Relationship between morphological and physical properties in nanostructured CuMnO2

H. Nguyen, H. Tran
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引用次数: 1

Abstract

In this study, crednerite CuMnO2 nanostructures were prepared using a hydrothermal method at 100 °C with different amounts of NaOH mineralizator. Obtained nanostructured crednerite CuMnO2 with monoclinic structure (space group C2/m) exhibits two kinds of morphologies: nanobelts of the length of 1 - 1.5 µm and thickness of 15 - 25 nm, and nanoplatets being of 50 - 70 nm in diameter. Comparative studies of the preprepared samples reveal an intimate relationship between morphological and physical properties in nanostructured CuMnO2. A low NaOH concentration favours elongated crystal growth along the c-axis, creating nanobelt-shaped morphology. On the other hand, a strong base solution promotes the formation of nanoplates. Unique morphologies of nanostructured CuMnO2 affect distinct spectroscopic and magnetic properties. The nanobelt-shaped sample is characterized by the Raman active A1g mode at 637 cm-1 and a modified Curie-Weiss bahaviour. This phase exhibits two successive magnetic phase transitions: ferromagnetically at 9.2 K and antiferromagnetically at 42 K. Conversely, the nanoplate-shaped sample behaves typically as those reported in the literature, namely, the Raman active A1g mode at 688 cm-1 and low-dimensional magnetism with antiferromagnetic ordering below 62 K. The variation in the magnetic properties is presumably associated to the partial oxidation of Cu1+ and Mn2+ in the nanoplate-shaped sample compared to the divalent state of Cu2+ and trivalent Mn3+ ions in the nanobelt-shaped one.
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纳米结构二氧化锰形态与物理性质的关系
在本研究中,采用水热法在100℃条件下,用不同量的NaOH矿化剂制备了crenerite CuMnO2纳米结构。所获得的单斜结构(空间群C2/m)纳米二氧化锰呈现出两种形态:长度为1 ~ 1.5µm、厚度为15 ~ 25 nm的纳米带和直径为50 ~ 70 nm的纳米片。制备样品的对比研究揭示了纳米结构二氧化锰的形态和物理性质之间的密切关系。低NaOH浓度有利于晶体沿c轴生长,形成纳米带状形态。另一方面,强碱溶液促进纳米板的形成。纳米结构CuMnO2的独特形态影响其独特的光谱和磁性能。该纳米带状样品在637 cm-1处具有拉曼主动A1g模式和改进的居里-魏斯行为。该相表现出两个连续的磁相变:9.2 K的铁磁相变和42 K的反铁磁相变。相反,纳米板状样品的表现与文献报道的典型一样,即在688 cm-1处具有拉曼主动A1g模式,并且在62 K以下具有反铁磁有序的低维磁性。磁性能的变化可能与纳米片状样品中Cu1+和Mn2+的部分氧化有关,而纳米带状样品中Cu2+和Mn3+离子为二价状态。
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