01418nas a2200205 4500008004100000022001400041245008100055210006900136260006900205300001200274490000800286520070600294653001201000653001601012653002401028100002001052700001601072700001201088856011201100 2005 eng d a0921-510700aPreparation of nanocrystalline ferroelectric CaBi2TaO9 by citrate gel method0 aPreparation of nanocrystalline ferroelectric CaBi2TaO9 by citrat aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAR a159-1610 v1173 a

A gel was formed when an aqueous solution of CaCl2, BiCl3, TaF5 and citric acid in stoichiometric ratio is heated on a water bath. This gel on decomposition at 600degreesC yielded the nano-crystallites of ternary oxide, CaBi2Ta2O9 (CBT) as confirmed by X-ray diffraction study (XRD). Particle size and morphology was studied by transmission electron spectroscopy (TEM). Ferroelectric hysteresis loop parameters such as remnant polarization (P-r) and coercive field (E-C) are also determined. TEM investigations revealed that the average particle size of the polycrystalline powder is 40 nm. The room temperature dielectric constant was found to be 90. (C) 2004 Elsevier B.V All rights reserved.

10aBismuth10adiffraction10aElectron microscopy1 aGaikwad, S., P.1 aPasricha, R1 aRavi, V uhttps://library.ncl.res.in/content/preparation-nanocrystalline-ferroelectric-cabi2tao9-citrate-gel-method-001882nas a2200241 4500008004100000022001400041245009200055210006900147260006900216300001000285490000800295520101100303653001301314653002001327653001601347653002401363653002601387100002501413700002601438700002901464700002201493856012501515 2005 eng d a0921-510700aRapid hydrothermal synthesis route for nanocrystalline SrZrO3 using reactive precursors0 aRapid hydrothermal synthesis route for nanocrystalline SrZrO3 us aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAY a87-930 v1193 a

Synthesis of nanocrystalline, orthorhombic (space group Pnma) SrZrO3 was achieved using appropriate molar proportions of nitrate salts of strontium and zirconium as precursors. Formation of SrZrO3 (SZ) was facilitated hydrothermally in time period as less as half-an-hour, in aqueous medium with alkaline pH as confirmed by XRD. Sample characterization was performed by FT-IR spectroscopy; powder XRD, SEM, TEM and DSC. The results have been explained by proposing a suitable reaction mechanism based on the step-wise analysis of the reaction intermediates using FT-IR as well as XRD. A double cation hydroxide composite formation is anticipated that under hydrothermal conditions results in the formation of SrZrO3. Morphology of the samples was determined with the help of SEM and TEM. The particle size distribution as seen from the TEM micrograph lies in the range of 15-25 nm. Heats of reaction for different decomposition steps were obtained by DSC. (c) 2005 Elsevier B.V. All rights reserved.

10aCeramics10aCrystallization10adiffraction10aElectron microscopy10ainfrared spectroscopy1 aAthawale, Anjali, A.1 aChandwadkar, Asha, J.1 aKarandikar, Prashant, R.1 aBapat, Malini, S. uhttps://library.ncl.res.in/content/rapid-hydrothermal-synthesis-route-nanocrystalline-srzro3-using-reactive-precursors-003415nas a2200289 4500008004100000245009600041210006900137260000800206490000600214520247900220653001402699653003902713653002502752653001602777653002402793653003602817653001202853653002202865653002302887100001402910700001402924700001902938700001402957700001902971700001402990856012103004 2017 eng d00aNutty carbon: morphology replicating hard carbon from walnut shell for na ion battery anode0 aNutty carbon morphology replicating hard carbon from walnut shel cJUL0 v23 a
Abstract Image

Efficient Na ion intercalation/deintercalation in the semigraphitic lattice of a hard carbon derived from the walnut shell is demonstrated. High-temperature (1000 °C) pyrolysis of walnut shells under an inert atmosphere yields a hard carbon with a low surface area (59 m2 g–1) and a large interplanar c axis separation of 0.39–0.36 nm as compared to 0.32 nm for graphite, suitable for Na ion intercalation/deintercalation. A stable reversible capacity of 257 mAh g–1 is observed at a current density of 50 mA g–1 for such nutshell-derived carbon (NDC) with an impressive rate performance. No loss of electrochemical performance is observed for high current cycling (100 mA g–1 → 2 A g–1 → 100 mA g–1). Additionally, the NDC shows remarkably stable electrochemical performance up to 300 charge–discharge cycles at 100 mA g–1 with a minimal drop in capacity.

10aBatteries10aBiological and Medicinal chemistry10aBiological materials10adiffraction10aElectric Properties10aElectrode-electrolyte interface10aspectra10aSurface structure10aThermal properties1 aWahid, M.1 aGawli, Y.1 aPuthusseri, D.1 aKumar, A.1 aShelke, M., V.1 aOgale, S. uhttps://library.ncl.res.in/content/nutty-carbon-morphology-replicating-hard-carbon-walnut-shell-na-ion-battery-anode