2022. THE EFFECT OF MODIFY NaOH CONCENTRATION ON THE STRUCTURE AND MAGNETIC PROPERTIES IN CO-PRECIPITATED NANOCRYSTALLINE BISMUTH SUBSTITUTED COBALT FERRITE. Jurnal Teknologi. 84, 3 (Mar. 2022), 9–15. DOI:https://doi.org/10.11113/jurnalteknologi.v84.17137.