1. Sumitomo Chemical Co., Ltd., Advanced Materials Research Laboratory, 6 Kitahara, Tsukuba, Ibaraki 300-3294, Japan
2. Sumitomo Chemical Co., Ltd., Tsukuba Material Development Laboratory, 6 Kitahara, Tsukuba, Ibaraki 300-3294, Japan
3. National Institute for Materials Science, Synchrotron X-ray Station at SPring-8, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan