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- Title
Effect of NdAlO on microstructure, dielectric properties and temperature-stable mechanism of (Sr, Ca, Nd)TiO ceramics at microwave frequency.
- Authors
Qu, Jingjing; Huang, Delong; Wei, Xing; Liu, Fei; Yuan, Changlai; Qin, Bailin
- Abstract
Microwave dielectric ceramics (1 − x)(SrCaNd)TiO- xNdAlO (abbreviated as SCNTA x hereafter, 0.1 ≤ x ≤ 0.4) were prepared by conventional mixed oxide route, and their phase composition, microstructure and microwave dielectric properties were investigated as a function of the x value and sintering temperatures. A single tilted orthorhombic perovskite structure in space group Pnma was refined in the studied composition range. For microware dielectric properties, the decreasing relative permittivity was strongly affected by the ionic polarizability of Nd and Al in SCNTA x ceramic systems. Also, the quality factor of SCNTA x solid solution had strongly depended on apparent densities and average grain sizes. As expected, the promising ceramic of SCNTA x ( x = 0.25) sintered at 1520 °C for 4 h was found to possess good microwave dielectric properties: a relative permittivity ( ε ) of 55.6, a quality factor ( Q × f) of 25,600 GHz (at 4.249 GHz) and a temperature coefficient of resonant frequency ( τ ) of 6.7 ppm/°C. Especially, the τ values of SCNTA x ceramics were not strongly depended on tolerance factor ( t) with increasing of the NdAlO content, while these τ values were essentially correlated with the B-site bond valence and octahedral tilting. Wherein, either decreasing the B-site bond valence or increasing the octahedral tiltings ( θ and φ) led to a decrease in τ value for the present ceramics.
- Subjects
MICROSTRUCTURE; DIELECTRIC properties; ELECTRONIC ceramics; TITANIUM oxides; MICROWAVES; DIELECTRIC properties of perovskite; POLARIZABILITY (Electricity)
- Publication
Journal of Materials Science: Materials in Electronics, 2016, Vol 27, Issue 10, p11110
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-016-5228-4