Texture and Magnetic Properties of Mn–Cu Co‐Doped BaFe ₁₂ O ₁₉ Ceramics Prepared From Hydrothermally Synthesized Nanoparticles

This study investigates ceramic samples of Mn–Cu‐doped barium hexaferrite synthesized from hydrothermally derived powders. The addition of copper enhances sintering through the formation of low‐melting phases, while manganese promotes hexaferrite crystallization during hydrothermal synthesis, yielding thin hexaferrite nanoplates. The plate‐like morphology induces preferential orientation during pressing, resulting in texture development and magnetic anisotropy. The structural and magnetic properties of pressed pellets were analyzed as a function of sintering time and temperature using X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy, magnetic force microscopy, and vibrating sample magnetometer (VSM). XRD patterns confirmed that all samples consisted of single‐phase hexaferrites. VSM studies reveal that sintering at 950°C for 3 h maximizes hysteresis squareness (0.715) and preserves high coercivity (4.2–4.4 kOe). This optimal performance is attributed to the partial (00l) texture. Increasing the sintering temperature to 1000°C causes secondary recrystallization and exaggerated grain growth, as observed by SEM. This microstructure evolution disrupts the texture and leads to a reduction in coercivity to 2.2–3.4 kOe and a decrease in squareness.