Long- and short-range order in stuffed titanate pyrochlores

G. C. Lau; T. M. McQueen; Q. Huang; H. W. Zandbergen; R. J. Cava

doi:10.1016/j.jssc.2007.10.025

Long- and short-range order in stuffed titanate pyrochlores

G. C. Lau, T. M. McQueen, Q. Huang, H. W. Zandbergen, R. J. Cava

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

60 Scopus citations

Abstract

We report a structural study of the stuffed pyrochlore series Ln₂(Ti_2-xLn_x)O_7-x/2 (Ln=Ho, Yb; 0≤x≤0.67). Electron microscopy and Rietveld refinements of neutron powder diffraction data for the x=0.67 end members, Ho₂TiO₅ and Yb₂TiO₅, reveal that small domains (∼50 Å or less) exist where the Ln and Ti/Ln sublattices are pyrochlore like, while the average structure is fluorite like. Both the Ho and Yb stuffed pyrochlore series for 0.1≤x≤0.5 are shown to be a composite of long- and short-range-ordered pyrochlore phases. The relative fraction of long-range vs. short-range pyrochlore order decreases with increasing Ln doping. An additional complex structural modulation of the pyrochlore structure is observed in electron diffraction and high-resolution electron microscopy images.

Original language	English (US)
Pages (from-to)	45-50
Number of pages	6
Journal	Journal of Solid State Chemistry
Volume	181
Issue number	1
DOIs	https://doi.org/10.1016/j.jssc.2007.10.025
State	Published - Jan 2008

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

Keywords

Geometrically frustrated magnet
Pyrochlore
Pyrochlore to fluorite solid solution
Rare-earth titanate
Stuffed pyrochlore
Stuffed spin ice

Access to Document

10.1016/j.jssc.2007.10.025

Cite this

@article{c4a7620caa9548bd898584d8409db176,

title = "Long- and short-range order in stuffed titanate pyrochlores",

abstract = "We report a structural study of the stuffed pyrochlore series Ln2(Ti2-xLnx)O7-x/2 (Ln=Ho, Yb; 0≤x≤0.67). Electron microscopy and Rietveld refinements of neutron powder diffraction data for the x=0.67 end members, Ho2TiO5 and Yb2TiO5, reveal that small domains (∼50 {\AA} or less) exist where the Ln and Ti/Ln sublattices are pyrochlore like, while the average structure is fluorite like. Both the Ho and Yb stuffed pyrochlore series for 0.1≤x≤0.5 are shown to be a composite of long- and short-range-ordered pyrochlore phases. The relative fraction of long-range vs. short-range pyrochlore order decreases with increasing Ln doping. An additional complex structural modulation of the pyrochlore structure is observed in electron diffraction and high-resolution electron microscopy images.",

keywords = "Geometrically frustrated magnet, Pyrochlore, Pyrochlore to fluorite solid solution, Rare-earth titanate, Stuffed pyrochlore, Stuffed spin ice",

author = "Lau, {G. C.} and McQueen, {T. M.} and Q. Huang and Zandbergen, {H. W.} and Cava, {R. J.}",

note = "Funding Information: This work was supported by the National Science Foundation Division of Materials Research (DMR-0353610). T.M. McQueen gratefully acknowledges support by the National Science Foundation Graduate Research Fellowship program. Certain commercial chemicals and equipment are identified in this report to describe the subject adequately. Such identification does not imply recommendation or endorsement by the NIST, nor does it imply that the equipment identified is necessarily the best available for the purpose. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2008",

month = jan,

doi = "10.1016/j.jssc.2007.10.025",

language = "English (US)",

volume = "181",

pages = "45--50",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

number = "1",

}

TY - JOUR

T1 - Long- and short-range order in stuffed titanate pyrochlores

AU - Lau, G. C.

AU - McQueen, T. M.

AU - Huang, Q.

AU - Zandbergen, H. W.

AU - Cava, R. J.

N1 - Funding Information: This work was supported by the National Science Foundation Division of Materials Research (DMR-0353610). T.M. McQueen gratefully acknowledges support by the National Science Foundation Graduate Research Fellowship program. Certain commercial chemicals and equipment are identified in this report to describe the subject adequately. Such identification does not imply recommendation or endorsement by the NIST, nor does it imply that the equipment identified is necessarily the best available for the purpose. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2008/1

Y1 - 2008/1

N2 - We report a structural study of the stuffed pyrochlore series Ln2(Ti2-xLnx)O7-x/2 (Ln=Ho, Yb; 0≤x≤0.67). Electron microscopy and Rietveld refinements of neutron powder diffraction data for the x=0.67 end members, Ho2TiO5 and Yb2TiO5, reveal that small domains (∼50 Å or less) exist where the Ln and Ti/Ln sublattices are pyrochlore like, while the average structure is fluorite like. Both the Ho and Yb stuffed pyrochlore series for 0.1≤x≤0.5 are shown to be a composite of long- and short-range-ordered pyrochlore phases. The relative fraction of long-range vs. short-range pyrochlore order decreases with increasing Ln doping. An additional complex structural modulation of the pyrochlore structure is observed in electron diffraction and high-resolution electron microscopy images.

AB - We report a structural study of the stuffed pyrochlore series Ln2(Ti2-xLnx)O7-x/2 (Ln=Ho, Yb; 0≤x≤0.67). Electron microscopy and Rietveld refinements of neutron powder diffraction data for the x=0.67 end members, Ho2TiO5 and Yb2TiO5, reveal that small domains (∼50 Å or less) exist where the Ln and Ti/Ln sublattices are pyrochlore like, while the average structure is fluorite like. Both the Ho and Yb stuffed pyrochlore series for 0.1≤x≤0.5 are shown to be a composite of long- and short-range-ordered pyrochlore phases. The relative fraction of long-range vs. short-range pyrochlore order decreases with increasing Ln doping. An additional complex structural modulation of the pyrochlore structure is observed in electron diffraction and high-resolution electron microscopy images.

KW - Geometrically frustrated magnet

KW - Pyrochlore

KW - Pyrochlore to fluorite solid solution

KW - Rare-earth titanate

KW - Stuffed pyrochlore

KW - Stuffed spin ice

UR - http://www.scopus.com/inward/record.url?scp=37549032764&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=37549032764&partnerID=8YFLogxK

U2 - 10.1016/j.jssc.2007.10.025

DO - 10.1016/j.jssc.2007.10.025

M3 - Article

AN - SCOPUS:37549032764

SN - 0022-4596

VL - 181

SP - 45

EP - 50

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 1

ER -

Long- and short-range order in stuffed titanate pyrochlores

Abstract

All Science Journal Classification (ASJC) codes

Keywords

Access to Document

Other files and links

Fingerprint

Cite this