MAGNETIC CHARACTERISTICS OF SOME LANTHANIDE NITRIDES
MAGNETIC CHARACTERISTICS OF SOME LANTHANIDE NITRIDES
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一些镧系氮化物的磁特性
DOI：
10.1021/ic50043a021
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发表时间：
1966
影响因子：
4.6
通讯作者：
W. Wallace
中科院分区：
文献类型：
--
作者：
D. Schumacher;W. Wallace
在2至300 K的温度范围内测定了Y、La、Ce、Nd、Sm、Yb、Lu及其氮化物的磁化率()。Y、La和Lu及其氮化物是泡利顺磁体。 SmN 在 13 K 以下呈反铁磁有序。NdN 在 35 K 以下表现出铁磁有序。其在 2 K 时铁磁态的磁矩为 2.15 µ，而游离 Nd3+ 离子的磁矩为 3.3 µ。这种减少归因于晶体场猝灭。从测量的时刻来看，基态 Nd8+ 离子的整体分裂倍数！估计为 234 K。顺磁 NdN 中 Nd 的有效矩与自由离子的预期值非常一致。 YbN 在 > 100 K 时表现出居里-魏斯行为，其矩与 Yb3+ 离子的预期矩相当一致。然而，YbN 的大小以及居里-魏斯行为的低温偏差尚不清楚。 Yb 结果显示 34% Yb3+ 和 66% Yb2+。 CeN 结果表明是 Ce3+ 和 Ce4+ 的混合物，其中后者在低温下占主导地位。根据理论预期，在温度低至 2 K 时，CeN 和 YbN 没有观察到磁有序。
Magnetic susceptibilities () of Y, La, Ce, Nd, Sm, Yb, Lu, and theirnitrides were determined over a temperature range ex-tending from 2 to 300 K. Y, La, andLu and their nitrides are Pauli paramagnets. SmN orders antiferromagnetically below 13 K. NdN exhibits ferromagnetic ordering below 35 K. Its magnetic moment inthe ferromagnetic state at 2 K is 2.15 µ, as contrasted with 3.3 µ for the free Nd3+ ion. The reduction is ascribed to crystal field quenching. From the measuredmoment an over-all splitting of the ground state Nd8+ ion multiple! is estimated to be 234 K. The effective moment of Nd in paramagnetic NdN is in good agreement with that expected for the free ion. YbN exhibits Curie-Weiss behavior at> 100 K with a moment in fair agreement with that expected for the Yb3+ ion. However, the magnitude of for YbN and the low-temperature deviation from Curie-Weiss behavior are not understood. Results for Yb indicate 34% Yb3+ and 66% Yb2+. The CeN results indicate a mixture of Ce3+ and Ce4+ with the latter strongly predominating at low temperatures. In accordance with theoretical expectations no magnetic ordering is observed for CeN and YbN at tem-peratures down to 2 K.