Combined positron-annihilation and structural studies of hydrothermally grown zirconia

Janusz D. Fidelus; Andrzej Karbowski; Sebastiano Mariazzi; Ewa Werner-Malento; Roberto S. Brusa; Wuzong Zhou; Grzegorz P. Karwasz

doi:10.1680/nme.11.00014

Combined positron-annihilation and structural studies of hydrothermally grown zirconia

Janusz D. Fidelus, Andrzej Karbowski, Sebastiano Mariazzi, Ewa Werner-Malento, Roberto S. Brusa, Wuzong Zhou, Grzegorz P. Karwasz

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

7 Citations (Scopus)

Abstract

Nanoporous zirconia is used in gas sensors and as a membrane in high-temperature fuel cells. In the present work, positron annihilation spectroscopy and transmission electron microscopy (TEM) were performed on pure zirconia-sintered nanopowders, to determine the porosity. The ortho-positronium annihilation parameter R of zirconia samples, treated at 800ºC and 700ºC and annealed in oxygen–nitrogen atmosphere with different O2 contents, were obtained. The photoluminescence, positron annihilation spectroscopy, and TEM studies show presence of defects in all samples. Furthermore, the positron annihilation studies indicate a presence of large free volumes (of the order of few atomic units, at least), open towards the nanocrystals surface what was confi rmed by TEM observations which detected a few types of defects such as voids within ≈2–4 interplane distances, stacking faults, terraces and point defects.

Original language	English
Pages (from-to)	97-105
Journal	Nanomaterials and Energy
Volume	1
Issue number	2
DOIs	https://doi.org/10.1680/nme.11.00014
Publication status	Published - Mar 2012

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title = "Combined positron-annihilation and structural studies of hydrothermally grown zirconia",

abstract = "Nanoporous zirconia is used in gas sensors and as a membrane in high-temperature fuel cells. In the present work, positron annihilation spectroscopy and transmission electron microscopy (TEM) were performed on pure zirconia-sintered nanopowders, to determine the porosity. The ortho-positronium annihilation parameter R of zirconia samples, treated at 800ºC and 700ºC and annealed in oxygen–nitrogen atmosphere with different O2 contents, were obtained. The photoluminescence, positron annihilation spectroscopy, and TEM studies show presence of defects in all samples. Furthermore, the positron annihilation studies indicate a presence of large free volumes (of the order of few atomic units, at least), open towards the nanocrystals surface what was confi rmed by TEM observations which detected a few types of defects such as voids within ≈2–4 interplane distances, stacking faults, terraces and point defects.",

author = "Fidelus, {Janusz D.} and Andrzej Karbowski and Sebastiano Mariazzi and Ewa Werner-Malento and Brusa, {Roberto S.} and Wuzong Zhou and Karwasz, {Grzegorz P.}",

year = "2012",

month = mar,

doi = "10.1680/nme.11.00014",

language = "English",

volume = "1",

pages = "97--105",

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T1 - Combined positron-annihilation and structural studies of hydrothermally grown zirconia

AU - Fidelus, Janusz D.

AU - Karbowski, Andrzej

AU - Mariazzi, Sebastiano

AU - Werner-Malento, Ewa

AU - Brusa, Roberto S.

AU - Zhou, Wuzong

AU - Karwasz, Grzegorz P.

PY - 2012/3

Y1 - 2012/3

N2 - Nanoporous zirconia is used in gas sensors and as a membrane in high-temperature fuel cells. In the present work, positron annihilation spectroscopy and transmission electron microscopy (TEM) were performed on pure zirconia-sintered nanopowders, to determine the porosity. The ortho-positronium annihilation parameter R of zirconia samples, treated at 800ºC and 700ºC and annealed in oxygen–nitrogen atmosphere with different O2 contents, were obtained. The photoluminescence, positron annihilation spectroscopy, and TEM studies show presence of defects in all samples. Furthermore, the positron annihilation studies indicate a presence of large free volumes (of the order of few atomic units, at least), open towards the nanocrystals surface what was confi rmed by TEM observations which detected a few types of defects such as voids within ≈2–4 interplane distances, stacking faults, terraces and point defects.

AB - Nanoporous zirconia is used in gas sensors and as a membrane in high-temperature fuel cells. In the present work, positron annihilation spectroscopy and transmission electron microscopy (TEM) were performed on pure zirconia-sintered nanopowders, to determine the porosity. The ortho-positronium annihilation parameter R of zirconia samples, treated at 800ºC and 700ºC and annealed in oxygen–nitrogen atmosphere with different O2 contents, were obtained. The photoluminescence, positron annihilation spectroscopy, and TEM studies show presence of defects in all samples. Furthermore, the positron annihilation studies indicate a presence of large free volumes (of the order of few atomic units, at least), open towards the nanocrystals surface what was confi rmed by TEM observations which detected a few types of defects such as voids within ≈2–4 interplane distances, stacking faults, terraces and point defects.

U2 - 10.1680/nme.11.00014

DO - 10.1680/nme.11.00014

M3 - Article

SN - 2045-9831

VL - 1

SP - 97

EP - 105

JO - Nanomaterials and Energy

JF - Nanomaterials and Energy

IS - 2

ER -

Combined positron-annihilation and structural studies of hydrothermally grown zirconia

Abstract

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