中文摘要：

除在 ferroelectromagnets 知道的二阶段转变以外，另外的转变在 Pb (Fe_(1/2 )Nb_(1/2 )) 试验性地被观察 O_3 和可能的机制被探索。磁性的时刻显示出那异常增加当温度下沉离开 20-30 K 的 Neel 温度时。磁滞现象的存在验证弱铁磁性的性质。这另外的阶段转变被认为从在在这的铁磁性的订单加重的铁电体和反之间的磁电的联合发源。从 Mossbauer 参数分析，这被证实 O 2p 的杂交， Fe 3d andNb 4d 电子状态使磁电的联合的实现可能。

英文摘要：

Besides the two phase transitions known in ferroelectromagnets, an additional transition was observed experimentally in Pb（Fe1/2Nb1/2）O3 and the possible mechanism was explored. The magnetic moment shows that anomalous increases when the temperature goes down away from the Neel temperature of 20-30 K. The existence of the hysteresis verifies the weak ferromagnetic property. This additional phase transition is considered to originate from the magnetoelectric coupling between the ferroelectric and antiferromagnetic orders in this compound. From the Moessbauer parameter analysis, it is confirmed that the hybridization of the O 2p, Fe 3d and Nb 4d electron states makes the realization of magnetoelectric coupling possible.