Substituted Bi3.5Mg1.8Nb2.7O13.8 pyrochlores with transition metals (Zn, Ni and Cd): Doping mechanism, structure and electrical properties

The influence of transition metals (Zn, Cd and Ni) on bismuth magnesium niobate (Bi3.5Mg1.8Nb2.7O13.8, BMN) pyrochlores was investigated. Considering the difference in their ionic radii, Cd was postulated to substitute Mg at the eight-fold coordinated A-site whereas Zn and Ni were to replace Mg at t...

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Published inProcessing and Application of Ceramics Vol. 18; no. 3; pp. 281 - 289
Main Authors Tan, Phei, Tan, Kar, Khaw, Chwin, Ananda, Murthy, Balachandran, Ruthramurthy, Chen, Soo, Lee, Jew, Chan, Kah, Lu, Ming
Format Journal Article
LanguageEnglish
Published University of Novi Sad 01.09.2024
Subjects
bi/mg niobate
capacitors
dielectric properties
impedance spectroscopy
solid state synthesis
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Abstract The influence of transition metals (Zn, Cd and Ni) on bismuth magnesium niobate (Bi3.5Mg1.8Nb2.7O13.8, BMN) pyrochlores was investigated. Considering the difference in their ionic radii, Cd was postulated to substitute Mg at the eight-fold coordinated A-site whereas Zn and Ni were to replace Mg at the six-fold coordinated B-sites of the host structure. Solubility limits in these substitutional pyrochlore solid solutions were determined to be 0.4, 0.1 and 0.3 for Zn, Ni and Cd, respectively. Upon introducing these divalent cation dopants, notable changes in the lattice parameters and grain sizes were observed with increasing dopant concentration. The high dielectric constants, ?? of Zn, Cd and Ni doped BMN pyrochlores were discernible with their bulk values of 195-216, 173-195 and 153-195, respectively. The highest ?? of 216 was recorded for the composition with Zn = 0.1 in contrast to the lowest value of 153 found in the composition with Ni = 0.1. Meanwhile, these highly insulating divalent cation doped BMN pyrochlores also exhibit low dielectric losses, tan _ whose values are in the order of 10?3. The excellent dielectric properties allow these novel pyrochlore phases to be potentially applied for the energy storage applications.
AbstractList The influence of transition metals (Zn, Cd and Ni) on bismuth magnesium niobate (Bi3.5Mg1.8Nb2.7O13.8, BMN) pyrochlores was investigated. Considering the difference in their ionic radii, Cd was postulated to substitute Mg at the eight-fold coordinated A-site whereas Zn and Ni were to replace Mg at the six-fold coordinated B-sites of the host structure. Solubility limits in these substitutional pyrochlore solid solutions were determined to be 0.4, 0.1 and 0.3 for Zn, Ni and Cd, respectively. Upon introducing these divalent cation dopants, notable changes in the lattice parameters and grain sizes were observed with increasing dopant concentration. The high dielectric constants, ?? of Zn, Cd and Ni doped BMN pyrochlores were discernible with their bulk values of 195-216, 173-195 and 153-195, respectively. The highest ?? of 216 was recorded for the composition with Zn = 0.1 in contrast to the lowest value of 153 found in the composition with Ni = 0.1. Meanwhile, these highly insulating divalent cation doped BMN pyrochlores also exhibit low dielectric losses, tan _ whose values are in the order of 10?3. The excellent dielectric properties allow these novel pyrochlore phases to be potentially applied for the energy storage applications.
The influence of transition metals (Zn, Cd and Ni) on bismuth magnesium niobate (Bi3.5Mg1.8Nb2.7O13.8, BMN) pyrochlores was investigated. Considering the difference in their ionic radii, Cd was postulated to substitute Mg at the eight-fold coordinated A-site whereas Zn and Ni were to replace Mg at the six-fold coordinated B-sites of the host structure. Solubility limits in these substitutional pyrochlore solid solutions were determined to be 0.4, 0.1 and 0.3 for Zn, Ni and Cd, respectively. Upon introducing these divalent cation dopants, notable changes in the lattice parameters and grain sizes were observed with increasing dopant concentration. The high dielectric constants, ε′ of Zn, Cd and Ni doped BMN pyrochlores were discernible with their bulk values of 195-216, 173-195 and 153-195, respectively. The highest ε′ of 216 was recorded for the composition with Zn = 0.1 in contrast to the lowest value of 153 found in the composition with Ni = 0.1. Meanwhile, these highly insulating divalent cation doped BMN pyrochlores also exhibit low dielectric losses, tan _ whose values are in the order of 10−3. The excellent dielectric properties allow these novel pyrochlore phases to be potentially applied for the energy storage applications.
Author Tan, Phei
Ananda, Murthy
Balachandran, Ruthramurthy
Tan, Kar
Chen, Soo
Chan, Kah
Lu, Ming
Khaw, Chwin
Lee, Jew
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  organization: Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, The Joint Laboratory of MXene Materials, Jilin Normal University, Changchun, Jilin, PR China
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Snippet The influence of transition metals (Zn, Cd and Ni) on bismuth magnesium niobate (Bi3.5Mg1.8Nb2.7O13.8, BMN) pyrochlores was investigated. Considering the...
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capacitors
dielectric properties
impedance spectroscopy
solid state synthesis
Title Substituted Bi3.5Mg1.8Nb2.7O13.8 pyrochlores with transition metals (Zn, Ni and Cd): Doping mechanism, structure and electrical properties
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