.png){kind=icon}
.png){kind=icon}
Return
Nontoxic Gelcasting of Nano-SiO2-Doped CCTO Ceramics with Enhanced Dielectric Properties
.png){kind=icon}
PRE
AI
Q
J
Y
W
DOI：10.1007/s11664-026-12829-7.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
The development of calcium copper titanate (CaCu3Ti4O12, CCTO) ceramics is often hindered by their high dielectric loss, which limits practical applications. In this work, CCTO powder with tailored micrometer-sized particles, synthesized via a Na2SO4 molten-salt method, was used to fabricate nano-SiO2-doped ceramics through an environmentally friendly, water-based gelcasting process with glutinous rice flour as a nontoxic binder. This approach enabled stable slurry processing and effective microstructural control. The incorporation of 3.5 wt.% nano-SiO2 yielded optimal dielectric performance, achieving a high dielectric constant of 8091 and a significantly reduced loss tangent of 0.08 at 1 kHz; this represents a 71.4% reduction in loss compared to the undoped sample. Microstructural and electrical analyses confirmed that the nano-SiO2 predominantly segregated at the grain boundaries, forming a continuous amorphous insulating layer. This phase enhanced grain boundary resistivity, optimized the electrical heterogeneity, and substantially improved the frequency and temperature stability of the dielectric properties. This study demonstrates that nontoxic gelcasting combined with nano-SiO2 doping is an effective and sustainable strategy for tailoring the dielectric properties of CCTO ceramics toward high-performance electronic applications by optimizing the internal barrier layer capacitor structure.
Keywords:
Gelcasting
nano-SiO2
CCTO
dielectric properties
Journal
J
IF:
2.5
Papers:
485
Citations:
0
Organization
Cited Papers