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RISS 인기검색어
- 검색키워드
- 저자 : Kulwant S. Thind (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Structural and microwave dielectric properties of Ba6-3xGd8+2xTi18O54 solid-solutions
S.Bindra Narang,Dalveer Kaur,Kulwant Singh Thind 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.5
Ba6-3xGd8+2xTi18O54 (x = 0.0, 0.2 ≤ x ≤ 0.7) composites have been synthesized by employing a solid-state reactive sintering technique and studied from the point of view of microwave dielectric materials. In this series, formation of solid solutions was found, which was deduced from the linear change of the lattice parameters of the unit cells. Unit-cell parameters (Å) have been obtained with the help of the X-Ray powder diffraction (XRD) technique. Multi-phase microstructures have been observed for all the compositions using Scanning electron microscopy (SEM). We found good quality microwave materials which show a high dielectric constant (ε') of 70 and a low loss tangent (tanδ) of 0.006336 at 3 GHz. A minimum value of the A.C. dielectric conductivity (σa.c.) was 2.32E-12 mho/cm at 0.8 GHz. Ba6-3xGd8+2xTi18O54 (x = 0.0, 0.2 ≤ x ≤ 0.7) composites have been synthesized by employing a solid-state reactive sintering technique and studied from the point of view of microwave dielectric materials. In this series, formation of solid solutions was found, which was deduced from the linear change of the lattice parameters of the unit cells. Unit-cell parameters (Å) have been obtained with the help of the X-Ray powder diffraction (XRD) technique. Multi-phase microstructures have been observed for all the compositions using Scanning electron microscopy (SEM). We found good quality microwave materials which show a high dielectric constant (ε') of 70 and a low loss tangent (tanδ) of 0.006336 at 3 GHz. A minimum value of the A.C. dielectric conductivity (σa.c.) was 2.32E-12 mho/cm at 0.8 GHz.
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Electrical and magnetic properties of rare earth substituted strontium hexaferrites
Anterpreet Singh,S. Bindra Narang,Kulwant Singh Thind,O.P. Pandey,R.K. Kotnala 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.2
Samples of strontium ferrite (Sr-M) with different molar substitution concentrations of lanthanum, neodymium and samarium ions were prepared by a standard ceramic processing technique. AC conductivity, dielectric constant and dielectric loss tangent measurements were carried out in the frequency range of 20 Hz to 1MHz. The experimental results indicate that AC electrical conductivity increases with increasing frequency. The increase in AC conductivity with frequency can be explained on the basis of Koops model, whereas the dielectric constant and dielectric loss tangent variations have been explained with a Maxwell-Wagner type interfacial polarization in agreement with the Koops phenomenological theory. The effects of rare earth substitution on the magnetic properties such as the saturation magnetization moment (Ms), coercive field (Hc), remenance (Mr),and Curie temperature Tc (K) have been investigated. It is found that the values of the magnetization moment (Ms), and remenance (Mr) decrease with increasing rare earth ions substitution for all the series. The reason for the decrease may be both the magnetic dilution and spin canting, which promote reduction of superexchange interactions. The enhancement of Hc values may be due to higher magnetocrystalline anisotropy, where Fe2+ ion anisotropy on the 2a site could be dominant in all hexaferrites series.
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Processing, dielectric behavior and conductivity of some complex tungsten-bronze dielectric ceramics
Sukhleen Bindra Narang,Dalveer Kaur,Kulwant S. Thind 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.1
Ceramic samples of a complex structural formula Ba6-3xR8+2xTi18O54, where R is a rare-earth oxide and R=Sm, Nd and Gd and x=0.2-0.7 were prepared by a high temperature solid-state reaction technique. The dielectric properties (i.e. dielectric constant (ε'), dielectric loss (ε'') and Q-factor) have been measured on the sintered disks with respect to the frequency in the range 0.3 GHz-3.0 GHz at room temperature. The dielectric properties of the synthesized samples have been found out to be a function of the wt.% of rare-earth oxides used. Dielectric conductivity (σ) was derived from the dielectric constant and loss tangent data in the same frequency range. Conductivity calculations were carried out based on this derived formula. The capacitance values have been calculated knowing the geometrical dimensions of the samples synthesized.
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