Effect of CuO on the sintering and cryogenic microwave characteristics of (Zr 0.8 Sn 0.2) TiO4 ceramics
Pamu, D., Narayana Rao, G.L., James Raju, K.C., and Jacob, Mohan V. (2007) Effect of CuO on the sintering and cryogenic microwave characteristics of (Zr 0.8 Sn 0.2) TiO4 ceramics. Science and Technology of Advanced Materials, 8 (6). pp. 469-476.
|PDF - Repository staff only - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader|
View at Publisher Website: http://dx.doi.org/10.1016/j.stam.2007.07...
The effect of CuO on the sintering temperature, microstructure and microwave dielectric properties of (Zr0.8Sn0.2)TiO4 (ZST) modified with 1 wt% of ZnO has been investigated. Microwave dielectric properties of ZST ceramics are measured from cryogenic to room temperatures (15–290 K). Crystallite sizes of sintered ZST ceramics as derived from XRD are in the 30–50 nm range. The addition of CuO effectively reduced the sintering temperature to 1300 °C, possibly due to liquid-phase effects. Addition of CuO did not cause any secondary phases up to 1.5 wt% of CuO. The dielectric constant (epsilonr) and temperature coefficient of resonant frequency (τf) of ZST ceramics do not significantly vary with temperature, whereas the unloaded quality factor (Qu) changes noticeably. It is found that the Qu factor of the sample without CuO decreased with increase in temperature, whereas the samples with addition of CuO up to 1.0 wt% showed less dependence on temperature. The Qu factor of CuO-free ZST is 15,000 and that of ZST with 0.5 wt% of CuO is 11,800 at 15 K. The Qu factor while measured at room temperature ranged between 2900 and 7000. Efforts were made to understand whether the increase in Qu factor at both cryogenic and room temperatures is the result of intrinsic or extrinsic factors.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||dielectric materials; permittivity; low temperature; microwave characterisation; loss tangent; dielectric resonators|
|FoR Codes:||09 ENGINEERING > 0912 Materials Engineering > 091208 Organic Semiconductors @ 100%|
|SEO Codes:||82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8299 Other Plant Production and Plant Primary Products > 829999 Plant Production and Plant Primary Products not elsewhere classified @ 50%|
86 MANUFACTURING > 8616 Computer Hardware and Electronic Equipment > 861603 Integrated Circuits and Devices @ 30%
87 CONSTRUCTION > 8799 Other Construction > 879999 Construction not elsewhere classified @ 20%
|Deposited On:||22 Jul 2009 08:37|
|Last Modified:||18 Oct 2013 00:26|
Last 12 Months: 0
|Citation Counts with External Providers:|
Repository Staff Only: item control page