2016
DOI: 10.1088/1674-1056/25/12/128201
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Electrical and dielectric properties of Na 1/2 La 1/2 Cu 3 Ti 4 O 12 ceramics prepared by high energy ball-milling and conventional sintering

Abstract: We report on the measurements of the electrical and dielectric properties of Na 1/2 La 1/2 Cu 3 Ti 4 O 12 (NLCTO) ceramics prepared by high energy ball-milling and conventional sintering without any calcination steps. The x-ray powder diffraction analysis shows that pure perovskite-like CCTO phase is obtained after sintering at 1025 • C-1075 • C. Higher sintering temperatures result in multi-phase ceramics due to thermal decomposition. Scanning electron microscope observations reveal that the grain size is in … Show more

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Cited by 14 publications
(9 citation statements)
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“…Moreover, the sample S-900 showed the best compromise between the minimum tan δ (~0.39) and colossal ε′ (~1420) at 200 kHz. The dielectric constant of SPS NLCTO ceramics is comparable with the literature values [ 22 , 23 ]. Meanwhile, their dielectric losses are noticeably high compared to literature values.…”
Section: Resultssupporting
confidence: 86%
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“…Moreover, the sample S-900 showed the best compromise between the minimum tan δ (~0.39) and colossal ε′ (~1420) at 200 kHz. The dielectric constant of SPS NLCTO ceramics is comparable with the literature values [ 22 , 23 ]. Meanwhile, their dielectric losses are noticeably high compared to literature values.…”
Section: Resultssupporting
confidence: 86%
“…As a result, ε′ decreases due to the reduced polarizability. Moreover, the values of resistivity of the grain boundary for SPS NLCTO ceramics is less than the reported values for NLCTO ceramics prepared by other techniques [ 22 , 23 ]. This result explains the comparatively higher dielectric loss of the SPS NLCTO.…”
Section: Resultsmentioning
confidence: 66%
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“…According to this model, the apparent giant dielectric constant arises due to the Maxwell-Wagner polarization effects at internal resistive boundaries such as grain-boundaries and/or domain-boundaries. Recently, a great deal of studies on the effects of doping, powder synthesis and sintering techniques on the dielectric properties of CCTO has been carried out [2][3][4][10][11][12][13][14][15][16]. Most of these studies used the solid state reaction (SSR) technique for the fabrication of ceramics.…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, research continues for better understanding and improving the dielectric response of CCTO, and to suggest alternative colossal permittivity dielectric materials. In this regard, several strategies are being implemented, such as doping, substitution, and controlling synthesis conditions [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. In particular, cosubstitution for Ti 4+ with heterovalent elements was reported as a promising technique to reduce tanδ without degrading the ε’ of TiO 2 and CCTO ceramics [ 12 , 18 , 19 , 20 , 21 ].…”
Section: Introductionmentioning
confidence: 99%