[ 145] K. Kakushima, K. Tachi K, J. Song, S. Sato, H. Nohira, E. Ikenaga, P. Ahmet, K.Tsutsui, N. Sugii, T.Hattori, H. Iwai, “Comprehensive x-ray photoelectron spectroscopy study on compositional gradient lanthanum silicate film”, JOURNAL OF APPLIED PHYSICS, Vol.106, 2009