Magnetic hyperthermia treatment using calcium phosphate nanoparticles is an evolutionary choice because of its excellent biocompatibility. In the present work, Fe3+ is incorporated into HAp nanoparticles by thermal treatment at various temperatures. Induction heating was examined within the threshold Hf value of 4.58 × 106 kA m–1 s–1 (H is the strength of alternating magnetic field and f is the operating frequency) and sample concentration of 10 mg/mL. The temperature-dependent structural modifications are well correlated with the morphological, surface charge, and magnetic properties. Surface charge changes from +10 mV to −11 mV upon sintering because of the diffusion of iron in the HAp lattice. The saturation magnetization has been achieved by sintering the nanoparticles at 400 and 600 °C, which has led to the specific absorption rate of 12.2 and 37.2 W/g, respectively. Achievement of the hyperthermia temperature (42 °C) within 4 min is significant when compared with the existing magnetic calcium phosphate nanoparticles. The systematic investigation reveals that the HAp nanoparticles partially stabilized with FeOOH and biocompatible α-Fe2O3 exhibit excellent induction heating. In vitro tests confirmed the samples are highly hemocompatible. The importance of the present work lies in HAp nanoparticles exhibiting induction heating without compromising the factors such as Hf value, low sample concentration, and reduced duration of applied field.

The size of the particles of CaWO4:Dy3+ increases with the addition of NH4Cl/KCl electrolyte and enhances its luminescence.

A 5 at.% Dy3+ ions doped CaWO4 nanoparticles (CaWO4:5Dy) were synthesized by hydrothermal method using polyethylene glycol (PEG) as solvent medium and capping agent. The phase purity and crystalline properties of the prepared nanoparticles were obtained from the XRD analysis. TEM images revealed that the CaWO4:Dy3+ have particles of size approximately in the range 30-50 nm. The prepared magnetic luminescence nanocomposite exhibits a high saturation magnetization. The prepared nanocomposite can achieve hyperthermia temperature (42 ºC) in a short period by applying the alternating magnetic field, externally. The nanocomposite also shows photoluminescence properties. Nanomaterials described in this work can be used for optical imaging as well as hyperthermia applications.