Influence of cooling atmosphere on the structure, magnetization, and dielectric properties of CaBaCo₄O₇

CaBaCo₄O₇ has been widely studied because of its distinctive structure and magnetic properties. This study examined the influence of different cooling atmospheres on the structure, magnetic properties, and dielectric behavior of CaBaCo₄O₇. Samples were cooled under different atmospheric conditions to assess these influences. Our findings indicate that reduced oxygen content leads to increased lattice distortion. Since oxygen atoms play a crucial role in mediating magnetic exchange, oxygen deficiency disrupts long-range magnetic order and promotes short-range antiferromagnetic interactions. Additionally, the cooling atmosphere significantly impacts grain size, thereby affecting the dielectric constant and dielectric loss. In the argon-cooled CaBaCo₄O₇ (Ar) sample, oxygen deficiency reduced dielectric permittivity and increased dielectric loss.