Synthesis, sinterability and ionic conductivity of nanocrystalline La2Mo209 powders

John Thomas Sirr Irvine; D Marrero-Lopez; J Canales-Vazquez; JC Ruiz-Morales; A Rodriguez; P Nunez

doi:10.1016/j.ssi.2005.05.005

Synthesis, sinterability and ionic conductivity of nanocrystalline La₂Mo₂₀₉ powders

John Thomas Sirr Irvine, D Marrero-Lopez, J Canales-Vazquez, JC Ruiz-Morales, A Rodriguez, P Nunez

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

Abstract

A modified freeze-dried method has been used to obtain polycrystalline powders of the ionic conductor La2Mo2O9. Such ceramic powders were characterized by TG/DTA, XRD, SEM and TEM, and their sinterability was analysed by dilatometry and isothermal sintering studies. The nanocrystalline powders possessed high reactivity and good sinterability, producing dense pellets at only 1023 K with an average grain size of 1.5 mu m. Bulk and grain boundary conductivities of La2Mo2O9 have been investigated by impedance spectroscopy in samples sintered in a range of temperatures, i.e. between 1023 and 1373 K, and their magnitudes correlated with the microstructure. A significant grain boundary resistance was found for sintered samples prepared at temperatures below 1173 K, causing a pronounced decrease in the overall conductivity, even at high temperature. This contribution however was minimised upon sintering at temperatures above 1173 K, yielding ionic conductivity values of 0.12 S/cm at 1073 K. (c) 2005 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	1807-1816
Number of pages	10
Journal	Solid State Ionics
Volume	176
DOIs	https://doi.org/10.1016/j.ssi.2005.05.005
Publication status	Published - Jul 2005

Keywords

La2Mo2O9
freeze-dried precursor
phase transition
impedance spectroscopy
grain boundary
ion blocking
TRANSPORT-PROPERTIES
LAMOX FAMILY
CONDUCTORS
CERAMICS
CERIA
GD

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10.1016/j.ssi.2005.05.005

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title = "Synthesis, sinterability and ionic conductivity of nanocrystalline La2Mo209 powders",

abstract = "A modified freeze-dried method has been used to obtain polycrystalline powders of the ionic conductor La2Mo2O9. Such ceramic powders were characterized by TG/DTA, XRD, SEM and TEM, and their sinterability was analysed by dilatometry and isothermal sintering studies. The nanocrystalline powders possessed high reactivity and good sinterability, producing dense pellets at only 1023 K with an average grain size of 1.5 mu m. Bulk and grain boundary conductivities of La2Mo2O9 have been investigated by impedance spectroscopy in samples sintered in a range of temperatures, i.e. between 1023 and 1373 K, and their magnitudes correlated with the microstructure. A significant grain boundary resistance was found for sintered samples prepared at temperatures below 1173 K, causing a pronounced decrease in the overall conductivity, even at high temperature. This contribution however was minimised upon sintering at temperatures above 1173 K, yielding ionic conductivity values of 0.12 S/cm at 1073 K. (c) 2005 Elsevier B.V. All rights reserved.",

keywords = "La2Mo2O9, freeze-dried precursor, phase transition, impedance spectroscopy, grain boundary, ion blocking, TRANSPORT-PROPERTIES, LAMOX FAMILY, CONDUCTORS, CERAMICS, CERIA, GD",

author = "Irvine, {John Thomas Sirr} and D Marrero-Lopez and J Canales-Vazquez and JC Ruiz-Morales and A Rodriguez and P Nunez",

year = "2005",

month = jul,

doi = "10.1016/j.ssi.2005.05.005",

language = "English",

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AU - Irvine, John Thomas Sirr

AU - Marrero-Lopez, D

AU - Canales-Vazquez, J

AU - Ruiz-Morales, JC

AU - Rodriguez, A

AU - Nunez, P

PY - 2005/7

Y1 - 2005/7

N2 - A modified freeze-dried method has been used to obtain polycrystalline powders of the ionic conductor La2Mo2O9. Such ceramic powders were characterized by TG/DTA, XRD, SEM and TEM, and their sinterability was analysed by dilatometry and isothermal sintering studies. The nanocrystalline powders possessed high reactivity and good sinterability, producing dense pellets at only 1023 K with an average grain size of 1.5 mu m. Bulk and grain boundary conductivities of La2Mo2O9 have been investigated by impedance spectroscopy in samples sintered in a range of temperatures, i.e. between 1023 and 1373 K, and their magnitudes correlated with the microstructure. A significant grain boundary resistance was found for sintered samples prepared at temperatures below 1173 K, causing a pronounced decrease in the overall conductivity, even at high temperature. This contribution however was minimised upon sintering at temperatures above 1173 K, yielding ionic conductivity values of 0.12 S/cm at 1073 K. (c) 2005 Elsevier B.V. All rights reserved.

AB - A modified freeze-dried method has been used to obtain polycrystalline powders of the ionic conductor La2Mo2O9. Such ceramic powders were characterized by TG/DTA, XRD, SEM and TEM, and their sinterability was analysed by dilatometry and isothermal sintering studies. The nanocrystalline powders possessed high reactivity and good sinterability, producing dense pellets at only 1023 K with an average grain size of 1.5 mu m. Bulk and grain boundary conductivities of La2Mo2O9 have been investigated by impedance spectroscopy in samples sintered in a range of temperatures, i.e. between 1023 and 1373 K, and their magnitudes correlated with the microstructure. A significant grain boundary resistance was found for sintered samples prepared at temperatures below 1173 K, causing a pronounced decrease in the overall conductivity, even at high temperature. This contribution however was minimised upon sintering at temperatures above 1173 K, yielding ionic conductivity values of 0.12 S/cm at 1073 K. (c) 2005 Elsevier B.V. All rights reserved.

KW - La2Mo2O9

KW - freeze-dried precursor

KW - phase transition

KW - impedance spectroscopy

KW - grain boundary

KW - ion blocking

KW - TRANSPORT-PROPERTIES

KW - LAMOX FAMILY

KW - CONDUCTORS

KW - CERAMICS

KW - CERIA

KW - GD

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U2 - 10.1016/j.ssi.2005.05.005

DO - 10.1016/j.ssi.2005.05.005

M3 - Article

SN - 0167-2738

VL - 176

SP - 1807

EP - 1816

JO - Solid State Ionics

JF - Solid State Ionics

ER -

Synthesis, sinterability and ionic conductivity of nanocrystalline La₂Mo₂₀₉ powders

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Keywords

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