Effect of microstructure on electrical and mechanical properties of La5.4WO12-δ proton conductor

Wendelin Deibert; Vasiliki Stournari; Mariya E. Ivanova; Sonia Escolástico; José M. Serra; Jürgen Malzbender; Tilmann Beck; Lorenz Singheiser; Olivier Guillon; Wilhelm A. Meulenberg

doi:10.1016/j.jeurceramsoc.2018.04.009

Effect of microstructure on electrical and mechanical properties of La_5.4WO_12-δ proton conductor

Wendelin Deibert^* (Corresponding Author)
, Vasiliki Stournari
, Mariya E. Ivanova
, Sonia Escolástico
, José M. Serra
, Jürgen Malzbender
, Tilmann Beck
, Lorenz Singheiser
, Olivier Guillon
, Wilhelm A. Meulenberg

^*Corresponding author for this work

Inorganic Membranes

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

9 Citations (Scopus)

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Abstract

The relationships between microstructural characteristics and electrical as well as mechanical properties of La_5.4WO_12-δ (LWO54) materials were studied. Polycrystalline LWO54 samples revealed identical transport mechanisms regardless of the sample microstructure. The studied samples show predominately proton conductor behaviour below 800 °C and become predominant n-type and oxygen ion conductors above this temperature. The magnitude of the total conductivity is enhanced with larger grain size and lower porosity. Young's modulus decreased by 20% with increasing temperature up to 1000 °C regardless of grain size and atmosphere. Fracture strength was determined via ring-on-ring bending tests, yielding values that strongly depended on microstructural characteristics and homogeneity of the microstructure. Elevated temperature deformation studies revealed that creep is governed by cation diffusion mechanism.

Original language	English
Pages (from-to)	3527-3538
Number of pages	12
Journal	Journal of the European Ceramic Society
Volume	38
Issue number	10
Early online date	7 Apr 2018
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2018.04.009
Publication status	Published - 1 Aug 2018

Keywords

Conductivity
Creep
Lanthanum tungstate
Mechanical properties
Proton-Conducting ceramic membranes
Strength
n/a OA procedure

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10.1016/j.jeurceramsoc.2018.04.009

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title = "Effect of microstructure on electrical and mechanical properties of La5.4WO12-δ proton conductor",

abstract = "The relationships between microstructural characteristics and electrical as well as mechanical properties of La5.4WO12-δ (LWO54) materials were studied. Polycrystalline LWO54 samples revealed identical transport mechanisms regardless of the sample microstructure. The studied samples show predominately proton conductor behaviour below 800 °C and become predominant n-type and oxygen ion conductors above this temperature. The magnitude of the total conductivity is enhanced with larger grain size and lower porosity. Young's modulus decreased by 20\% with increasing temperature up to 1000 °C regardless of grain size and atmosphere. Fracture strength was determined via ring-on-ring bending tests, yielding values that strongly depended on microstructural characteristics and homogeneity of the microstructure. Elevated temperature deformation studies revealed that creep is governed by cation diffusion mechanism.",

keywords = "Conductivity, Creep, Lanthanum tungstate, Mechanical properties, Proton-Conducting ceramic membranes, Strength, n/a OA procedure",

author = "Wendelin Deibert and Vasiliki Stournari and Ivanova, \{Mariya E.\} and Sonia Escol{\'a}stico and Serra, \{Jos{\'e} M.\} and J{\"u}rgen Malzbender and Tilmann Beck and Lorenz Singheiser and Olivier Guillon and Meulenberg, \{Wilhelm A.\}",

year = "2018",

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doi = "10.1016/j.jeurceramsoc.2018.04.009",

language = "English",

volume = "38",

pages = "3527--3538",

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T1 - Effect of microstructure on electrical and mechanical properties of La5.4WO12-δ proton conductor

AU - Deibert, Wendelin

AU - Stournari, Vasiliki

AU - Ivanova, Mariya E.

AU - Escolástico, Sonia

AU - Serra, José M.

AU - Malzbender, Jürgen

AU - Beck, Tilmann

AU - Singheiser, Lorenz

AU - Guillon, Olivier

AU - Meulenberg, Wilhelm A.

PY - 2018/8/1

Y1 - 2018/8/1

N2 - The relationships between microstructural characteristics and electrical as well as mechanical properties of La5.4WO12-δ (LWO54) materials were studied. Polycrystalline LWO54 samples revealed identical transport mechanisms regardless of the sample microstructure. The studied samples show predominately proton conductor behaviour below 800 °C and become predominant n-type and oxygen ion conductors above this temperature. The magnitude of the total conductivity is enhanced with larger grain size and lower porosity. Young's modulus decreased by 20% with increasing temperature up to 1000 °C regardless of grain size and atmosphere. Fracture strength was determined via ring-on-ring bending tests, yielding values that strongly depended on microstructural characteristics and homogeneity of the microstructure. Elevated temperature deformation studies revealed that creep is governed by cation diffusion mechanism.

AB - The relationships between microstructural characteristics and electrical as well as mechanical properties of La5.4WO12-δ (LWO54) materials were studied. Polycrystalline LWO54 samples revealed identical transport mechanisms regardless of the sample microstructure. The studied samples show predominately proton conductor behaviour below 800 °C and become predominant n-type and oxygen ion conductors above this temperature. The magnitude of the total conductivity is enhanced with larger grain size and lower porosity. Young's modulus decreased by 20% with increasing temperature up to 1000 °C regardless of grain size and atmosphere. Fracture strength was determined via ring-on-ring bending tests, yielding values that strongly depended on microstructural characteristics and homogeneity of the microstructure. Elevated temperature deformation studies revealed that creep is governed by cation diffusion mechanism.

KW - Conductivity

KW - Creep

KW - Lanthanum tungstate

KW - Mechanical properties

KW - Proton-Conducting ceramic membranes

KW - Strength

KW - n/a OA procedure

UR - https://www.scopus.com/pages/publications/85045478144

U2 - 10.1016/j.jeurceramsoc.2018.04.009

DO - 10.1016/j.jeurceramsoc.2018.04.009

M3 - Article

AN - SCOPUS:85045478144

SN - 0955-2219

VL - 38

SP - 3527

EP - 3538

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 10

ER -

Effect of microstructure on electrical and mechanical properties of La_5.4WO_12-δ proton conductor

Abstract

Keywords

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