Paper Title
Investigation of Physical Properties of Eu3+ Doped Columbite CdNb2O6 Powders

Abstract
Eu3+-doped CdNb2O6 nano powders for varying doping rates (0.5, 3, and 6 mol%) were synthesized at 900 °C using a molten salt method. Orthorhombic phase was observed from X-ray diffraction (XRD) of all patterns were exhibited orthorhombic phase. Ignorable secondary or insufficient crystallization phases were revealed by the increment of Eu3+ in the structure. From scanning electron microscope images, wire type structure was monitored (SEM). To establish magnetic properties of samples, an extensive study was carried out using Quantum Design Physical Properties Measurement System (PPMS). The temperature dependent magnetization behaviour was not agreed with the Curie-Weiss Law, suggesting the coexistence of ferromagnetic and paramagnetic contributions in the samples. By the effect of increasing temperature, the magnetization of the Eu3+-doped CdNb2O6 powders continuously decreases and also the effective magnetic anisotropy decreases with temperature increment. This behavior was resulted in the decreasing of the magnetization of the Eu3+-doped CdNb2O6 nano powders. In the temperature range of 10 - 300 K, the temperature dependence of the susceptibility was not in agreement with Curie-Weiss Law and this suggesting that there should be both the paramagnetic and ferromagnetic contributions in the nano samples. Broad ferromagnetic resonance (FMR) spectra observed from FMR measurements, indicating the ferromagnetic behaviour of the samples. It was found that while the resonance field of the FMR spectra increases, the line width increases as a function of Eu3+ doping concentration. Keywords - Molten Solt Technique, Eu3+-doped CdNb2O6 nano powders, Magnetic properties.