Structural and Magnetic Investigations of the Novel Pyrophosphate Na7Ni3Fe(P2O7)4

IF 2.6 4区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Magnetochemistry Pub Date : 2023-06-24 DOI:10.3390/magnetochemistry9070162

Sirine El Arni, Mohammed Hadouchi, A. Assani, M. Saadi, M. El Marssi, A. Lahmar, Lahcen El Ammari

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引用次数: 0

Abstract

A novel pyrophosphate Na7Ni3Fe(P2O7)4 was synthesized in two distinct forms, single-crystal and powder. Single-crystal X-ray diffraction was used to determine the crystal structure, and powder X-ray diffraction and scanning electron microscopy were used to examine the purity and morphology of the elaborated powder. This phosphate crystallizes in the P1¯ space group of the triclinic system with a = 6.3677 (2) Å, b = 9.3316 (4) Å, c = 10.8478 (4) Å, α = 65.191 (1)°, β = 80.533 (1)° and γ = 73.042 (1)°. The crystal framework is assembled from the linkage of centro-symmetrical clusters Ni2(Ni/Fe)2P4O28. Each cluster consists of two (Fe1/Ni1)O6 octahedra, two Ni2O6 octahedra and two P2O7 units. The linkage of these clusters is provided by two other P2O7 units to generate a three-dimensional structure with distinct tunnels in the [100], [010] and [001] directions, housing the Na+ cations. The infrared and Raman analyses show the characteristic bands of the pyrophosphate anion P2O74−. Remarkably, the magnetic investigations revealed the coexistence of two magnetic transitions at ~29 K and ~4.5 K with dominating antiferromagnetic interactions.

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新型焦磷酸盐Na7Ni3Fe（P2O7）4的结构和磁性研究

合成了一种新的焦磷酸盐Na7Ni3Fe（P2O7）4，它有单晶和粉末两种不同的形式。用单晶X射线衍射法测定了粉末的晶体结构，用粉末X射线衍射和扫描电子显微镜检查了精制粉末的纯度和形态。该磷酸盐在三斜晶系的P1空间群中结晶，a=6.3677（2）Å，b=9.3316（4。晶体骨架是由中心对称的团簇Ni2（Ni/Fe）2P4O28连接而成。每个团簇由两个（Fe1/Ni1）O6八面体、两个Ni2O6八面和两个P2O7单元组成。这些团簇的连接由另外两个P2O7单元提供，以产生在[100]、[010]和[001]方向上具有不同隧道的三维结构，其中容纳Na+阳离子。红外光谱和拉曼光谱分析显示了焦磷酸阴离子P2O74−的特征谱带。值得注意的是，磁性研究揭示了在~29K和~4.5K处存在两种磁性跃迁，并具有主要的反铁磁相互作用。

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来源期刊

Magnetochemistry Chemistry-Chemistry (miscellaneous)

CiteScore

3.90

自引率

11.10%

发文量

145

审稿时长

11 weeks

期刊介绍： Magnetochemistry (ISSN 2312-7481) is a unique international, scientific open access journal on molecular magnetism, the relationship between chemical structure and magnetism and magnetic materials. Magnetochemistry publishes research articles, short communications and reviews. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.