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Undoped, 5%, and 10% lanthanum doped lithium tantalate thin films were annealed at 550 • C temperature for 12.5 hours and their properties were characterized. The results showed that the dopant addition affects the crystal formation of LiTaO 3 , especially the 10% La 2 O 5 dopant, where the lattice of a = 5.11 Å, c = 13.30 Å, and its crystal was hexagonal. The observed functional groups were O-H, N-H, C = C, Li-O, Ta-O. The higher La 2 O 5 dopant concentration leads to the higher absorption of Ta-O and Li-O, the lower the energy gap, the higher the refractive index, and the smaller the particle size of thin films.

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A research on development of learning media based on web blogs on the concepts of momentum and impulse has been done. This research aims to determine the feasibility of physics learning media based on web blogs. Method of this research is Research & Development (R&D) with ADDIE model. This learning media is validated by media experts and material experts. Based on the results of the research, development of learning media based on web blogs on the concepts of momentum and impulse is feasible for students to physics learning.