9 research outputs found
<span style="font-size:13.0pt;font-family: "Times New Roman";mso-fareast-font-family:"Times New Roman";mso-bidi-font-family: Mangal;mso-ansi-language:EN-GB;mso-fareast-language:EN-US;mso-bidi-language: HI" lang="EN-GB">Effect of glycine concentration on the properties of LaCoO<sub>3</sub> perovskite prepared by the glycine-nitrate process</span>
931-936LaCoO3 nanocrystals have been
prepared by the glycine-nitrate process. The effect of glycine content in the
synthesis solution on various properties of LaCoO3 has been studied
in the glycine-to-nitrate molar ratio between 0.75 and 2.0. The samples are
characterized by X-ray diffraction for phase purity and particle size, by
transmission electron microscopy for particle size, by BET for surface area and
by temperature-programmed reduction for reducibility of Con+. XRD
reflections show the presence of impurities in the as-prepared samples while
only rhombohedral phase could be identified in the samples after calcination at
700 <span style="font-family:Symbol;mso-ascii-font-family:
" times="" new="" roman";mso-hansi-font-family:"times="" roman";mso-char-type:symbol;="" mso-symbol-font-family:symbol"="" lang="EN-GB">°C. For all the glycine-to-nitrate
ratios tested, the particle size estimated from XRD data ranges from 58-69 nm,
which are systematically lower than those determined by BET which ranged from
97-118 nm. TPR profiles of the samples show two major peaks; one due to the
reduction of Co3+ to Co2+ and the other
due to the reduction of Co2+ to Co0. The samples prepared
under fuel-deficient and fuel-rich conditions show higher reducibility as
compared to that of the sample prepared under stoichiometric conditions.
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