Cation distribution and structural instability in Bi4-xLaxTi3O12

Minoru Osada, Masaru Tada, Masato Kakihana, Takayuki Watanabe, Hiroshi Funakubo

Research output: Contribution to journalArticle

142 Citations (Scopus)

Abstract

Raman spectra of Bi4-xLaxTi3O12 have been investigated. For an increasing degree of La doping, we find a substantial hardening of the vibration involving Bi atoms at the perovskite A site, whereas the Bi mode at the Bi2O2 layer is negligibly changed. From a comparison with a simple mass consideration, we identify a precise cation distribution, which indicates a pronounced site selectivity of La ions for the A site for x < ∼ 1. At room temperature, the lowest mode at 28 cm-1 shows a significant softening with La doping. This behaviour resembles the temperature dependence in the nondoped material (at constant composition). A remarkable correlation is found between the soft-mode frequency and TC for Bi4-xLaxTi3O12. We suggest that this correlation, as well as the soft-mode frequency for substituted materials, offers useful guidelines for designing materials in a controlled manner.

Original languageEnglish
Pages (from-to)5572-5575
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume40
Issue number9 B
Publication statusPublished - 2001 Sep
Externally publishedYes

Fingerprint

Positive ions
cations
Doping (additives)
Perovskite
Hardening
Raman scattering
hardening
softening
Atoms
Temperature
selectivity
Ions
Raman spectra
Chemical analysis
vibration
temperature dependence
room temperature
atoms
ions

Keywords

  • BiLaTiO
  • Cation distribution
  • Phase transition
  • Raman scattering
  • Soft mode

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Cation distribution and structural instability in Bi4-xLaxTi3O12. / Osada, Minoru; Tada, Masaru; Kakihana, Masato; Watanabe, Takayuki; Funakubo, Hiroshi.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 40, No. 9 B, 09.2001, p. 5572-5575.

Research output: Contribution to journalArticle

Osada, Minoru ; Tada, Masaru ; Kakihana, Masato ; Watanabe, Takayuki ; Funakubo, Hiroshi. / Cation distribution and structural instability in Bi4-xLaxTi3O12. In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 2001 ; Vol. 40, No. 9 B. pp. 5572-5575.
@article{adff2293b4d14cbd9a9b2b969bb8b746,
title = "Cation distribution and structural instability in Bi4-xLaxTi3O12",
abstract = "Raman spectra of Bi4-xLaxTi3O12 have been investigated. For an increasing degree of La doping, we find a substantial hardening of the vibration involving Bi atoms at the perovskite A site, whereas the Bi mode at the Bi2O2 layer is negligibly changed. From a comparison with a simple mass consideration, we identify a precise cation distribution, which indicates a pronounced site selectivity of La ions for the A site for x < ∼ 1. At room temperature, the lowest mode at 28 cm-1 shows a significant softening with La doping. This behaviour resembles the temperature dependence in the nondoped material (at constant composition). A remarkable correlation is found between the soft-mode frequency and TC for Bi4-xLaxTi3O12. We suggest that this correlation, as well as the soft-mode frequency for substituted materials, offers useful guidelines for designing materials in a controlled manner.",
keywords = "BiLaTiO, Cation distribution, Phase transition, Raman scattering, Soft mode",
author = "Minoru Osada and Masaru Tada and Masato Kakihana and Takayuki Watanabe and Hiroshi Funakubo",
year = "2001",
month = "9",
language = "English",
volume = "40",
pages = "5572--5575",
journal = "Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes",
issn = "0021-4922",
publisher = "Japan Society of Applied Physics",
number = "9 B",

}

TY - JOUR

T1 - Cation distribution and structural instability in Bi4-xLaxTi3O12

AU - Osada, Minoru

AU - Tada, Masaru

AU - Kakihana, Masato

AU - Watanabe, Takayuki

AU - Funakubo, Hiroshi

PY - 2001/9

Y1 - 2001/9

N2 - Raman spectra of Bi4-xLaxTi3O12 have been investigated. For an increasing degree of La doping, we find a substantial hardening of the vibration involving Bi atoms at the perovskite A site, whereas the Bi mode at the Bi2O2 layer is negligibly changed. From a comparison with a simple mass consideration, we identify a precise cation distribution, which indicates a pronounced site selectivity of La ions for the A site for x < ∼ 1. At room temperature, the lowest mode at 28 cm-1 shows a significant softening with La doping. This behaviour resembles the temperature dependence in the nondoped material (at constant composition). A remarkable correlation is found between the soft-mode frequency and TC for Bi4-xLaxTi3O12. We suggest that this correlation, as well as the soft-mode frequency for substituted materials, offers useful guidelines for designing materials in a controlled manner.

AB - Raman spectra of Bi4-xLaxTi3O12 have been investigated. For an increasing degree of La doping, we find a substantial hardening of the vibration involving Bi atoms at the perovskite A site, whereas the Bi mode at the Bi2O2 layer is negligibly changed. From a comparison with a simple mass consideration, we identify a precise cation distribution, which indicates a pronounced site selectivity of La ions for the A site for x < ∼ 1. At room temperature, the lowest mode at 28 cm-1 shows a significant softening with La doping. This behaviour resembles the temperature dependence in the nondoped material (at constant composition). A remarkable correlation is found between the soft-mode frequency and TC for Bi4-xLaxTi3O12. We suggest that this correlation, as well as the soft-mode frequency for substituted materials, offers useful guidelines for designing materials in a controlled manner.

KW - BiLaTiO

KW - Cation distribution

KW - Phase transition

KW - Raman scattering

KW - Soft mode

UR - http://www.scopus.com/inward/record.url?scp=0035455304&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035455304&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0035455304

VL - 40

SP - 5572

EP - 5575

JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

SN - 0021-4922

IS - 9 B

ER -