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您的检索式：作者名="K.B.R.Varma"
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| 1 | Effect of TeO_(2) addition on the dielectric properties of CaCu_(3)Ti_(4)O_(12) ceramics derived from the oxalate precursor route显示文摘CaCu_(3)Ti_(4)O_(12)(CCTO)ceramics which has perovskite structure gained considerable attention due to its giant permittivity.But it has high tan(0.1 at 1 kHz)at room temperature,which needs to be minimized to the level of practical applications.Hence,TeO_(2) which is a good glass former has been deliberately added to CCTO nanoceramic(derived from the oxalate precursor route)to explore the possibility of reducing the dielectric loss while maintaining the high permittivity.The structural,morphological and dielectric properties of the pure CCTO and TeO_(2) added ceramics were studied using X-ray diffraction,Scanning Electron Microscope along with Energy Dispersive X-ray Analysis(EDX),spectroscopy and Impedance analyzer.For the 2.0 wt.%TeO_(2) added ceramics,there is a remarkable difference in the microstructural features as compared to that of pure CCTO ceramics.This sample exhibited permittivity values as high as 7387 at 10 KHz and low dielectric loss value of 0.037 at 10 kHz,which can be exploited for the high frequency capacitors application. | P.Thomas K.B.R.Varma | 2013 | Journal of Advanced Dielectrics2013，3，4： | 0 |
| 2 | STRUCTURAL AND DIELECTRIC PROPERTIES OF GLASSES IN THE SYSTEM TeO_(2)-CaCu_(3)Ti_(4)O_(12)显示文摘The glasses in the system(100-x)TeO_(2)-xCaCu_(3)Ti_(4)O_(12),(x=0.25 mol.%to 3 mol.%)were fabricated.The color varied from olive green to brown as the CaCu_(3)Ti_(4)O_(12)(CCTO)content increased in TeO_(2) matrix.The X-ray powder diffraction and differential scanning calorimetric analyses that were carried out on the as-quenched samples confirmed their amorphous and glassy nature respectively.The dielectric constant and loss in the 100Hz1MHz frequency range were monitored as a function of temperature(50-400℃).The dielectric constant(ε′_(τ))and the loss(D)increased as the CCTO content increased in TeO_(2) at all the frequencies and temperatures under investigation.Further,the ε′_(τ) and D were found to be frequency-independent in the 50-200℃ temperature range.The value obtained for the loss at 1MHz was 0.0019 which was typical of low loss materials,and exhibited near constant loss(NCL)in the 100Hz-1MHz frequency range.The electrical relaxation was rationalized using the electric modulus formalism.These glasses may be of considerable interest as substrates for high frequency circuit elements in conventional semiconductor industries owing to their high thermal stability. | P.THOMAS K.B.R.VARMA | 2012 | Journal of Advanced Dielectrics2012，2，4： | 0 |
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