<abstract xmlns="http://www.w3.org/1999/xhtml">Polycrystalline yttrium barium cobaltite (YBaCo4O7) powdered sample was prepared by conventional solid state reaction route using high purity yttrium oxide, barium carbonate and cobalt oxide. The as-prepared sample was characterized by XRD diffraction, SEM/EDAX, Raman analytical techniques, resistivity and magnetization measurements for structural, morphological, electrical and magnetic properties assessment. XRD pattern confirms the single phase formation of the sample without any impurity. SEM image shows the hexagonal growth of the crystal and EDAX spectrum reveals stoichiometric composition of as prepared sample. The variation in electrical resistivity from 90 K to 300 K follows the variable range hopping conductivity mechanism. The strong broad overlapped Raman peaks of Co–O and Y–O stretching and bending vibrations of tetrahedral CoO4 with included components of YO6 of octahedral symmetry are obtained at 542 cm−1, 486 cm−1 and 636 cm−1, 436 cm−1, respectively. DC magnetic susceptibility exhibits very weak ferromagnetism below 80 K and does not obey Curie-Weiss law.</abstract>

Polycrystalline yttrium barium cobaltite (YBaCo4O7) powdered sample was prepared by conventional solid state reaction route using high purity yttrium oxide, barium carbonate and cobalt oxide. The as-prepared sample was characterized by XRD diffraction, SEM/EDAX, Raman analytical techniques, resistivity and magnetization measurements for structural, morphological, electrical and magnetic properties assessment. XRD pattern confirms the single phase formation of the sample without any impurity. SEM image shows the hexagonal growth of the crystal and EDAX spectrum reveals stoichiometric composition of as prepared sample. The variation in electrical resistivity from 90 K to 300 K follows the variable range hopping conductivity mechanism. The strong broad overlapped Raman peaks of Co–O and Y–O stretching and bending vibrations of tetrahedral CoO4 with included components of YO6 of octahedral symmetry are obtained at 542 cm−1, 486 cm−1 and 636 cm−1, 436 cm−1, respectively. DC magnetic susceptibility exhibits very weak ferromagnetism below 80 K and does not obey Curie-Weiss law.

Structural, electrical and magnetic features of Kagomé YBaCo4O7 system

Department of Physics, Barkatullah University, Bhopal 462026,

Department of Physics, Jamia Millia Islamia, New Delhi 110025,

CSIR-National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi 110012,

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Structural, electrical and magnetic features of Kagomé YBaCoO system

Polycrystalline yttrium barium cobaltite (YBaCo4O7) powdered sample was prepared by conventional solid state reaction route using high purity yttrium oxide,...

Atom	Atom site multiplicity	X	Y	Z	Occupancy
Y	2b	0.66667	0.33334	0.87855	0.16667
Ba	2b	0.66667	0.33334	0.50000	0.16667
Co₁	2a	0.00000	0.00000	0.44028	0.16667
Co₂	6c	0.18987	0.85218	0.67724	0.50000
O₁	6c	0.38893	0.47100	0.71181	0.50000
O₂	2a	0.00000	0.00000	0.22156	0.16667
O₃	6c	0.12436	0.80951	0.54566	0.50000

Element	wt.%	at.%
O K	30.42	68.66
Co K	29.01	17.77
Y L	20.27	8.23
Ba L	20.30	5.34
Total	100.00	100.00

Structural, electrical and magnetic features of Kagomé YBaCo₄O₇ system

Publicado en línea: 23 dic 2016

Páginas: 786 - 793

Recibido: 13 feb 2016

Aceptado: 25 oct 2016

DOI: https://doi.org/10.1515/msp-2016-0122

Palabras clave
scanning electron microscopy (SEM), XRD analysis, DC magnetic susceptibility

© Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

YBaCo4O7 different XRD parameters; space group - P63mc, a = 6.2874 Å, c = 10.2533 Å, volume = 660.9953 Å3, χ2 = 1.351, Rwp = 19.5, Rexp = 16.7.

Elemental composition details in wt.% and at.% of YBaCo4O7 obtained from EDX pattern.

Structural, electrical and magnetic features of Kagomé YBaCo4O7 system

Publicado en línea: 23 dic 2016

Páginas: 786 - 793

Recibido: 13 feb 2016

Aceptado: 25 oct 2016

DOI: https://doi.org/10.1515/msp-2016-0122

Palabras clavescanning electron microscopy (SEM), XRD analysis, DC magnetic susceptibility

© Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

YBaCo4O7 different XRD parameters; space group - P63mc, a = 6.2874 Å, c = 10.2533 Å, volume = 660.9953 Å3, χ2 = 1.351, Rwp = 19.5, Rexp = 16.7.

Elemental composition details in wt.% and at.% of YBaCo4O7 obtained from EDX pattern.

Structural, electrical and magnetic features of Kagomé YBaCo₄O₇ system

Palabras clave
scanning electron microscopy (SEM), XRD analysis, DC magnetic susceptibility