Effect of ‘Mo’ doping into BiMnO3 on structural, dielectric, and leakage current properties

Abstract

The simultaneous existence of more than one ferroicorder (ferroelectric, magnetic and ferroelastic) i.e., multiferroism in materials is the center of attention of the current materials researchers. Multiferroism is rare in the materials due to the different chemistry of the ferroic orders and highly useful in various device applications such as in spintronics. In this connection, BiMnO3 is one of the multiferroic materials among the number of available multiferroic materials. It shows ferroelectricity as well as antiferromagnetic nature simultaneously . In the present work, efforts have been made to synthesize the BiMnO3 in pure phase as well as with the doping of ‘Mo’ in the ratio of 2 %, 4 %, and 8 % via solid-state reaction route and denoted by BMM0, BMM2, BMM4, and BMM8, respectively. The structural analysis confirms the monoclinic structure along with some impurities and also confirms the polycrystalline nature of all the samples. Impurities reduce with the ‘Mo’ doping into BiMnO3. The dielectric and leakage current density measurements confirm the high dielectric constant, low dielectric loss, and low leakage current density values in the samples as increment in the ‘Mo’ content into the pure BiMnO3 phase. The BMM8 has the dielectric constant (∼2265 at 1 kHz and ∼ 385 at 10 kHz), dielectric loss (∼2.32 at 1 kHz and ∼ 2.66 at 10 kHz), and leakage current density (∼3.73 × 10-4 A/cm2 at 2 V and ∼ 1.00 × 10-3 A/cm2 at 3 V).