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Synthesis and Characterization of Oxide Conductors in Pbo-Bi2o3-M2o5 (M = V, P, As)

Materials of compositions PbBi6M2O15 and (PbO)n(BiMO4), where M = V, P, As and n = 1, 2, 4 were prepared via solid state reaction. These materials were characterised using X-ray diffraction (XRD), density measurement, inductively coupled plasmaatomic emission spectrometry (ICP-AES), ac impedance...

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Main Author: Lee, Chiu Sze
Format: Thesis
Language:English
English
Published: 2004
Online Access:http://psasir.upm.edu.my/id/eprint/62/1/1000548970_t_FSAS_2004_13.pdf
http://psasir.upm.edu.my/id/eprint/62/
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spelling my.upm.eprints.622013-05-27T06:45:23Z http://psasir.upm.edu.my/id/eprint/62/ Synthesis and Characterization of Oxide Conductors in Pbo-Bi2o3-M2o5 (M = V, P, As) Lee, Chiu Sze Materials of compositions PbBi6M2O15 and (PbO)n(BiMO4), where M = V, P, As and n = 1, 2, 4 were prepared via solid state reaction. These materials were characterised using X-ray diffraction (XRD), density measurement, inductively coupled plasmaatomic emission spectrometry (ICP-AES), ac impedance spectroscopy, differential thermal analysis (DTA), thermogravimetry analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Complete solid solution series were obtained in the PbBi6V2O15-PbBi6P2O15, PbBi6V2O15-PbBi6As2O15 and PbBi6P2O15-PbBi6As2O15 systems. All the materials were isostructural, and crystallised in orthorhombic symmetry. However, the cell parameter a of these materials was twice those reported in JCPDS. The conductivity of these materials decreased in the order of PbBi6V2O15 > PbBi6As2O15 > PbBi6P2O15. PbBi6V2O15 is an oxide ion conductor as it has a transference number of 0.8 above 650ºC. v Substitution of Sr for Pb in PbBi6V2O15 resulted in the formation a new material of SrBi6V2O15 with higher conductivity. On the other hand, Pb in both PbBi6V2O15 and PbBi6As2O15 could be replaced by Na and Bi, resulting in the formation of NaBi13V4O30 and NaBi13As4O30. Besides successfully suppressing the phase transition observed in PbBi6V2O15, these materials had higher conductivity compared to that of PbBi6(V/As)2O15. The conductivity of these materials was in the range of ~ 10-3 ohm-1 cm-1 at 800°C. Conductivity decreased in the order of NaBi13V4O30 > SrBi6V2O15 > PbBi6V2O15. These materials appeared to be oxide ion conductors. Complete solid solution series were formed in the Pb2BiPO6-Pb2BiAsO6, Pb4BiPO8- Pb4BiVO8, Pb4BiPO8-Pb4BiAsO8 and Pb4BiVO8-Pb4BiAsO8 systems. The properties determined generally agreed with those reported; these materials were mixed oxide ion conductors. The conductivity decreased in the order of Pb2BiMO6 > PbBiMO5 > Pb4BiMO8, and V > As > P. 2004-04 Thesis NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/62/1/1000548970_t_FSAS_2004_13.pdf Lee, Chiu Sze (2004) Synthesis and Characterization of Oxide Conductors in Pbo-Bi2o3-M2o5 (M = V, P, As). PhD thesis, Universiti Putra Malaysia. English
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
description Materials of compositions PbBi6M2O15 and (PbO)n(BiMO4), where M = V, P, As and n = 1, 2, 4 were prepared via solid state reaction. These materials were characterised using X-ray diffraction (XRD), density measurement, inductively coupled plasmaatomic emission spectrometry (ICP-AES), ac impedance spectroscopy, differential thermal analysis (DTA), thermogravimetry analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Complete solid solution series were obtained in the PbBi6V2O15-PbBi6P2O15, PbBi6V2O15-PbBi6As2O15 and PbBi6P2O15-PbBi6As2O15 systems. All the materials were isostructural, and crystallised in orthorhombic symmetry. However, the cell parameter a of these materials was twice those reported in JCPDS. The conductivity of these materials decreased in the order of PbBi6V2O15 > PbBi6As2O15 > PbBi6P2O15. PbBi6V2O15 is an oxide ion conductor as it has a transference number of 0.8 above 650ºC. v Substitution of Sr for Pb in PbBi6V2O15 resulted in the formation a new material of SrBi6V2O15 with higher conductivity. On the other hand, Pb in both PbBi6V2O15 and PbBi6As2O15 could be replaced by Na and Bi, resulting in the formation of NaBi13V4O30 and NaBi13As4O30. Besides successfully suppressing the phase transition observed in PbBi6V2O15, these materials had higher conductivity compared to that of PbBi6(V/As)2O15. The conductivity of these materials was in the range of ~ 10-3 ohm-1 cm-1 at 800°C. Conductivity decreased in the order of NaBi13V4O30 > SrBi6V2O15 > PbBi6V2O15. These materials appeared to be oxide ion conductors. Complete solid solution series were formed in the Pb2BiPO6-Pb2BiAsO6, Pb4BiPO8- Pb4BiVO8, Pb4BiPO8-Pb4BiAsO8 and Pb4BiVO8-Pb4BiAsO8 systems. The properties determined generally agreed with those reported; these materials were mixed oxide ion conductors. The conductivity decreased in the order of Pb2BiMO6 > PbBiMO5 > Pb4BiMO8, and V > As > P.
format Thesis
author Lee, Chiu Sze
spellingShingle Lee, Chiu Sze
Synthesis and Characterization of Oxide Conductors in Pbo-Bi2o3-M2o5 (M = V, P, As)
author_facet Lee, Chiu Sze
author_sort Lee, Chiu Sze
title Synthesis and Characterization of Oxide Conductors in Pbo-Bi2o3-M2o5 (M = V, P, As)
title_short Synthesis and Characterization of Oxide Conductors in Pbo-Bi2o3-M2o5 (M = V, P, As)
title_full Synthesis and Characterization of Oxide Conductors in Pbo-Bi2o3-M2o5 (M = V, P, As)
title_fullStr Synthesis and Characterization of Oxide Conductors in Pbo-Bi2o3-M2o5 (M = V, P, As)
title_full_unstemmed Synthesis and Characterization of Oxide Conductors in Pbo-Bi2o3-M2o5 (M = V, P, As)
title_sort synthesis and characterization of oxide conductors in pbo-bi2o3-m2o5 (m = v, p, as)
publishDate 2004
url http://psasir.upm.edu.my/id/eprint/62/1/1000548970_t_FSAS_2004_13.pdf
http://psasir.upm.edu.my/id/eprint/62/
_version_ 1643821733136826368
score 13.211869

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