CePd2Sn3, CePd2Sn4, and Ce3Pd6Sn10 – Ternary stannides of new structure typesстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 16 апреля 2014 г.
Аннотация:The crystal structures of the new ternary rare-earth stannides CePd2Sn3, CePd2Sn4, and Ce3Pd6Sn10 have been determined from single-crystal X-ray data: Pbcm, Z = 4, a = 13.799(6) Å, b = 6.246(3) Å, c = 6.134(6) Å (CePd2Sn3); Cmcm, Z = 4, a = 16.315(4) Å, b = 6.291(2) Å, c = 6.081(4) Å (CePd2Sn4); Cmcm, Z = 4, a = 44.027(2) Å, b = 6.2710(3) Å, c = 6.1266(4) Å (Ce3Pd6Sn10). The structures of CePd2Sn3 (an interstitial variant of the CeCrSb3 type) and CePd2Sn4 are closely related being comprised of the same type of layers whereas the Ce3Pd6Sn10 structure can be constructed of the CePd2Sn3 and CePd2Sn4 types as the constituent fragments based on the order given by the sequence in a-direction: [1/4CePd2Sn4–CePd2Sn3–1/2 CePd2Sn4–CePd2Sn3–1/4CePd2Sn4]. The magnetic properties of the three novel compounds were studied down to 1.72 K. They have been found to be Curie Weiss paramagnets with stable Ce3+ magnetic moments. While CePd2Sn3 remains paramagnetic down to the lowest temperatures studied, CePd2Sn4 and Ce3Pd6Sn10 order antiferromagnetically below 2.1 K and 4.4 K, respectively. For the latter stannide a subsequent order–order transition likely occurs below 1.72 K.