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Effect of Li^(+)ion mobility on the grain boundary conductivity of Li_(2)TiO_(3) nanoceramics

Journal of Advanced Ceramics 2014年第2期3卷 98-108页

作者： umasankar dash Subhanarayan SAHOO S.K.S.PARASHAR Paritosh CHAUDHURI School of Applied Sciences KIIT University Bhubaneswar-751024India Department of Electrical and Electronics Engineering Trident Academy of TechnologyBhubaneswar-751024India Institute for Plasma Research BhatGandhinagarGujurat-382428India

Lithium titanate(Li_(2)TiO_(3))is one of the most promising candidates among the tritium breeding materials because of its good tritium release *** concentration has much significance on the diffusivity of tritium in the *** nanocrystalline single-phase Li_(2)TiO_(3) with monoclinic structure has been prepared by high energy ball milling followed by calcination at 700℃for 2 *** field emission scanning electron microscopy(FESEM)studies confirmed uniform distribution of nanocrystalline phase with particle size below 100 *** study of the Li^(+)ion diffusion on the sintered sample was investigated by means of electrical conductivity *** properties of the samples were studied in wide temperature(50-500℃)and frequency(100 Hz-1 MHz)*** complex impedance spectroscopy(CIS)studies showed the presence of both bulk and grain boundary effects in nanocrystalline Li_(2)TiO_(3).The bulk resistance of the samples has been observed to decrease with rise in temperature showing a typical negative temperature coefficient of resistance(NTCR)*** low activation energies of the samples suggested the presence of singly ionized oxygen vacancies in the conduction *** hopping frequency shifted toward higher frequency with increase in *** energy of 0.86 eV was calculated from AC conductivity.

关键词： high energy ball milling AC conductivity impedance spectroscopy nanocrystalline

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Electrical properties of bulk and nano Li_(2)TiO_(3) ceramics:A comparative study

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Journal of Advanced Ceramics 2014年第2期3卷 89-97页

作者： umasankar dash Subhanarayan SAHOO Paritosh CHAUDHURI S.K.S.PARASHAR Kajal PARASHAR School of Applied Sciences KIIT UniversityBhubaneswar-751024India Department of Electrical and Electronics Engineering Trident Academy of TechnologyBhubaneswar-751024India Institute for Plasma Research BhatGandhinagar-382428India

Nanocrystalline and bulk Li_(2)TiO_(3) having monoclinic structure were prepared by mechanical alloying as well as conventional ceramic *** impedance analysis in the frequency range of 100 Hz-1 MHz over a wide range of temperature(50-500℃)indicates the presence of grain boundary effect along with the bulk *** frequency-dependent conductivity plots exhibit power law dependence,suggesting three types of conduction in the material:low-frequency(100 Hz-1 kHz)conductivity showing long-range translational motion of electrons(frequency independent),mid-frequency(1-10 kHz)conductivity showing short-range hopping of charge carriers and high-frequency(10 kHz-1 MHz)conductivity showing conduction due to localized orientation of hopping *** electrical conductivity measurement of nanocrystalline and bulk Li_(2)TiO_(3) with temperature shows the negative temperature coefficient of resistance(NTCR)*** activation energy(0.77 eV for nano sample and 0.88 eV for bulk sample)study shows the conduction mechanism in both *** low activation energies of the samples suggest the presence of singly ionized oxygen vacancies in the conduction process.

关键词： nanocrystalline complex impedance spectroscopy(CIS) AC conductivity X-ray diffraction(XRD)

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Frequency and temperature dependent electrical characteristics of CaTiO_(3) nano-ceramic prepared by high-energy ball milling

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Journal of Advanced Ceramics 2013年第3期2卷 291-300页

作者： Subhanarayan SAHOO umasankar dash S.K.S.PARASHAR S.M.ALI School of Electrical Engineering KIIT UniversityBhubaneswar 751024India Center for Nanotechnology KIIT UniversityBhubaneswar 751024India School of Applied Sciences KIIT UniversityBhubaneswar 751024India

Nanocrystalline calcium titanate(CT)ceramic has been synthesized by a combination of solid-state reaction and high-energy ball *** nano-ceramic is characterized by X-ray diffraction(XRD),dielectric study and impedance *** XRD pattern shows single phase ceramic of orthorhombic *** frequency-dependent dielectric study shows that the dielectric constant is maximized at low frequencies and decreases with an increase in *** spectroscopy analyses reveal a non-Debye type relaxation phenomenon.A significant shift in impedance loss peaks toward the higher-frequency side indicates conduction in the material favoring the long-range motion of mobile charge *** grain conduction effect is observed from the complex impedance spectrum by the appearance of one semicircular arc in Nyquist *** is also observed that the resistance decreases with an increase in temperature showing a negative temperature coefficient of resistance(NTCR).Various thermistor parameters have been calculated by fitting with Steinhart-Hart *** modulus plots represent the presence of temperature-dependent electrical relaxation phenomenon with the *** frequency-dependent AC conductivity at different temperatures indicates that the conduction process is thermally *** activation energy has been calculated from an Arrhenius plot of DC conductivity and relaxation frequency.

关键词： high-energy ball milling dielectric study impedance spectroscopy thermistor conductivity

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