NbTe4相变材料:打破相变温度平衡在2D范德瓦尔斯过渡金属二元基化物
Yi Shuang1, Qian Chen2,3, Mihyeon Kim4
1WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan.
Advanced materials (Deerfield Beach, Fla.)
|June 20, 2023
概括
电化物 (NbTe4) 为非易失性记忆器件提供了一个有前途的解决方案. 它的低点和高结晶温度解决了当前相变内存材料的挑战,使数据存储高效和稳定.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 固态电子 固态电子
背景情况:
- 二维 (2D) 范德瓦尔斯 (vdW) 过渡金属二基化物 (TMD) 显示出由于可调节性质和可扩展性而具有非易失性记忆的潜力.
- 目前的TMD制造方法,特别是通过喷雾制造的大面积,受到高点的阻碍,需要高温才能获得良好的结晶性.
- 现有的相变存储材料面临着诸如高重置能和不良的无形相位热稳定性等挑战.
研究的目的:
- 为了探索低点 (低Tm) 2D vdW过渡金属 (TM) 甲基化物用于非挥发性内存应用.
- 识别和评估 telluride (NbTe) 作为一个潜在的候选材料.
- 通过材料创新解决当前相变内存化合物的局限性.
主要方法:
- 与传统的TMD相比,重点是2D vdW TM四基化物,点较低.
- 对于其点 (Tm) 和结晶温度 (Tc) 进行了研究.
- 分析了在回火时沉积的无形NbTe4的相变行为.
主要成果:
- NbTe4具有约447°C的超低点 (Tm).
- 随着NbTe4的生长,它是无形的,可以在超过272°C的温度下结晶.
- 观察到低Tm和相对较高Tc的组合.
结论:
- NbTe4为高点TMDs提供了一个可行的替代方案,用于非易失性内存制造.
- 它独特的热性能 (低Tm,高Tc) 可以克服当前内存材料中高重置能量和低热稳定性的问题.
- NbTe4显示出对推进相位变换内存技术的重大前景.
相关概念视频
Properties of Transition Metals
26.4K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
26.4K
Phase Transitions
19.2K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
19.2K
Valence Bond Theory
8.8K
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...
8.8K
Phase Transitions: Sublimation and Deposition
17.3K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
17.3K
Crystal Field Theory - Tetrahedral and Square Planar Complexes
43.2K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
43.2K
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR
1.1K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.1K


