Sr₂NaOsO₆, an ordered double perovskite, was obtained by solid‐state synthesis. The compound crystallizes in a monoclinic cell [P2₁/n, a = 5.7043(1) Å, b = 5.7828(1) Å, c = 8.0816(2) Å; β = 90.01(2)°] and develops long‐range antiferromagnetic order at ≈ 17 K with strong canting generating a tiny spontaneous moment of 0.06 µ_B/Os ion. A fit of the high temperature susceptibility data according to a modified Curie–Weiss law revealed a small effective paramagnetic moment of 0.7 µ_B/Os, which underlines the substantial effect of spin‐orbit coupling in 5d oxides. A broad instead of a sharp lambda anomaly in specific heat data suggests frustration and strong magnetic disorder at the osmium lattice.

中文翻译：

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Sr2NaOsO6的结构和磁性

Sr ₂ NaOsO ₆是有序的双钙钛矿，是通过固态合成获得的。该化合物在单斜晶胞中结晶[ P 2 ₁ / n，a = 5.7043（1），b = 5.7828（1），c = 8.0816（2）；β = 90.01（2）°]，并在≈17 K处形成长距离反铁磁有序，并强烈倾斜，产生0.06 µ _B / Os离子的微小自发矩。根据修改后的居里-韦斯定律对高温磁化率数据进行拟合，发现有效顺磁矩很小，为0.7 µ _B / Os，这突显了自旋轨道耦合在5 d内的巨大影响氧化物。比热数据中的拉姆达异常范围较宽而不是尖锐，这表明suggests晶格处存在挫折感和强烈的磁异常。