Isotopic dependence of the frequency of optical vibrations in molybdenum monohydride
作者:Mikhail A. Kuzovnikov、Vladimir E. Antonov、Thomas Hansen、Alexandre S. Ivanov、Alexander I. Kolesnikov、Valery I. Kulakov、Vitaly D. Muzalevsky、Stanislav Savvin、Marek Tkacz
DOI:10.1016/j.jallcom.2021.162299
日期:2022.2
It is currently known that three hydrides – PdHx, MoHx, and TiHx – exhibit an inverse isotopeeffect in superconductivity. Namely, the phase with a heavier hydrogen isotope, deuterium, has a higher critical temperature. Hydrides and deuterides of palladium have intensively been studied both experimentally and theoretically, but the origin of the isotopeeffect has not been established with certainty
这是目前已知的是,3个氢化物- PDH X,卫生部X,和TIH X -表现出超导逆同位素效应。即,具有较重氢同位素氘的相具有较高的临界温度。钯的氢化物和氘化物已在实验和理论上进行了深入研究,但尚未确定同位素效应的起源。普遍接受的解释是,该效应可能是由于光学氢振动的强烈非谐性所致,这被认为是导致基频 ω H /ω D = 1.51 与谐波值2 ≈ 1.41。在本论文中,MoH 1.1(1)和 MoD 1.07(3) 的粉末样品是在几千兆帕的氢/氘压力下合成的,并在环境压力和T = 10 K下通过非弹性中子散射 (INS) 进行研究。 INS研究表明,MoH 1.1 中的 H 原子和 MoD 1.07中的D 原子的光振动是谐波的,基频的比值ω H /ω D = 1.44 接近谐波值2 ≈ 1.41。这表明非谐性不是存在逆同位素效应的必要条件。在环境压力和T = 100 K下通过中子衍射 (ND)
decomposition of aluminum hydride etherate in presence of LiBH4 and excess LiAlD4. β-AlD3 was determined by powder neutron diffraction and synchrotron X-ray diffraction to take the pyrochlore structure and it crystallizes in spacegroup F d 3 ¯ m . The cubic structure has unit-cell dimension a = 9.0037(1) A and consists of corner-sharing AlD6 octahedra where each hydrogen is shared between two octahedra. Each
摘要 以LiAlD4 和AlCl3 为原料,在LiBH4 和过量LiAlD4 存在下,乙合氢化铝热分解合成了β-AlD3。β-AlD3 由粉末中子衍射和同步加速器 X 射线衍射确定为烧绿石结构,在空间群 F d 3 ¯ m 中结晶。立方结构的晶胞尺寸 a = 9.0037(1) A 并且由共享角的 AlD6 八面体组成,其中每个氢在两个八面体之间共享。一个八面体周围的六个八面体中的每一个都与周围的其他两个八面体相互连接。八面体正在形成一个具有大约 3.9 A 通道的 3D 网络。有 1 个 Al 和 1 个 D 晶位,Al-D 距离为 1.712(1) A。
Estimation of bonding nature using diamagnetic susceptibility
作者:Keisuke Tomiyasu、Toyoto Sato、Shin-ichi Orimo
DOI:10.1039/c5cc02351c
日期:——
A relationship between diamagnetic susceptibility and electronegativity was discovered, which provides a laboratory-based estimation method of bonding nature.
发现了二磁感应强度与电负性之间的关系,这为我们提供了一种基于实验室的键合性质估算方法。
Neutron spectroscopy of aluminium trihydride
作者:A I Kolesnikov、M Adams、V E Antonov、N A Chirin、E A Goremychkin、G G Inikhova、Yu E Markushkin、M Prager、I L Sashin
DOI:10.1088/0953-8984/8/15/004
日期:1996.4.8
The lattice dynamics of and were studied by inelastic neutron scattering (INS). The hydrogen optic modes in the INS spectra were shown to form a broad structured band which exhibited an harmonic isotopic behaviour. In contrast, the low-energy part of the phonon spectra, formed mainly by the vibrations of the metal atoms, showed pronounced anharmonicity. The temperature dependence of the heat capacity
通过非弹性中子散射 (INS) 研究 和 的晶格动力学。INS 光谱中的氢光学模式被证明形成了一个宽的结构带,该带表现出谐波同位素行为。相比之下,主要由金属原子振动形成的声子光谱的低能部分表现出明显的非谐性。来自 INS 数据的热容量的温度依赖性与 50-150 K 的可用实验依赖性一致。
Kurth, Fabian A.; Eberlein, Robert A.; Schnoeckel, Hansgeorg, Journal of the Chemical Society. Chemical communications
作者:Kurth, Fabian A.、Eberlein, Robert A.、Schnoeckel, Hansgeorg、Downs, Anthony J.、Pulham, Colin R.