[14a-D62-1~12] 9.2 ナノワイヤ・ナノ粒子

▼ [14a-D62-10] Crystal Structure Analysis of La₂CuO₄ Nanoparticles:
High Pressure Phase Appeared under Air Pressure

〇(D)Faisal Budiman¹、Yoichi Horibe¹、Hirofumi Tanaka¹ (1.Kyushu Inst. of Tech.)

キーワード：nanoparticles

La₂CuO₄ (LCO) is an oxide material which has orthorhombic perovskite structure. Depends on temperature or pressure, its phase transition occurs¹. It has been reported that materials with A₂BO₄ structure exhibits a wide range of magnetic and electrical properties². Here, LCO nanoparticles (NPs) was successfully fabricated via sol-gel method and its superlattice structure of high pressure phase appeared under air pressure. Fig.1 (a) shows the XRD chart of the fabricated LCO NPs (accordance with JCPDS: 38-0709). Pure LCO phase is obtained and LCO superlattice peaks are detected as well at 36 and 36.4^o, under air pressure. As the superlattice structure exist in the LCO, it is expected that a “new formation of unit cell” will exhibit a unique electrical and magnetic properties³. We also could control the particle size of LCO by varying the annealing condition. As shown in Fig.1 (b), the superlattice intensity ratio was in proportion to the LCO particle size in the range. The superlattice peaks were appeared due to the octahedron oxygen in LCO is tilted zigzag along to <110> direction.