper structure (Sr_0.95La_0.05)_n+1Ti_nO_3n+1 (n = 1, 2)

Wataru Sugimoto, Masashi Shirata, Masataka Takemoto, Shuhei Hayami, Yoshiyuki Sugahara, Kazuyuki Kuroda^*

^*Corresponding author for this work

School of Advanced Science and Engineering

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

16 Citations (Scopus)

Abstract

Carrier doping in Sr_n+1Ti_nO_3n+1 (n = 1, 2) was conducted by the substitution of La for Sr and the simultaneous introduction of oxygen vacancies. Single-phase products of (Sr_0.95La_0.05)_n+1Ti_nO _3n+1-δ (n = 1, δ = 0.05; n =2, δ = 0.125) were synthesized by the solid-state reaction of Sr₂TiO₄ (or Sr₃Ti₂O₇), La₂O₃ and Ti. When TiO₂ was used as one of the starting compounds to maintain oxygen stoichiometry, compounds with higher n were observed besides the object phases. Structural refinement by Rietveld analysis revealed that the a-axis expands while the c-axis contracts with La doping. The contraction of the c-axis is attributed to a shortened (Sr,La)-O distance, since the TiO₆ octahedra elongated in both a and c directions with doping. The change in the structure is discussed on the basis of the size of the substituting ion. The resistivity of the single-phase products was semiconducting with a very weak temperature dependence down to 80 K.

Original language	English
Pages (from-to)	315-319
Number of pages	5
Journal	Solid State Ionics
Volume	108
Issue number	1-4
DOIs	https://doi.org/10.1016/s0167-2738(98)00056-3
Publication status	Published - 1998 May 1

Keywords

Electrical properties
Rietveld method
Solid-state reaction
Titanates

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/s0167-2738(98)00056-3

Cite this

@article{e72128abd84241d88875f9c5aa73ec76,

title = "Synthesis and structures of carrier doped titanates with the Ruddlesden-Popper structure (Sr0.95La0.05)n+1TinO3n+1 (n = 1, 2)",

abstract = "Carrier doping in Srn+1TinO3n+1 (n = 1, 2) was conducted by the substitution of La for Sr and the simultaneous introduction of oxygen vacancies. Single-phase products of (Sr0.95La0.05)n+1TinO 3n+1-δ (n = 1, δ = 0.05; n =2, δ = 0.125) were synthesized by the solid-state reaction of Sr2TiO4 (or Sr3Ti2O7), La2O3 and Ti. When TiO2 was used as one of the starting compounds to maintain oxygen stoichiometry, compounds with higher n were observed besides the object phases. Structural refinement by Rietveld analysis revealed that the a-axis expands while the c-axis contracts with La doping. The contraction of the c-axis is attributed to a shortened (Sr,La)-O distance, since the TiO6 octahedra elongated in both a and c directions with doping. The change in the structure is discussed on the basis of the size of the substituting ion. The resistivity of the single-phase products was semiconducting with a very weak temperature dependence down to 80 K.",

keywords = "Electrical properties, Rietveld method, Solid-state reaction, Titanates",

author = "Wataru Sugimoto and Masashi Shirata and Masataka Takemoto and Shuhei Hayami and Yoshiyuki Sugahara and Kazuyuki Kuroda",

note = "Funding Information: One of the authors (Y.S.) thanks the Advanced Research Center for Science and Engineering, Waseda University, for financial support. This work was financially supported, in part, by a Grant-in-Aid for JSPS Fellows (No. 5727) from the Ministry of Education, Science, Sports, and Culture.",

year = "1998",

month = may,

day = "1",

doi = "10.1016/s0167-2738(98)00056-3",

language = "English",

volume = "108",

pages = "315--319",

journal = "Solid State Ionics",

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TY - JOUR

T1 - Synthesis and structures of carrier doped titanates with the Ruddlesden-Popper structure (Sr0.95La0.05)n+1TinO3n+1 (n = 1, 2)

AU - Sugimoto, Wataru

AU - Shirata, Masashi

AU - Takemoto, Masataka

AU - Hayami, Shuhei

AU - Sugahara, Yoshiyuki

AU - Kuroda, Kazuyuki

N1 - Funding Information: One of the authors (Y.S.) thanks the Advanced Research Center for Science and Engineering, Waseda University, for financial support. This work was financially supported, in part, by a Grant-in-Aid for JSPS Fellows (No. 5727) from the Ministry of Education, Science, Sports, and Culture.

PY - 1998/5/1

Y1 - 1998/5/1

N2 - Carrier doping in Srn+1TinO3n+1 (n = 1, 2) was conducted by the substitution of La for Sr and the simultaneous introduction of oxygen vacancies. Single-phase products of (Sr0.95La0.05)n+1TinO 3n+1-δ (n = 1, δ = 0.05; n =2, δ = 0.125) were synthesized by the solid-state reaction of Sr2TiO4 (or Sr3Ti2O7), La2O3 and Ti. When TiO2 was used as one of the starting compounds to maintain oxygen stoichiometry, compounds with higher n were observed besides the object phases. Structural refinement by Rietveld analysis revealed that the a-axis expands while the c-axis contracts with La doping. The contraction of the c-axis is attributed to a shortened (Sr,La)-O distance, since the TiO6 octahedra elongated in both a and c directions with doping. The change in the structure is discussed on the basis of the size of the substituting ion. The resistivity of the single-phase products was semiconducting with a very weak temperature dependence down to 80 K.

AB - Carrier doping in Srn+1TinO3n+1 (n = 1, 2) was conducted by the substitution of La for Sr and the simultaneous introduction of oxygen vacancies. Single-phase products of (Sr0.95La0.05)n+1TinO 3n+1-δ (n = 1, δ = 0.05; n =2, δ = 0.125) were synthesized by the solid-state reaction of Sr2TiO4 (or Sr3Ti2O7), La2O3 and Ti. When TiO2 was used as one of the starting compounds to maintain oxygen stoichiometry, compounds with higher n were observed besides the object phases. Structural refinement by Rietveld analysis revealed that the a-axis expands while the c-axis contracts with La doping. The contraction of the c-axis is attributed to a shortened (Sr,La)-O distance, since the TiO6 octahedra elongated in both a and c directions with doping. The change in the structure is discussed on the basis of the size of the substituting ion. The resistivity of the single-phase products was semiconducting with a very weak temperature dependence down to 80 K.

KW - Electrical properties

KW - Rietveld method

KW - Solid-state reaction

KW - Titanates

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