Synthesis and characterization of the pyrochlore Bi1.56Sb1.48-xNbxCo0.96O7 solid solution
Identifieur interne : 000079 ( PascalFrancis/Checkpoint ); précédent : 000078; suivant : 000080Synthesis and characterization of the pyrochlore Bi1.56Sb1.48-xNbxCo0.96O7 solid solution
Auteurs : Mayouf Sellami [Algérie] ; Vincent Caignaert [France] ; Ahmed Bekka [Algérie] ; Noureddine Bettahar [Algérie]Source :
- Journal of alloys and compounds [ 0925-8388 ] ; 2010.
Descripteurs français
- Pascal (Inist)
- Wicri :
- geographic : Valence (Drôme).
- topic : Oxyde.
English descriptors
- KwdEn :
Abstract
A new pyrochlore solid solution with formula Bi1.56Sb1.48-xNbxCo0.96O7 has been synthesized using ceramic method at 1000°C. Composition dependencies of cell parameters showed a linear increase with niobium x fraction. The IR-active bands characteristic of A and B sites of pyrochlore compound have been detected by infrared spectroscopy. The magnetic susceptibility measurements achieved between 4 and 300 K indicate a paramagnetic behavior with an oxidation state "+2" for the cobalt ion. The results of dielectric measurements show large dielectric loss due to residual electronic conductivity.
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Sb<sub>1.48-x</sub>
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Co<sub>0.96</sub>
O<sub>7</sub>
solid solution</title>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Synthesis and characterization of the pyrochlore Bi<sub>1.56</sub>
Sb<sub>1.48-x</sub>
Nb<sub>x</sub>
Co<sub>0.96</sub>
O<sub>7</sub>
solid solution</title>
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<series><title level="j" type="main">Journal of alloys and compounds</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Chemical composition</term>
<term>Dielectric losses</term>
<term>Dielectric properties</term>
<term>Infrared spectra</term>
<term>Lattice parameters</term>
<term>Magnetic susceptibility</term>
<term>Oxides</term>
<term>Paramagnetism</term>
<term>Pyrochlore type compound</term>
<term>Residual resistivity</term>
<term>Scanning electron microscopy</term>
<term>Solid solutions</term>
<term>Valence</term>
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<term>Valence</term>
<term>Perte diélectrique</term>
<term>Résistivité résiduelle</term>
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<term>Propriété diélectrique</term>
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<front><div type="abstract" xml:lang="en">A new pyrochlore solid solution with formula Bi<sub>1.56</sub>
Sb<sub>1.48-x</sub>
Nb<sub>x</sub>
Co<sub>0.96</sub>
O<sub>7</sub>
has been synthesized using ceramic method at 1000°C. Composition dependencies of cell parameters showed a linear increase with niobium x fraction. The IR-active bands characteristic of A and B sites of pyrochlore compound have been detected by infrared spectroscopy. The magnetic susceptibility measurements achieved between 4 and 300 K indicate a paramagnetic behavior with an oxidation state "+2" for the cobalt ion. The results of dielectric measurements show large dielectric loss due to residual electronic conductivity.</div>
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Sb<sub>1.48-x</sub>
Nb<sub>x</sub>
Co<sub>0.96</sub>
O<sub>7</sub>
solid solution</s1>
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Sb<sub>1.48-x</sub>
Nb<sub>x</sub>
Co<sub>0.96</sub>
O<sub>7</sub>
has been synthesized using ceramic method at 1000°C. Composition dependencies of cell parameters showed a linear increase with niobium x fraction. The IR-active bands characteristic of A and B sites of pyrochlore compound have been detected by infrared spectroscopy. The magnetic susceptibility measurements achieved between 4 and 300 K indicate a paramagnetic behavior with an oxidation state "+2" for the cobalt ion. The results of dielectric measurements show large dielectric loss due to residual electronic conductivity.</s0>
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