Ferromagnetic Cr4PtGa17: 呼吸するピロクロール格子を持つ半ヒュスラー型化合物
Xin Gui1, Erxi Feng2, Huibo Cao2
1Department of Chemistry, Princeton University, Princeton, New Jersey 08540, United States.
Journal of the American Chemical Society
|August 27, 2021
まとめ
我々はCr4PtGa17を発見しました 独特の構造を持つ 新しい金属間化合物です この材料は61K未満のフェロマグネティック・オーダーリングと大きな磁気抵抗を示し,半ヒュースラー化合物の研究に新しい道を開きます.
科学分野:
- 固体化学
- 材料科学
- 凝縮物質物理学
背景:
- 三重金属間化合物は様々な性質を持っています.
- ハーフ・ヒュースラー化合物は通常,単一の元素から構成される.
- 先進的な素材の機能性のために新しい構造モチーフが求められます.
研究 の 目的:
- 結晶構造と磁気特性を報告する 新しい三重金属間の化合物,Cr4PtGa17.
- この新しい材料の磁気構造と電子構造を調査する.
- 新しいタイプのハーフ・ヒュースラー化合物としての可能性を 探求するためです
主な方法:
- 単一結晶のX線微分法で構造を決定する.
- 磁気特性の分析のためのニュートロン difraktionと磁気計.
- 電子構造調査のための密度関数理論 (DFT) の計算.
主要な成果:
- Cr4PtGa17は,ロンボヘッドの非中心対称空間群R3mで結晶する.
- TC ~ 61 K 以下のフェロマグネティック・オーダーリングは, ~ 0.25 μB/Cr の小さな飽和モメントで観測される.
- 2Kで ~140%の有意な磁気抵抗が測定されました.
- DFTの計算では ほぼ半金属の電子構造を示している.
結論:
- Cr4PtGa17は,呼吸するピロクロール格子を持つ最初の鉄磁気的にオーダーされた材料です.
- クラスタ占有率のある半ヒュースラー型構造の最初の実現を表しています.
- この発見は 独特の磁気と電子特性を持つ 新しい半ヒュスラー化合物の開発に インスピレーションを与えるかもしれません
さらに関連する動画
08:43Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
Published on: October 27, 2018
18.4K
08:42High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
Published on: October 10, 2014
11.8K
関連する概念動画
01:31Ferromagnetism
2.5K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.5K
03:02Colors and Magnetism
12.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.6K
02:58Crystal Field Theory - Octahedral Complexes
28.5K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.5K
01:13Five-Membered Heterocyclic Aromatic Compounds: Overview
4.5K
Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
4.5K
02:42Valence Bond Theory
9.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
9.9K
02:37Metallic Solids
19.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
19.6K