Solid solubilities of (La Nd,)2(Zr,Ti)2O7 phases deduced by neutron diffraction

Elizabeth J. Harvey; Karl R. Whittle; Gregory R. Lumpkin; Ronald I. Smith; Simon A.T. Redfern

doi:10.1016/j.jssc.2004.12.030

Solid solubilities of (La Nd,)₂(Zr,Ti)₂O₇ phases deduced by neutron diffraction

Elizabeth J. Harvey, Karl R. Whittle, Gregory R. Lumpkin, Ronald I. Smith, Simon A.T. Redfern^*

^*Corresponding author for this work

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

110 Citations (Scopus)

Abstract

Time-of-flight powder neutron diffraction has been performed on oxides with composition (La_1-xNd_x)₂Zr₂O ₇ and Nd₂(Zr_1-xTi_x) ₂O₇, where x=0, 0.2, 0.4,...1.0, in order to determine the solid solution behaviour across each series. Between La₂Zr ₂O₇ and Nd₂Zr₂O₇, a cubic pyrochlore phase is observed (Fd3̄m, Z=8). A linear decrease in the lattice parameter from 10.8047 to 10.6758 Å indicates complete miscibility of the two end-members. For the same series, the 48f oxygen x-parameter increases from 0.3313 to 0.3348, suggesting increased distortion of the 6 coordinate B sites and reduced distortion of the 8 coordinate A sites. There is limited solubility of Nd₂Ti₂O₇ in Nd ₂Zr₂O₇. Exsolution of a monoclinic phase (P21, Z=8) rich in Nd₂Ti₂O₇ is observed at approximately x=0.56. The compositional range over which a solid solution exists is more extensive than that which has been previously reported. The solubility of Nd₂Zr₂O₇ in Nd₂Ti ₂O₇ is very low.

Original language	English
Pages (from-to)	800-810
Number of pages	11
Journal	Journal of Solid State Chemistry
Volume	178
Issue number	3
DOIs	https://doi.org/10.1016/j.jssc.2004.12.030
Publication status	Published - Mar 2005
Externally published	Yes

ASJC Scopus Subject Areas

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

Keywords

Neutron diffraction
Pyrochlore
Solid solution

Access to Document

10.1016/j.jssc.2004.12.030

Cite this

@article{4fb660e2674d42679d32b1b71e662987,

title = "Solid solubilities of (La Nd,)2(Zr,Ti)2O7 phases deduced by neutron diffraction",

abstract = "Time-of-flight powder neutron diffraction has been performed on oxides with composition (La1-xNdx)2Zr2O 7 and Nd2(Zr1-xTix) 2O7, where x=0, 0.2, 0.4,...1.0, in order to determine the solid solution behaviour across each series. Between La2Zr 2O7 and Nd2Zr2O7, a cubic pyrochlore phase is observed (Fd{\=3}m, Z=8). A linear decrease in the lattice parameter from 10.8047 to 10.6758 {\AA} indicates complete miscibility of the two end-members. For the same series, the 48f oxygen x-parameter increases from 0.3313 to 0.3348, suggesting increased distortion of the 6 coordinate B sites and reduced distortion of the 8 coordinate A sites. There is limited solubility of Nd2Ti2O7 in Nd 2Zr2O7. Exsolution of a monoclinic phase (P21, Z=8) rich in Nd2Ti2O7 is observed at approximately x=0.56. The compositional range over which a solid solution exists is more extensive than that which has been previously reported. The solubility of Nd2Zr2O7 in Nd2Ti 2O7 is very low.",

keywords = "Neutron diffraction, Pyrochlore, Solid solution",

author = "Harvey, {Elizabeth J.} and Whittle, {Karl R.} and Lumpkin, {Gregory R.} and Smith, {Ronald I.} and Redfern, {Simon A.T.}",

year = "2005",

month = mar,

doi = "10.1016/j.jssc.2004.12.030",

language = "English",

volume = "178",

pages = "800--810",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

number = "3",

}

TY - JOUR

T1 - Solid solubilities of (La Nd,)2(Zr,Ti)2O7 phases deduced by neutron diffraction

AU - Harvey, Elizabeth J.

AU - Whittle, Karl R.

AU - Lumpkin, Gregory R.

AU - Smith, Ronald I.

AU - Redfern, Simon A.T.

PY - 2005/3

Y1 - 2005/3

N2 - Time-of-flight powder neutron diffraction has been performed on oxides with composition (La1-xNdx)2Zr2O 7 and Nd2(Zr1-xTix) 2O7, where x=0, 0.2, 0.4,...1.0, in order to determine the solid solution behaviour across each series. Between La2Zr 2O7 and Nd2Zr2O7, a cubic pyrochlore phase is observed (Fd3̄m, Z=8). A linear decrease in the lattice parameter from 10.8047 to 10.6758 Å indicates complete miscibility of the two end-members. For the same series, the 48f oxygen x-parameter increases from 0.3313 to 0.3348, suggesting increased distortion of the 6 coordinate B sites and reduced distortion of the 8 coordinate A sites. There is limited solubility of Nd2Ti2O7 in Nd 2Zr2O7. Exsolution of a monoclinic phase (P21, Z=8) rich in Nd2Ti2O7 is observed at approximately x=0.56. The compositional range over which a solid solution exists is more extensive than that which has been previously reported. The solubility of Nd2Zr2O7 in Nd2Ti 2O7 is very low.

AB - Time-of-flight powder neutron diffraction has been performed on oxides with composition (La1-xNdx)2Zr2O 7 and Nd2(Zr1-xTix) 2O7, where x=0, 0.2, 0.4,...1.0, in order to determine the solid solution behaviour across each series. Between La2Zr 2O7 and Nd2Zr2O7, a cubic pyrochlore phase is observed (Fd3̄m, Z=8). A linear decrease in the lattice parameter from 10.8047 to 10.6758 Å indicates complete miscibility of the two end-members. For the same series, the 48f oxygen x-parameter increases from 0.3313 to 0.3348, suggesting increased distortion of the 6 coordinate B sites and reduced distortion of the 8 coordinate A sites. There is limited solubility of Nd2Ti2O7 in Nd 2Zr2O7. Exsolution of a monoclinic phase (P21, Z=8) rich in Nd2Ti2O7 is observed at approximately x=0.56. The compositional range over which a solid solution exists is more extensive than that which has been previously reported. The solubility of Nd2Zr2O7 in Nd2Ti 2O7 is very low.

KW - Neutron diffraction

KW - Pyrochlore

KW - Solid solution

UR - http://www.scopus.com/inward/record.url?scp=17744384928&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=17744384928&partnerID=8YFLogxK

U2 - 10.1016/j.jssc.2004.12.030

DO - 10.1016/j.jssc.2004.12.030

M3 - Article

AN - SCOPUS:17744384928

SN - 0022-4596

VL - 178

SP - 800

EP - 810

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 3

ER -