Magnetic Properties of Ba1-xLaxPrO3 and PrLu1-yMgyO3 with x and y0.075

The perovskite-type Ba1-xLaxPrO3 (0x0.15) and PrLu1-yMgyO3(0y0.20) solid solutions containing mixed valent praseodymium ions were prepared. Their powder X-ray diffraction measurements were carried out and the magnetic susceptibilities were measured in the temperature range between 4.2 and 300 K. The compound PrLuO3 was prepared for the first time in this study and its crystal structure has been determined to be an orthorhombically distorted perovskite with space group Pnma. From their magnetic susceptibilities, it was observed that magnetic exchange interactions between Pr ions in the Ba1-xLaxPrO3 solid solutions were weakened with the La3+ substitution for the Ba2+. PrLu1-yMgyO3 has no magnetic ordering down to 4.2 K. The difference in magnetic properties of praseodymium ions between at the A-site and at the B-site of the perovskite structure ABO3 was discussed.