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Zn2MnSbO6 and Zn2FeSbO6: Two New Polar High-Pressure Ordered Corundum-Type Compounds
Chemistry of Materials ( IF 7.2 ) Pub Date : 2024-12-03 , DOI: 10.1021/acs.chemmater.4c02146
Alessia Provino, Thomas J. Emge, David Walker, Corey E. Frank, Suguru Yoshida, Venkatraman Gopalan, Mark Croft, Zheng Deng, Changqing Jin, Pietro Manfrinetti, Martha Greenblatt

Two new compounds, Zn2FeSbO6 and Zn2MnSbO6, have been synthesized under high-pressure and high-temperature conditions. The synthesis, single-crystal and powder X-ray diffraction, X-ray absorption near-edge spectroscopy (XANES), optical second harmonic generation (SHG), and magnetic and heat capacity measurements were carried out for both compounds and are described. The lattice parameters are a = 5.17754(6) Å and c = 13.80045(16) Å for Zn2FeSbO6 and a = 5.1889(10) Å and c = 14.0418(3) Å for Zn2MnSbO6. Single-crystal X-ray diffraction analyses indicate that Zn2FeSbO6 consists of a cocrystal of superimposed Ni3TeO6 (NTO) and ordered ilmenite (OIL) components with a ratio of approximately 2:1 and Zn2MnSbO6 contains two nearly identical, but noncrystallographically related, OIL components in a ratio of approximately 6:1. XANES analysis shows Fe3+ and Mn3+ as formal oxidation states for Fe and Mn cations, respectively, for these A2BB′O6 compounds. SHG measurements for Zn2MnSbO6 indicate that it is noncentrosymmetric and confirm the polar R3 (no. 146) space group strongly implied by single-crystal reflection data. The magnetic measurements reveal spin-glass behavior with antiferromagnetic (AFM) interactions in both compounds and a frustration factor (f) being significantly larger for Zn2MnSbO6 (f ≈ 20) compared to Zn2FeSbO6 (f ≈ 7). While Zn2FeSbO6 exhibits AFM ordering at a Néel temperature (TN) of 9 K, Zn2MnSbO6 shows magnetic ordering around 4 K. Additionally, the negative Curie–Weiss temperatures for both compounds corroborate the presence of AFM exchange interactions.

中文翻译:


Zn2MnSbO6 和 Zn2FeSbO6:两种新的极性高压有序刚玉型化合物



在高压和高温条件下合成了两种新化合物,Zn2FeSbO6 和 Zn2MnSbO6。对两种化合物进行了合成、单晶和粉末 X 射线衍射、X 射线吸收近边缘光谱 (XANES)、光学二次谐波产生 (SHG) 以及磁容和热容测量,并进行了描述。Zn2FeSbO6 的晶格参数为 a = 5.17754(6) Å 和 c = 13.80045(16) Å,Zn2MnSbO6 的晶格参数为 a = 5.1889(10) Å 和 c = 14.0418(3) Å。单晶 X 射线衍射分析表明,Zn2FeSbO6 由叠加的 Ni3TeO6 (NTO) 和有序钛铁矿 (OIL) 成分的共晶组成,比例约为 2:1,Zn2MnSbO6 包含两个几乎相同但非晶体学相关的 OIL 成分,比例约为 6:1。XANES 分析显示,对于这些 A2BB′O6 化合物,Fe3+ 和 Mn3+ 分别是 Fe 和 Mn 阳离子的正式氧化态。Zn2MnSbO6 的 SHG 测量表明它是非中心对称的,并证实了单晶反射数据强烈暗示的极地 R3(编号 146)空间群。磁性测量揭示了两种化合物中具有反铁磁 (AFM) 相互作用的自旋玻璃行为,并且与 Zn2FeSbO6f ≈ 7) 相比,Zn2MnSbO6f ≈ 20) 的挫折因子 (f) 明显更大。 虽然 Zn2FeSbO6 在 9 K 的 Néel 温度 (TN) 下表现出 AFM 有序性,但 Zn2MnSbO6 在 4 K 附近表现出磁性有序性。此外,两种化合物的负居里-魏斯温度证实了 AFM 交换相互作用的存在。
更新日期:2024-12-03
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