Lithium Nickel Phosphate LiNiPO4 and compounds were prepared by addition of some metals precursors like Silver, Carbon and Aluminum to be doped in net powder using “sol-gel “process. The analysis of structural peak intensity with morphology of powders was studied by” XRD, EDX, AFM and SEM”. Heat treatment for materials was performed in temperature in (800) C° in several hours. XRD reveal the olivine structure of LiNiPO4. Morphology were done using SEM photo images, this assisted by AFM test. EDX shows the elements of Ni, O, C, Ag and Al.

The Ni1–xAx Fe2O4 (A=Co, Mg; x=0, 0.5) spinal ferrite were compact in chemical “sol-gel” process. The structure and magnetic properties of the samples were done by XRD and VSM. The heat treatment for the samples was performed at 700°C for 2 hours. The crystalline size of NiFe2O4, Ni0.5Co0.5 Fe2O4 and Ni0.5Mg0.5 Fe2O4 were 34.7 nm, 26.8 nm and 29.8 nm, respectively and magnetic measurements showed that the saturation magnetization of these materials were 48.1 emu/g, 34.4 emu/g and 20.36 emu/g, respectively. The values of coercivity (Hc ) of the NiFe2O4, Ni0.5Mg0.5 Fe2O4 and Ni0.5Mg0.5 Fe2O4 are 182 Oe, 460 Oe and 85Oe.

The goal is to study the effect of the SiO2 micro and nano-particles addition on the strength of epoxy composite based on glass fibers using (2, 4, 6 and 8) wt% of SiO2, the interlaminar fracture toughness (GIC) of 16-plies [M]16 of woven roving glass fiber /epoxy composites prepared by hand lay-up technique were investigated, using DCB test (mode I). The results computed using area method shows that the Interlaminar fracture toughness was increase with the filler content, higher values of GIC were observed for nano SiO2 composites as compared to microcomposites, because nano SiO2 behave as a barrier for crack propagation and the large surface density of these nanoparticles take a position in the polymeric chain restricting the movement for these chains leading to higher values of GIC in comparison with micro SiO2. The lower value of GIC found in 6 and 8 wt% is lower because, of the agglomeration of nano particles. This reflects the behavior of laminated nanocomposites into the same as microcomposites.