A polymer solution technique for the synthesis of nano-sized Li2TiO3 ceramic breeder powders

Jung, Choong Hwan; Lee, Sang Jin; Kriven, Waltraud M.; Park, Ji Yeon; Ryu, Woo Seog

doi:10.1016/j.jnucmat.2007.05.050

Cited by 26 publications

(13 citation statements)

References 19 publications

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“…To date, much work has already been done on the fabrication of both pellets and pebbles of Li 2 TiO 3 , characterizing tritium releasing behavior and developing the database. Different techniques are routinely utilized to produce Li 2 TiO 3 nanoceramic materials, such as sol-gel [6][7][8][9][10], extrusion spherodization [11,12], wet chemical method [13], solution combustion [14], polymer solution [15] and many more. All these chemical and mettaloorganic methods have drawbacks with respect to large-scale production, reproducibility, maintenance of stoichiometry and homogeneity in composition, and furthermore require extra high-temperature calcinations.…”

Section: mentioning

confidence: 99%

Electrical properties of bulk and nano Li2TiO3 ceramics: A comparative study

et al. 2014

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Nanocrystalline and bulk Li 2 TiO 3 having monoclinic structure were prepared by mechanical alloying as well as conventional ceramic route. Complex 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 contribution. The 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 mechanism. The electrical conductivity measurement of nanocrystalline and bulk Li 2 TiO 3 with temperature shows the negative temperature coefficient of resistance (NTCR) behavior. The activation energy (0.77 eV for nano sample and 0.88 eV for bulk sample) study shows the conduction mechanism in both samples. The low activation energies of the samples suggest the presence of singly ionized oxygen vacancies in the conduction process.

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Section: mentioning

confidence: 99%

Electrical properties of bulk and nano Li2TiO3 ceramics: A comparative study

et al. 2014

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“…Calcination/crystallization atmosphere effect Samples were prepared using drying condition (A) summarized in Table I, which is the standard procedure for the production of ceramic powders by the organic steric entrapment method. [16][17][18][19][20] The effect of atmosphere was tested for samples with two different cation/organic ratios of 4:1 and 2:1. Figure 2 and Fig.…”

Section: Resultsmentioning

confidence: 99%

“…[16][17][18][19][20] The chemistry of the precursor solution differs from other solutionpolymerization techniques. The stabilization of the cations in the precursor is established not only through the chemical (hydrogen) binding of cations with the functional groups but also, in major part, through the physical entrapment of the metal ions in the network of the dried polymer carrier.…”

Section: Introductionmentioning

confidence: 99%

“…[16][17][18][19][20] So far, the polymerized organic-inorganic entrapment route leads the synthesis reaction toward the maximum oxidation state, and it is considerable challenge to find a way to control the different oxidation states through this synthesis route, which can be useful to produce a wide range of technologically important compounds.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of LiFePO₄ powder by the organic–inorganic steric entrapment method

Ribero

Kriven

2015

J. Mater. Res.

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A nanoscale and pure, olivine-structured LiFePO 4 was synthesized at ;300°C using an organic-inorganic steric entrapment method. Normally, when calcined and crystallized in air, this method leads to the synthesis of compounds where the cations are in their highest oxidation state. However, in this study, we found a way to produce compounds having lower oxidation states (e.g., compounds containing Fe 21 ), which may have wider applications in the synthesis of other compounds with complex chemistry that have variable oxidation states and, therefore, potential applications in electronic ceramics. The resulting LiFePO 4 or (Li 2 OÁ2FeOÁP 2 O 5 ) was characterized by thermogravimetric analysis/differential thermal analysis, x-ray diffractometry, scanning electron microscopy, transmission electron microscopy, inductively coupled plasma emission spectroscopy, specific surface area by Brunauer-Emmett-Teller nitrogen absorption, and particle size analysis.

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“…These entrapped pores do not get removed during any additional sintering process. So, densification should take place at a relatively low temperature before a rapid grain growth sets in [20]. Hence, in order to study the effect of sintering temperature on the densification behavior of milled Li 2 TiO 3 powder, the green compacts were sintered at temperatures varying from 1050 to 1200°C, respectively.…”

Section: Sintering Behavior Of LI 2 Tiomentioning

confidence: 99%