Electron Microscopy of Lead Pyroniobate

Rick Ubic; I. M. Reaney

doi:10.1016/S0955-2219(01)00185-6

Electron Microscopy of Lead Pyroniobate

Rick Ubic, I. M. Reaney

Micron School of Materials Science and Engineering

University of Sheffield

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

6 Scopus citations

Abstract

This work investigates the structure and stability of the pyrochlore solid solution Pb _n Nb ₂ O _{5+ n} using a combination of highresolution electron microscopy and electron diffraction. Single-phase cubic pyrochlore has been obtained for a Pb _1.5 Nb ₂ O _6.5 composition. As expected, compositions containing higher [Pb]/[Nb] ratios showed discreet PbO-rich layers between alternating layers of Pb _1.5 Nb ₂ O _6.5 , similar in appearance to Ruddlesden–Popper phases. The occurrence of these layers, which lie along <111> _c planes, results in a lowering of the overall symmetry to trigonal. These layers and their spacing have a profound effect on the dielectric properties of the ceramics, with a spacing of about 18.3 Å resulting in the most temperature-stable structure.

Original language	American English
Pages (from-to)	2123-2126
Number of pages	4
Journal	Journal of the European Ceramic Society
Volume	21
Issue number	10-11
DOIs	https://doi.org/10.1016/S0955-2219(01)00185-6
State	Published - 2001

Keywords

Dielectric properties
Electron microscopy
Niobates; Pyrochlores
X-ray methods
Niobates
Pyrochlores

EGS Disciplines

Materials Science and Engineering

Access to Document

10.1016/S0955-2219(01)00185-6

Cite this

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title = "Electron Microscopy of Lead Pyroniobate",

abstract = " This work investigates the structure and stability of the pyrochlore solid solution Pb n Nb 2 O 5+ n using a combination of highresolution electron microscopy and electron diffraction. Single-phase cubic pyrochlore has been obtained for a Pb 1.5 Nb 2 O 6.5 composition. As expected, compositions containing higher [Pb]/[Nb] ratios showed discreet PbO-rich layers between alternating layers of Pb 1.5 Nb 2 O 6.5 , similar in appearance to Ruddlesden–Popper phases. The occurrence of these layers, which lie along <111> c planes, results in a lowering of the overall symmetry to trigonal. These layers and their spacing have a profound effect on the dielectric properties of the ceramics, with a spacing of about 18.3 {\AA} resulting in the most temperature-stable structure.",

keywords = "Dielectric properties, Electron microscopy, Niobates; Pyrochlores, X-ray methods, Niobates, Pyrochlores",

author = "Rick Ubic and Reaney, \{I. M.\}",

year = "2001",

doi = "10.1016/S0955-2219(01)00185-6",

language = "American English",

volume = "21",

pages = "2123--2126",

number = "10-11",

}

TY - JOUR

T1 - Electron Microscopy of Lead Pyroniobate

AU - Ubic, Rick

AU - Reaney, I. M.

PY - 2001

Y1 - 2001

N2 - This work investigates the structure and stability of the pyrochlore solid solution Pb n Nb 2 O 5+ n using a combination of highresolution electron microscopy and electron diffraction. Single-phase cubic pyrochlore has been obtained for a Pb 1.5 Nb 2 O 6.5 composition. As expected, compositions containing higher [Pb]/[Nb] ratios showed discreet PbO-rich layers between alternating layers of Pb 1.5 Nb 2 O 6.5 , similar in appearance to Ruddlesden–Popper phases. The occurrence of these layers, which lie along <111> c planes, results in a lowering of the overall symmetry to trigonal. These layers and their spacing have a profound effect on the dielectric properties of the ceramics, with a spacing of about 18.3 Å resulting in the most temperature-stable structure.

AB - This work investigates the structure and stability of the pyrochlore solid solution Pb n Nb 2 O 5+ n using a combination of highresolution electron microscopy and electron diffraction. Single-phase cubic pyrochlore has been obtained for a Pb 1.5 Nb 2 O 6.5 composition. As expected, compositions containing higher [Pb]/[Nb] ratios showed discreet PbO-rich layers between alternating layers of Pb 1.5 Nb 2 O 6.5 , similar in appearance to Ruddlesden–Popper phases. The occurrence of these layers, which lie along <111> c planes, results in a lowering of the overall symmetry to trigonal. These layers and their spacing have a profound effect on the dielectric properties of the ceramics, with a spacing of about 18.3 Å resulting in the most temperature-stable structure.

KW - Dielectric properties

KW - Electron microscopy

KW - Niobates; Pyrochlores

KW - X-ray methods

KW - Niobates

KW - Pyrochlores

UR - http://dx.doi.org/10.1016/S0955-2219(01)00185-6

UR - https://www.scopus.com/pages/publications/0034893983

U2 - 10.1016/S0955-2219(01)00185-6

DO - 10.1016/S0955-2219(01)00185-6

M3 - Article

VL - 21

SP - 2123

EP - 2126

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 10-11

ER -

Electron Microscopy of Lead Pyroniobate

Abstract

Keywords

EGS Disciplines

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