Defect Structure Of Y1-ycaymno3 And La1-ycaymno3. I. Electrical Properties

J. W. Stevenson; M. M. Nasrallah; Harlan U. Anderson; Don M. Sparlin

doi:10.1006/jssc.1993.1020

Defect Structure Of Y1-ycaymno3 And La1-ycaymno3. I. Electrical Properties

J. W. Stevenson
, M. M. Nasrallah
, Harlan U. Anderson
, Don M. Sparlin

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

Abstract

Electrical conductivity and the Seebeck coefficient of compositions in the system Y _1-y Ca _y MnO ₃ and La _1-y Ca _y MnO ₃ were studied to determine the mechanism of electrical transport and defect structure. Electrical conduction appeared to occur via a small polaron hopping mechanism for compositions with 0.30 ≤ y ≤ 0.80. The Seebeck coefficient data did not support the assumption that Mn is present in Cadoped Mn perovskites only in the +3 and +4 valence states. A new defect model was developed which includes the thermally excited disproportion of Mn ³⁺ and Mn ⁴⁺ pairs. The Seebeck data were explained with this model by assuming that divalent Mn cations were site blockers in the conduction process. © 1993 Academic Press, Inc.

Original language	American English
Pages (from-to)	175-184
Number of pages	10
Journal	Journal of Solid State Chemistry
Volume	102
Issue number	1
DOIs	https://doi.org/10.1006/jssc.1993.1020
State	Published - Jan 1 1993

Disciplines

Materials Science and Engineering
Physics

Access to Document

10.1006/jssc.1993.1020License: CC BY

Defect Structure Of Y1-ycaymno3 And La1-ycaymno3Final published version, 405 KBLicense: CC BY

Cite this

@article{b28ab77a299d481c86de304b0d0feb99,

title = "Defect Structure Of Y1-ycaymno3 And La1-ycaymno3. I. Electrical Properties",

abstract = " Electrical conductivity and the Seebeck coefficient of compositions in the system Y 1-y Ca y MnO 3 and La 1-y Ca y MnO 3 were studied to determine the mechanism of electrical transport and defect structure. Electrical conduction appeared to occur via a small polaron hopping mechanism for compositions with 0.30 ≤ y ≤ 0.80. The Seebeck coefficient data did not support the assumption that Mn is present in Cadoped Mn perovskites only in the +3 and +4 valence states. A new defect model was developed which includes the thermally excited disproportion of Mn 3+ and Mn 4+ pairs. The Seebeck data were explained with this model by assuming that divalent Mn cations were site blockers in the conduction process. {\textcopyright} 1993 Academic Press, Inc.",

author = "Stevenson, \{J. W.\} and Nasrallah, \{M. M.\} and Anderson, \{Harlan U.\} and Sparlin, \{Don M.\}",

year = "1993",

month = jan,

day = "1",

doi = "10.1006/jssc.1993.1020",

language = "American English",

volume = "102",

pages = "175--184",

journal = "Journal of Solid State Chemistry",

issn = "1095-726X",

number = "1",

}

TY - JOUR

T1 - Defect Structure Of Y1-ycaymno3 And La1-ycaymno3. I. Electrical Properties

AU - Stevenson, J. W.

AU - Nasrallah, M. M.

AU - Anderson, Harlan U.

AU - Sparlin, Don M.

PY - 1993/1/1

Y1 - 1993/1/1

N2 - Electrical conductivity and the Seebeck coefficient of compositions in the system Y 1-y Ca y MnO 3 and La 1-y Ca y MnO 3 were studied to determine the mechanism of electrical transport and defect structure. Electrical conduction appeared to occur via a small polaron hopping mechanism for compositions with 0.30 ≤ y ≤ 0.80. The Seebeck coefficient data did not support the assumption that Mn is present in Cadoped Mn perovskites only in the +3 and +4 valence states. A new defect model was developed which includes the thermally excited disproportion of Mn 3+ and Mn 4+ pairs. The Seebeck data were explained with this model by assuming that divalent Mn cations were site blockers in the conduction process. © 1993 Academic Press, Inc.

AB - Electrical conductivity and the Seebeck coefficient of compositions in the system Y 1-y Ca y MnO 3 and La 1-y Ca y MnO 3 were studied to determine the mechanism of electrical transport and defect structure. Electrical conduction appeared to occur via a small polaron hopping mechanism for compositions with 0.30 ≤ y ≤ 0.80. The Seebeck coefficient data did not support the assumption that Mn is present in Cadoped Mn perovskites only in the +3 and +4 valence states. A new defect model was developed which includes the thermally excited disproportion of Mn 3+ and Mn 4+ pairs. The Seebeck data were explained with this model by assuming that divalent Mn cations were site blockers in the conduction process. © 1993 Academic Press, Inc.

UR - https://scholarsmine.mst.edu/matsci_eng_facwork/3111

U2 - 10.1006/jssc.1993.1020

DO - 10.1006/jssc.1993.1020

M3 - Article

SN - 1095-726X

VL - 102

SP - 175

EP - 184

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 1

ER -

Defect Structure Of Y1-ycaymno3 And La1-ycaymno3. I. Electrical Properties

Abstract

Disciplines

Access to Document

Other files and links

Fingerprint

Cite this