IBLC effect leading to colossal dielectric constant in layered structured Eu2CuO4 ceramic
Dielectric (εr′) studies of phase pure T′-type Eu2CuO4 ceramics of two markedly different grain sizes (D), prepared by (i) conventional powder mixing and (ii) citrate complexation-Pechini process, have been carried out in the frequency range 0.1Hz to 1MHz, and at temperatures −100°C to 150°C. εr′ is...
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| Published in: | Ceramics international Vol. 40; no. 3; pp. 4491 - 4498 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
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Elsevier Ltd
01-04-2014
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| Abstract | Dielectric (εr′) studies of phase pure T′-type Eu2CuO4 ceramics of two markedly different grain sizes (D), prepared by (i) conventional powder mixing and (ii) citrate complexation-Pechini process, have been carried out in the frequency range 0.1Hz to 1MHz, and at temperatures −100°C to 150°C. εr′ is found to be highly grain size dependent. For the sample with coarse bar-like grains (D2~17×6μm2) εr′ is >103, and for the finer grain size sample with bimodal distribution (D1~1μm, D2~3μm) εr′ is ~105; for both the samples, high εr′ value is nearly frequency independent over 500Hz≤f<100kHz and T≥30°C. The impedance spectroscopy (IS) study has clearly shown that both, the coarse- and the fine-grained samples consist of semiconducting grains and insulating grain boundaries that primarily lead to an internal barrier layer capacitance (IBLC) effect. And thus, manifest colossal dielectric constant (εr′>103) in Eu2CuO4 ceramics. The smaller grain size (Pechini) sample, with over an order higher number of grains and grain boundary network, showing over an order higher εr′ (~105) compared to the coarse grained one, further endorses the IBLC effect. |
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| AbstractList | Dielectric (εr′) studies of phase pure T′-type Eu2CuO4 ceramics of two markedly different grain sizes (D), prepared by (i) conventional powder mixing and (ii) citrate complexation-Pechini process, have been carried out in the frequency range 0.1Hz to 1MHz, and at temperatures −100°C to 150°C. εr′ is found to be highly grain size dependent. For the sample with coarse bar-like grains (D2~17×6μm2) εr′ is >103, and for the finer grain size sample with bimodal distribution (D1~1μm, D2~3μm) εr′ is ~105; for both the samples, high εr′ value is nearly frequency independent over 500Hz≤f<100kHz and T≥30°C. The impedance spectroscopy (IS) study has clearly shown that both, the coarse- and the fine-grained samples consist of semiconducting grains and insulating grain boundaries that primarily lead to an internal barrier layer capacitance (IBLC) effect. And thus, manifest colossal dielectric constant (εr′>103) in Eu2CuO4 ceramics. The smaller grain size (Pechini) sample, with over an order higher number of grains and grain boundary network, showing over an order higher εr′ (~105) compared to the coarse grained one, further endorses the IBLC effect. Dielectric (epsilonr') studies of phase pure T'-type Eu2CuO4 ceramics with two markedly different grain sizes (D), prepared by conventional powder mixing and the citrate complexation-Pechini process, were carried out in the frequency range 0.1 Hz to 1 MHz, and at temperatures between -100 to 150 C. Epsilonr' was grain size dependent and for the sample with coarse bar-like grains (D2 approximately 17 x 6 micron2) epsilonr' was > 10 exp(3), and for the finer grained sample with bimodal distribution (D1 about 1 micron, D2 about 3 micron) epsilonr' was approximately 10 exp(5). For both samples, the high epsilonr' value was nearly frequency independent within the parameters of f = 500 Hz to 100 kHz, and T at least 30 C. Impedance spectroscopy showed that both the coarse- and the fine-grained samples consisted of semiconducting grains and insulating grain boundaries that led to an internal barrier layer capacitance (IBLC) effect which resulted in a colossal dielectric constant (epsilonr' > 10 exp(3)) in Eu2CuO4 ceramics. The smaller grain size (Pechini) sample, with over an order higher number of grains and grain boundary network, had over an order higher epsilonr' (about 10 exp(5)) compared to the coarse grained sample, which further endorsed the IBLC effect. |
| Author | Prakash, Om Kulkarni, A.R. Drai, Renangso Salame, Paresh |
| Author_xml | – sequence: 1 givenname: Paresh surname: Salame fullname: Salame, Paresh email: psalame@iitb.ac.in – sequence: 2 givenname: Renangso surname: Drai fullname: Drai, Renangso – sequence: 3 givenname: Om surname: Prakash fullname: Prakash, Om – sequence: 4 givenname: A.R. surname: Kulkarni fullname: Kulkarni, A.R. email: ajit.kulkarni@iitb.ac.in, ajit2957@gmail.com |
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| Snippet | Dielectric (εr′) studies of phase pure T′-type Eu2CuO4 ceramics of two markedly different grain sizes (D), prepared by (i) conventional powder mixing and (ii)... Dielectric (epsilonr') studies of phase pure T'-type Eu2CuO4 ceramics with two markedly different grain sizes (D), prepared by conventional powder mixing and... |
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| SubjectTerms | A. Powders: chemical preparation B. Grain size C. Dielectric properties Ceramics Citrates Complexation Dielectric constant Frequency ranges Grain boundaries Grain size Grains |
| Title | IBLC effect leading to colossal dielectric constant in layered structured Eu2CuO4 ceramic |
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