Lanthanum doped Z n 0.5 C o L a x F e 2 − O 4 spinel ferrites were synthesized through the co-precipitation technique. To characterize structural, vibrational, electro-optical, dielectric, and thermoelectric properties, following characterization techniques X-ray diffraction (XRD), Fourier transformation infrared (FTIR) Raman spectroscopy, I–V measurement analysis, UV–vis LCR meter, Seebeck Ene...