Dielectric properties of 0.7BaO·0.3SrO·(1 − y)TiO2·yNb2O5 composite ceramics

NiO-BaTiO 3 composites were prepared by sintering BaTiO 3 together with NiO in air at 1300°C. Microstructure and morphology of the composites were detected by XRD and SEM, and the dielectric properties were measured by LCZ meter. The results indicate that the perovskite phase is formed in fact in status of solid solution doped with Ni 2+ , although only a small amount of Ni ions can dissolve into the perovskite phase. Ni doping decreases the formation temperature of the composite without inhibiting the grain growth of the crystalline phase. The dielectric constant decreases sharply and the dielectric loss decreases smoothly with increasing Ni 2+ below NiO addition of 0.5 wt.%. When NiO addition increases above 0.5 wt.%, the dielectric constant and loss correlate with mixing rule of the two phases. Meanwhile, the replacement of Ni 2+ for Ti 4+ decreases the Curie temperature of perovskite phase by 30°C.

show abstract

“…It is very similar with that shown in another system [10,11]. The peak position of the perovskite phase is hence low angle shifted as doping NiO.…”

Section: Methodssupporting

confidence: 87%

Effect of doped Ni2+ on the dielectric properties of NiO-BaTiO3 composites

Huang

Weng

et al. 2007

J Electroceram

View full text Add to dashboard Cite

show abstract

“…With the content of MnO 2 increasing, the Curie point of the perovskite phase decreases for more defects are made in its structure. The peak of dielectric constant appeared between 160 ℃ and 360 ℃ for any of the samples is generated by the ferroelectric/paraelectric phase transition of the tungsten bronze phase [6] . The phase transition of the tungsten bronze phase will be affected by the perovskite phase [7] .…”

mentioning

confidence: 96%

“…That is to say that the crystal interplanar distance of the perovskite phase increased, while that of the tungsten bronze phase decreased as the addition of Mn increased. MnO 2 will be decomposed to Mn 2 O 3 and O 2 at 535 ℃ , and the Mn 2 O 3 will be stable until to 940 ℃ [6,7] . So, the Mn may be doped in BSTN composite ceramics in the form of Mn 3+ .…”

mentioning

confidence: 99%

Formation and dielectric properties of Mn-Doped BSTN composite ceramics

Zhou

Cheng

2010

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

View full text Add to dashboard Cite

“…It has been found that the size and type of the substituting ions in different positions have a very important influence on the dielectric properties of the capacitors. [4][5][6][7] . La 3+ ions dissolved in the A-sites and effectively suppressed the grain growth of BST ceramics 8,9 .…”

mentioning

confidence: 99%