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This article reports the structural, optical, dielectric, and magnetic properties of yttrium orthoferrite (YFeO3) nanomaterials with different crystallite sizes derived from the sol–gel technique using tartaric acid as a complex agent. Different crystallite sizes (ranging from 0.4 to 2.11 μm) of YFeO3 (YFO) are fabricated by altering the sintering temperatures (in the range of 1173–1623 K) for the same duration (5 h). Rietveld refinements suggest that the different crystallite sizes of YFO exhibit a pure orthorhombic perovskite structure with the Pmna space group. It is observed that the grain size of the material increased with increasing sintering temperature. The highest magnetization value (5.078 emu g−1) is observed for the 0.89 μm size of YFO. A decrease in the optical bandgap of YFO material is observed with an increase in crystallite size. In conclusion, the optimized crystallite size is 0.89 μm for achieving the highest magnetization value of the YFO material synthesized by the sol–gel technique using tartaric acid as a chelating agent.

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