Magnesium ion distribution and defect concentrations of MgO-doped lanthanum silicate oxyapatite

Kiyoshi Kobayashi, Tohru Suzuki, Tetsuo Uchikoshi, Yoshio Sakka

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The distribution of magnesium ions at the lanthanum and silicon sites in MgO-doped lanthanum silicate oxyapatite as well as the concentration of neutral lanthanum vacancies were determined using densities and chemical compositions of the doped samples. On the basis of the density data, it was found that magnesium ions are substituted at the silicon site as well as the lanthanum sites in the oxyapatite phase. Owing to the existence of neutral lanthanum vacancies, it was difficult to evaluate the number of the oxygen ions present, which are related to the oxygen ion conductivity of the compound, from the chemical compositions of the samples alone. Further, it was found that the fact that the total conductivity of MgO-doped lanthanum silicate oxyapatite depends on the MgO concentration as well as that of other defects could not be explained on the basis of conventional defect chemistry.

Original languageEnglish
Pages (from-to)24-29
Number of pages6
JournalSolid State Ionics
Volume258
DOIs
Publication statusPublished - 2014 May 1
Externally publishedYes

Fingerprint

Lanthanum
Silicates
ion distribution
lanthanum
Magnesium
magnesium
silicates
Ions
Defects
defects
Silicon
oxygen ions
Vacancies
chemical composition
Oxygen
conductivity
silicon
Chemical analysis
ions
chemistry

Keywords

  • Conductivity
  • Defects
  • Density
  • Lanthanum silicate
  • Oxyapatite

ASJC Scopus subject areas

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

Cite this

Magnesium ion distribution and defect concentrations of MgO-doped lanthanum silicate oxyapatite. / Kobayashi, Kiyoshi; Suzuki, Tohru; Uchikoshi, Tetsuo; Sakka, Yoshio.

In: Solid State Ionics, Vol. 258, 01.05.2014, p. 24-29.

Research output: Contribution to journalArticle

Kobayashi, Kiyoshi ; Suzuki, Tohru ; Uchikoshi, Tetsuo ; Sakka, Yoshio. / Magnesium ion distribution and defect concentrations of MgO-doped lanthanum silicate oxyapatite. In: Solid State Ionics. 2014 ; Vol. 258. pp. 24-29.
@article{6e42e598c6ff4609b9b4b88ad0b9fe24,
title = "Magnesium ion distribution and defect concentrations of MgO-doped lanthanum silicate oxyapatite",
abstract = "The distribution of magnesium ions at the lanthanum and silicon sites in MgO-doped lanthanum silicate oxyapatite as well as the concentration of neutral lanthanum vacancies were determined using densities and chemical compositions of the doped samples. On the basis of the density data, it was found that magnesium ions are substituted at the silicon site as well as the lanthanum sites in the oxyapatite phase. Owing to the existence of neutral lanthanum vacancies, it was difficult to evaluate the number of the oxygen ions present, which are related to the oxygen ion conductivity of the compound, from the chemical compositions of the samples alone. Further, it was found that the fact that the total conductivity of MgO-doped lanthanum silicate oxyapatite depends on the MgO concentration as well as that of other defects could not be explained on the basis of conventional defect chemistry.",
keywords = "Conductivity, Defects, Density, Lanthanum silicate, Oxyapatite",
author = "Kiyoshi Kobayashi and Tohru Suzuki and Tetsuo Uchikoshi and Yoshio Sakka",
year = "2014",
month = "5",
day = "1",
doi = "10.1016/j.ssi.2014.01.015",
language = "English",
volume = "258",
pages = "24--29",
journal = "Solid State Ionics",
issn = "0167-2738",
publisher = "Elsevier",

}

TY - JOUR

T1 - Magnesium ion distribution and defect concentrations of MgO-doped lanthanum silicate oxyapatite

AU - Kobayashi, Kiyoshi

AU - Suzuki, Tohru

AU - Uchikoshi, Tetsuo

AU - Sakka, Yoshio

PY - 2014/5/1

Y1 - 2014/5/1

N2 - The distribution of magnesium ions at the lanthanum and silicon sites in MgO-doped lanthanum silicate oxyapatite as well as the concentration of neutral lanthanum vacancies were determined using densities and chemical compositions of the doped samples. On the basis of the density data, it was found that magnesium ions are substituted at the silicon site as well as the lanthanum sites in the oxyapatite phase. Owing to the existence of neutral lanthanum vacancies, it was difficult to evaluate the number of the oxygen ions present, which are related to the oxygen ion conductivity of the compound, from the chemical compositions of the samples alone. Further, it was found that the fact that the total conductivity of MgO-doped lanthanum silicate oxyapatite depends on the MgO concentration as well as that of other defects could not be explained on the basis of conventional defect chemistry.

AB - The distribution of magnesium ions at the lanthanum and silicon sites in MgO-doped lanthanum silicate oxyapatite as well as the concentration of neutral lanthanum vacancies were determined using densities and chemical compositions of the doped samples. On the basis of the density data, it was found that magnesium ions are substituted at the silicon site as well as the lanthanum sites in the oxyapatite phase. Owing to the existence of neutral lanthanum vacancies, it was difficult to evaluate the number of the oxygen ions present, which are related to the oxygen ion conductivity of the compound, from the chemical compositions of the samples alone. Further, it was found that the fact that the total conductivity of MgO-doped lanthanum silicate oxyapatite depends on the MgO concentration as well as that of other defects could not be explained on the basis of conventional defect chemistry.

KW - Conductivity

KW - Defects

KW - Density

KW - Lanthanum silicate

KW - Oxyapatite

UR - http://www.scopus.com/inward/record.url?scp=84894454251&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84894454251&partnerID=8YFLogxK

U2 - 10.1016/j.ssi.2014.01.015

DO - 10.1016/j.ssi.2014.01.015

M3 - Article

VL - 258

SP - 24

EP - 29

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

ER -