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초록· 키워드
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Synthesis of ZnCo₂O₃ oxide is performed by sol-gel method via nitrate-citrate route. Powder X-ray diffraction (XRD) study shows monoclinic unit cell having lattice parameters: a = 5.721(1) Å, b = 8.073(2) Å, c = 5.670(1) Å, β = 93.221(8)°, space group P<SUB>2/m</SUB> and Z = 4. Average crystallite sizes determined by Scherrer equation are the range ~14-32 ㎚, whereas SEM micrographs show nano-micro meter size particles formed in ZnCo₂O₃. Endothermic peak at ~798 K in the Differential scanning calorimetric (DSC) trace without weight loss could be due to structural transformation and the endothermic peak ~1143 K with weight loss is due to reversible loss of O₂ in air atmosphere. Energy Dispersive X-ray (EDX) analysis profile shows the presence of elements Zn, Co and O which indicates the purity of the sample. Magnetic measurements in the range of +12 kOe to -12 kOe at 10 K, 77 K, 120 K and at 300 K by PPMS-II Physical Property Measurement System (PPMS) shows hysteresis loops having very low values of the coercivity and retentivity which indicates the weakly ferromagnetic nature of the oxide. Observed Xband EPR isotropic lineshapes at 300 K and 77 K show positive g-shift at g<SUB>iso</SUB> ~2.230 and g<SUB>iso</SUB> ~2.217, respectively which is in agreement with the presence of paramagnetic site Co<SUP>2+</SUP>(3d⁷) in the oxide. DC conductivity value of 2.875 x10<SUP>-8</SUP> S/cm indicates very weakly semiconducting nature of ZnCo₂O₃ at 300 K. DRS absorption bands ~357 ㎚, ~572 ㎚, ~619 ㎚ and ~654 ㎚ are due to the d-d transitions ⁴T<SUB>1g</SUB>(⁴F)→2E<SUB>g</SUB>(2G), ⁴T<SUB>1g</SUB>(⁴F)→⁴T<SUB>1g</SUB>(⁴P), ⁴T<SUB>1g</SUB>(⁴F)→⁴A<SUB>2g</SUB>(⁴F), ⁴T<SUB>1g</SUB>(⁴F)→⁴T<SUB>2g</SUB>(⁴F), respectively in octahedral ligand field around Co<SUP>2+</SUP> ions. Direct band gap energy, E<SUB>g</SUB>~ 1.5 eV in the oxide is obtained by extrapolating the linear part of the Tauc plot to the energy axis indicates fairly strong semiconducting nature of ZnCo₂O₃.
목차
ABSTRACT
INTRODUCTION
EXPERIMENTAL
RESULTS AND DISCUSSION
CONCLUSION
REFERENCES
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