Synthesis and properties of lanthanum sodium manganate perovskite crystals

W. H. McCarroll; Ian D. Fawcett; M. Greenblatt; K. V. Ramanujachary

doi:10.1006/jssc.1999.8312

Synthesis and properties of lanthanum sodium manganate perovskite crystals

W. H. McCarroll, Ian D. Fawcett, M. Greenblatt, K. V. Ramanujachary

Chemistry

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

24 Scopus citations

Abstract

Crystals up to 4 mm on the edge of sodium-substituted lanthanum manganates with the rhombohedral perovskite structure have been grown for the first time using fused salt electrolysis at 980-1000°C. Cs₂MoO₄-MoO₃ mixtures have been employed as solvents. Substitution of Na for La appears to be limited to about 12 at.%. All the phases prepared have an average Mn valence of 3.26(2) which is a result of decreasing A-site vacancies as the Na content is increased. The Curie and insulator-metal transition temperatures increase with increasing Na content with values of 300-320 K being observed for samples containing 10-12 at.% Na. Magnetoresistance values (5 T field) of ∼62% at 300 K with a maximum value of 76% at 280 K were observed for a sample of composition Na_0.099Lao_0.889Mn_0.996O₃.

Original language	English (US)
Pages (from-to)	88-95
Number of pages	8
Journal	Journal of Solid State Chemistry
Volume	146
Issue number	1
DOIs	https://doi.org/10.1006/jssc.1999.8312
State	Published - Aug 1999

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

Access to Document

10.1006/jssc.1999.8312

Cite this

@article{780c5863f9df4fabacf38da00aca4d73,

title = "Synthesis and properties of lanthanum sodium manganate perovskite crystals",

abstract = "Crystals up to 4 mm on the edge of sodium-substituted lanthanum manganates with the rhombohedral perovskite structure have been grown for the first time using fused salt electrolysis at 980-1000°C. Cs2MoO4-MoO3 mixtures have been employed as solvents. Substitution of Na for La appears to be limited to about 12 at.%. All the phases prepared have an average Mn valence of 3.26(2) which is a result of decreasing A-site vacancies as the Na content is increased. The Curie and insulator-metal transition temperatures increase with increasing Na content with values of 300-320 K being observed for samples containing 10-12 at.% Na. Magnetoresistance values (5 T field) of ∼62% at 300 K with a maximum value of 76% at 280 K were observed for a sample of composition Na0.099Lao0.889Mn0.996O3.",

author = "McCarroll, {W. H.} and Fawcett, {Ian D.} and M. Greenblatt and Ramanujachary, {K. V.}",

year = "1999",

month = aug,

doi = "10.1006/jssc.1999.8312",

language = "English (US)",

volume = "146",

pages = "88--95",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

number = "1",

}

TY - JOUR

T1 - Synthesis and properties of lanthanum sodium manganate perovskite crystals

AU - McCarroll, W. H.

AU - Fawcett, Ian D.

AU - Greenblatt, M.

AU - Ramanujachary, K. V.

PY - 1999/8

Y1 - 1999/8

N2 - Crystals up to 4 mm on the edge of sodium-substituted lanthanum manganates with the rhombohedral perovskite structure have been grown for the first time using fused salt electrolysis at 980-1000°C. Cs2MoO4-MoO3 mixtures have been employed as solvents. Substitution of Na for La appears to be limited to about 12 at.%. All the phases prepared have an average Mn valence of 3.26(2) which is a result of decreasing A-site vacancies as the Na content is increased. The Curie and insulator-metal transition temperatures increase with increasing Na content with values of 300-320 K being observed for samples containing 10-12 at.% Na. Magnetoresistance values (5 T field) of ∼62% at 300 K with a maximum value of 76% at 280 K were observed for a sample of composition Na0.099Lao0.889Mn0.996O3.

AB - Crystals up to 4 mm on the edge of sodium-substituted lanthanum manganates with the rhombohedral perovskite structure have been grown for the first time using fused salt electrolysis at 980-1000°C. Cs2MoO4-MoO3 mixtures have been employed as solvents. Substitution of Na for La appears to be limited to about 12 at.%. All the phases prepared have an average Mn valence of 3.26(2) which is a result of decreasing A-site vacancies as the Na content is increased. The Curie and insulator-metal transition temperatures increase with increasing Na content with values of 300-320 K being observed for samples containing 10-12 at.% Na. Magnetoresistance values (5 T field) of ∼62% at 300 K with a maximum value of 76% at 280 K were observed for a sample of composition Na0.099Lao0.889Mn0.996O3.

UR - http://www.scopus.com/inward/record.url?scp=0002253229&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0002253229&partnerID=8YFLogxK

U2 - 10.1006/jssc.1999.8312

DO - 10.1006/jssc.1999.8312

M3 - Article

AN - SCOPUS:0002253229

SN - 0022-4596

VL - 146

SP - 88

EP - 95

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 1

ER -

Synthesis and properties of lanthanum sodium manganate perovskite crystals

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this