Effects of strontium/lanthanum co-doping on the dielectric properties of CaCu3Ti4O12 prepared by reactive sintering
Source abstract
Abstract
Abstract The extremely high dielectric constant of the cubic perovskite CaCu3Ti4O12 (CCTO) has attracted increasing attention for a variety of capacitive elements in microelectronic device applications. In this research, the influence of Sr and La replacing Ca and Cu, respectively, to simultaneously controlling the intrinsic properties of grain boundaries in a co-doped CCTO ceramic has been investigated. The preparation was done using high purity compounds milled and mixed by mechano-synthesis and further consolidated by reactive sintering without calcination. Characterization by XRD confirmed the formation of single-phase CCTO ceramic and a residual amount CaTiO3. The microstructure and composition analyzed by SEM/EDX showed a smaller grain size for the co-doped CCTO. Impedance measurements indicated the smallest dielectric loss for the co-doped ceramics compare to pure and single-doped CCTO, while reaching a higher dielectric permittivity than single-doped ceramics. The CCTO-SrLa sample also showed high thermal stability of the dielectric permittivity between 100 and 470 K, and the lowest loss between 200 and 300 K. This behavior was attributed to the lower bulk resistance exhibited by the co-doped sample.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Dielectric properties of ceramics · Ferroelectric and Piezoelectric Materials · Microwave Dielectric Ceramics Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (38)
Show source-provided references
1. The route to resource-efficient novel materials10.1038/nmat3180 ↗
2. Grain size effects on the dielectric properties of CaCu3Ti4O12 ceramics for supercapacitor applications10.1016/j.ceramint.2015.04.109 ↗
3. Dwell time effect on the barrier layer capacitor structure10.1016/j.ceramint.2015.06.072 ↗
4. Strong nonlinear current-voltage behaviour in perovskite-derivative calcium copper titanate10.1038/nmat1238 ↗
5. Lattice dielectric response of CdCu3Ti4O12 and CaCu3Ti4O12 from first principles10.1103/PhysRevB.67.012103 ↗
6. CaCu3Ti4O12: one-step internal barrier layer capacitor
7. Giant dielectric constant response in a copper-titanate10.1016/S0038-1098(00)00182-4 ↗
8. Nonintrinsic origin of the colossal dielectric constants in CaCu3Ti4O1210.1103/PhysRevB.70.172102 ↗
9. Influence of Mn doping on the semiconducting properties of CaCu3Ti4O12 ceramics10.1063/1.2200732 ↗
10. Site-selectivity of 3d metal cation dopants and dielectric response in calcium copper titanate10.1063/1.2179110 ↗
11. Decrease of dielectric loss in CaCu3Ti4O12 ceramics by La doping
12. Effect of La-doping on the properties of CaCu3Ti4O12 dielectric ceramics10.1016/j.ceramint.2007.10.007 ↗
13. Rare earth doped CaCu3Ti4O12 electronic ceramics for high frequency applications10.1016/S1002-0721(09)60048-X ↗
14. Dielectric properties and current–voltage nonlinear behavior of Ca1−xSrxCu3Ti4O12 ceramics10.1016/j.jallcom.2009.03.190 ↗
15. High permittivity and low dielectric loss of the Ca1−xSrxCu3Ti4O12 ceramics10.1016/j.jallcom.2011.06.039 ↗
16. Selectivity of doping ions to effectively improve dielectric and non-ohmic properties of CaCu3Ti4O12 ceramics10.1016/j.ceramint.2013.03.086 ↗
17. Effect of tantalum substitutions on microstructures and dielectric properties of calcium copper titanate (CaCu3Ti4O12) ceramic10.1016/j.mseb.2012.06.002 ↗
18. Effect of doping ions on the structural defect and the electrical behavior of CaCu3Ti4O12 ceramics10.1016/j.materresbull.2015.12.020 ↗
19. A novel approach to achieve high dielectric permittivity and low loss tangent in CaCu3Ti4O12 ceramics by co-doping with Sm3+ and Mg2+ ions10.1016/j.jeurceramsoc.2015.06.008 ↗
20. Improved dielectric properties of (Y + Mg) co-doped CaCu3Ti4O12 ceramics by controlling geometric and intrinsic properties of grain boundaries10.1016/j.matdes.2015.12.042 ↗
21. Colossal dielectric permittivity and electrical properties of the grain boundary of Ca1-3x/2YbxCu3-yMgyTi4O12 (x = 0.05, y = 0.05 and 0.30)10.1016/j.ceramint.2016.02.067 ↗
22. Microstructure and enhanced dielectric properties of yttrium and zirconium co-doped CaCu3Ti4O12 ceramics10.1016/j.matchemphys.2017.01.015 ↗
23. Dielectric properties of CaCu3Ti4O12 improved by chromium/lanthanum co-doping10.1016/j.ceramint.2012.02.005 ↗
24. Structural and dielectric properties of A- and B-sites doped CaCu3Ti4O12 ceramics10.1016/j.ceramint.2015.04.138 ↗
25. Dielectric behaviour of Hf-doped CaCu3Ti4O12 ceramics obtained by conventional synthesis and reactive sintering10.1016/j.jeurceramsoc.2012.01.024 ↗
26. Mechanochemical processing of CaCu3Ti4O12 with giant dielectric properties10.1080/10426914.2014.921702 ↗
27. Co-doping effects of A-site Y3+ and B-site Al3+ on the microstructures and dielectric properties of CaCu3Ti4O12 ceramics10.1016/j.jeurceramsoc.2017.06.046 ↗
28. A novel approach to achieve high dielectric permittivity and low loss tangent in CaCu3Ti4O12 ceramics by co-doping with Sm3+ and Mg2+ ions10.1016/j.jeurceramsoc.2015.06.008 ↗
29. Significantly enhanced breakdown field in Ca1-xSrxCu3Ti4O12 ceramics by tailoring donor densities10.1016/j.jeurceramsoc.2017.11.018 ↗
30. (Al3+, Nb5+) co–doped CaCu3Ti4O12: an extended approach for acceptor–donor heteroatomic substitutions to achieve high–performance giant–dielectric permittivity10.1016/j.jeurceramsoc.2017.08.040 ↗
31. Enhanced non-Ohmic properties and giant dielectric response of (Sm+Zn) co-doped CaCu3Ti4O12 ceramics10.1016/j.ceramint.2017.06.159 ↗
32. Role of oxygen on the phase stability and microstructure evolution of CaCu3Ti4O12 ceramics10.1016/j.jeurceramsoc.2016.07.039 ↗
33. Structural and dielectric properties of A- and B-sites doped CaCu3Ti4O12 ceramics10.1016/j.ceramint.2015.04.138 ↗
34. Effect of synthesizing temperatures on the microstructure and electrical property of CaCu3Ti4O12 ceramics prepared by sol-gel process10.1016/j.jallcom.2016.05.177 ↗
35. Modulus spectroscopy of CaCu3Ti4O12 ceramics: clues to the internal barrier layer capacitance mechanism10.1039/c3ra40216a ↗
36. Defects and dc electrical degradation in CaCu3Ti4O12 ceramics: role of oxygen vacancy migration10.1063/1.4720151 ↗
37. Ti deficiency effect on the dielectric response of CaCu3Ti4O12 ceramics10.1016/j.ssc.2006.12.004 ↗
38. Effects of sintering temperature on the internal barrier layer capacitor (IBLC) structure in CaCu3Ti4O12 (CCTO) ceramics10.1016/j.jeurceramsoc.2012.03.040 ↗