Magnetic Properties of Ba1-xLaxPrO3 and PrLu1-yMgyO3 with x and y <= 0.075

The perovskite-type Ba1-xLaxPrO3 (0 less than or equal to x less than or eq ual to 0.15) and PrLu1-yMgyO3(0 less than or equal to y less than or equal to 0.20) solid solutions containing mixed valent praseodymium ions were pre pared. 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 orthorhombical ly distorted perovskite with space group Alma. From their magnetic suscepti bilities, it was observed that magnetic exchange interactions between Pr io ns in the Ba1-xLaxPrO3 solid solutions were weakened with the La3+ substitu tion 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-si te and at the B-site of the perovskite structure ABO(3) was discussed. (C) 1999 Academic Press.