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Featured researches published by Yongni Li.


Rare Metals | 2012

Nanocrystalline ZrO2 preparation and kinetics research of phase transition

Wenwei Wu; Jinchao Cai; Xuehang Wu; Yongni Li; Sen Liao

The precursor of nanocrystalline ZrO2 was synthesized by solid-state reaction at low heat using ZrOCl2·8H2O, and Na2CO3·10H2O as raw materials. The nanocrystalline ZrO2 was obtained by calcining the precursor. The precursor and its calcined products were characterized using TG/DTA, FT-IR, XRD, and SEM. The results showed that the precursor dried at 353 K was a zirconyl carbonate compound. When the precursor was calcined at 673 K for 150 min, highly crystallization ZrO2 with tetragonal structure (space group P42/nmc (137)) was obtained with a crystallite size of 24 nm. However, when the precursor was calcined at 1023 K for 150 min, highly crystallization ZrO2 with monoclinic structure (space group P21/c(14)) was obtained with a crystallite size of 20 nm. The mechanism and kinetics of the thermal process of the precursor were studied using DTA and XRD techniques. Based on the Kissinger and Arrhenius equation, the values of the activation energies associated with the thermal process of the precursor were determined to be 26.80 and 566.73 kJ·mol−1 for the first and third steps, respectively. The mechanism of ZrO2 phase transition from tetragonal to monoclinic structure is the random nucleation and growth of nuclei reaction.


Journal of Thermal Analysis and Calorimetry | 2013

Magnetic properties of nanocrystalline CuFe2O4 and kinetics of thermal decomposition of precursor

Xuehang Wu; Kaiwen Zhou; Wenwei Wu; Xuemin Cui; Yongni Li


Materials Letters | 2015

Synthesis and electrochemical performance of rod-like CuFe2O4 as an anode material for Na-ion battery

Xuehang Wu; Wenwei Wu; Yongni Li; Feng Li; Sen Liao


Journal of Thermal Analysis and Calorimetry | 2011

Nanocrystalline Zn0.5Ni0.5Fe2O4

Wenwei Wu; Yongni Li; Kaiwen Zhou; Xuehang Wu; Sen Liao; Qing Wang


Journal of Thermal Analysis and Calorimetry | 2012

Nanocrystalline Zn0.5Ni0.5Fe2O4: Preparation and kinetics of thermal process of precursor

Wenwei Wu; Yongni Li; Kaiwen Zhou; Xuehang Wu; Sen Liao; Qing Wang


Journal of Thermal Analysis and Calorimetry | 2013

Preparation of magnetic nanocrystalline Mn0.5Mg0.5Fe2O4 and kinetics of thermal decomposition of precursor

Kaiwen Zhou; Wenwei Wu; Yongni Li; Xuehang Wu; Sen Liao


Journal of Thermal Analysis and Calorimetry | 2013

Preparation of nanocrystalline BiFeO3 and kinetics of thermal process of precursor

Jinwen Huang; Peng Su; Wenwei Wu; Yongni Li; Xuehang Wu; Lin Tao


Journal of Superconductivity and Novel Magnetism | 2012

Preparation of Magnetic Cu0.5Mg0.5Fe2O4 Nanoparticles and Kinetics of Thermal Process of Precursor

Jinwen Huang; Peng Su; Wenwei Wu; Yongni Li; Xuehang Wu; Sen Liao


Rare Metals | 2011

Magnetic properties and crystallization kinetics of Zn0.5Ni0.5Fe2O4

Wenwei Wu; Jinchao Cai; Xuehang Wu; Yongni Li; Sen Liao


Journal of Superconductivity and Novel Magnetism | 2013

Magnetic Properties of Cu0.48Ni0.52Fe2O4 and Thermal Process of Precursor

Yongni Li; Xuehang Wu; Wenwei Wu; Kaituo Wang; Sen Liao

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