On the excess oxygen in four-layered rock-salt-type units of modulated thermoelectric Bi-Sr-(Co,Rh)-O compounds

Kunio Yubuta; Yuzuru Miyazaki; Ichiro Terasaki; Tsuyoshi Kajitani

doi:10.1007/s11664-009-0705-7

On the excess oxygen in four-layered rock-salt-type units of modulated thermoelectric Bi-Sr-(Co,Rh)-O compounds

Kunio Yubuta, Yuzuru Miyazaki, Ichiro Terasaki, Tsuyoshi Kajitani

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

Abstract

Excess oxygen exists in four-layered rock-salt (RS)-type units of modulated misfit-layered Bi-Sr-(Co,Rh)-O compounds, which consist of interpenetrating CdI ₂-type (Co,Rh)O ₂ and distorted four-layered RS-type block subsystems, which have two b-axes, i.e., b ₁ and b ₂, respectively. From carefully determined chemical contents and misfit ratios, p = b ₁/b ₂, two structural characteristics are concluded, namely, intermixing metal ions in the RS-type layers and excess oxygen δ in, or in the vicinity of, them. The chemical formulae are proposed as [(Bi _1-x (Co,Rh) _x ) ₂(Sr _1-y Bi _y ) ₂O _4+δ ] _p (Co,Rh)O ₂. The valence states of?cobalt and rhodium ions are close to 3.3+. These valence states are quite reasonable for good thermoelectric oxides, such as γ-Na _0.7CoO ₂ and [Ca ₂CoO ₃] _0.62CoO ₂. Excess oxygen would cause the undulated atomic arrangement.

Original language	English
Pages (from-to)	1116-1120
Number of pages	5
Journal	Journal of Electronic Materials
Volume	38
Issue number	7
DOIs	https://doi.org/10.1007/s11664-009-0705-7
Publication status	Published - 2009 Jul 1

Keywords

Chemical composition
Electron diffraction
High-resolution electron microscopy image
Misfit-layered structure
Valence state

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering
Materials Chemistry

Access to Document

10.1007/s11664-009-0705-7

Fingerprint Dive into the research topics of 'On the excess oxygen in four-layered rock-salt-type units of modulated thermoelectric Bi-Sr-(Co,Rh)-O compounds'. Together they form a unique fingerprint.

Cite this

@article{101fcbcd399a497f92a616b855f9d7bc,

title = "On the excess oxygen in four-layered rock-salt-type units of modulated thermoelectric Bi-Sr-(Co,Rh)-O compounds",

abstract = "Excess oxygen exists in four-layered rock-salt (RS)-type units of modulated misfit-layered Bi-Sr-(Co,Rh)-O compounds, which consist of interpenetrating CdI 2-type (Co,Rh)O 2 and distorted four-layered RS-type block subsystems, which have two b-axes, i.e., b 1 and b 2, respectively. From carefully determined chemical contents and misfit ratios, p = b 1/b 2, two structural characteristics are concluded, namely, intermixing metal ions in the RS-type layers and excess oxygen δ in, or in the vicinity of, them. The chemical formulae are proposed as [(Bi 1-x (Co,Rh) x ) 2(Sr 1-y Bi y ) 2O 4+δ ] p (Co,Rh)O 2. The valence states of?cobalt and rhodium ions are close to 3.3+. These valence states are quite reasonable for good thermoelectric oxides, such as γ-Na 0.7CoO 2 and [Ca 2CoO 3] 0.62CoO 2. Excess oxygen would cause the undulated atomic arrangement.",

keywords = "Chemical composition, Electron diffraction, High-resolution electron microscopy image, Misfit-layered structure, Valence state",

author = "Kunio Yubuta and Yuzuru Miyazaki and Ichiro Terasaki and Tsuyoshi Kajitani",

year = "2009",

month = jul,

day = "1",

doi = "10.1007/s11664-009-0705-7",

language = "English",

volume = "38",

pages = "1116--1120",

journal = "Journal of Electronic Materials",

issn = "0361-5235",

publisher = "Springer New York",

number = "7",

}

TY - JOUR

T1 - On the excess oxygen in four-layered rock-salt-type units of modulated thermoelectric Bi-Sr-(Co,Rh)-O compounds

AU - Yubuta, Kunio

AU - Miyazaki, Yuzuru

AU - Terasaki, Ichiro

AU - Kajitani, Tsuyoshi

PY - 2009/7/1

Y1 - 2009/7/1

N2 - Excess oxygen exists in four-layered rock-salt (RS)-type units of modulated misfit-layered Bi-Sr-(Co,Rh)-O compounds, which consist of interpenetrating CdI 2-type (Co,Rh)O 2 and distorted four-layered RS-type block subsystems, which have two b-axes, i.e., b 1 and b 2, respectively. From carefully determined chemical contents and misfit ratios, p = b 1/b 2, two structural characteristics are concluded, namely, intermixing metal ions in the RS-type layers and excess oxygen δ in, or in the vicinity of, them. The chemical formulae are proposed as [(Bi 1-x (Co,Rh) x ) 2(Sr 1-y Bi y ) 2O 4+δ ] p (Co,Rh)O 2. The valence states of?cobalt and rhodium ions are close to 3.3+. These valence states are quite reasonable for good thermoelectric oxides, such as γ-Na 0.7CoO 2 and [Ca 2CoO 3] 0.62CoO 2. Excess oxygen would cause the undulated atomic arrangement.

AB - Excess oxygen exists in four-layered rock-salt (RS)-type units of modulated misfit-layered Bi-Sr-(Co,Rh)-O compounds, which consist of interpenetrating CdI 2-type (Co,Rh)O 2 and distorted four-layered RS-type block subsystems, which have two b-axes, i.e., b 1 and b 2, respectively. From carefully determined chemical contents and misfit ratios, p = b 1/b 2, two structural characteristics are concluded, namely, intermixing metal ions in the RS-type layers and excess oxygen δ in, or in the vicinity of, them. The chemical formulae are proposed as [(Bi 1-x (Co,Rh) x ) 2(Sr 1-y Bi y ) 2O 4+δ ] p (Co,Rh)O 2. The valence states of?cobalt and rhodium ions are close to 3.3+. These valence states are quite reasonable for good thermoelectric oxides, such as γ-Na 0.7CoO 2 and [Ca 2CoO 3] 0.62CoO 2. Excess oxygen would cause the undulated atomic arrangement.

KW - Chemical composition

KW - Electron diffraction

KW - High-resolution electron microscopy image

KW - Misfit-layered structure

KW - Valence state

UR - http://www.scopus.com/inward/record.url?scp=67650488229&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=67650488229&partnerID=8YFLogxK

U2 - 10.1007/s11664-009-0705-7

DO - 10.1007/s11664-009-0705-7

M3 - Article

AN - SCOPUS:67650488229

VL - 38

SP - 1116

EP - 1120

JO - Journal of Electronic Materials

JF - Journal of Electronic Materials

SN - 0361-5235

IS - 7

ER -