Silicon allotropes by large-volume high-pressure techniques: crystal growth mechanisms, phase diagrams and hexagonal nanostructured Si-6H by in situ X-ray diffraction and computational methods [0.03%]
高压法合成硅同素异形体：晶体生长机制，相图和原位X射线衍射及计算方法研究六角nano结构Si-6H
Alexandre Courac,Yann Le Godec
Alexandre Courac
Metastable allotropes of silicon recovered from high-pressure conditions exhibit a wide range of crystal structures, physical properties and transformation pathways that remain only partially understood despite decades of study. This articl...
AB2X4 spinel structures: similarity and differences between the centrosymmetric, Fd3m, and non-centrosymmetric, F4132, space groups [0.03%]
AB₂X₄尖晶石结构：中心对称Fd₃m和非中心对称F４₁₃₂空间群的相似性和差异性
Alla Arakcheeva,Arnaud Magrez,Gervais Chapuis
Alla Arakcheeva
Many compounds adopting the spinel AB2X4 structure are technologically important owing to their tunable physical and chemical properties enabling diverse applications in energy storage, catalysis, magnetism, and functional ceramics. Most of...
L-threo-D-galacto-Octitol: a curious non-classical order-disorder polytype with an 88 Å axis [0.03%]
L-苏-ᴅ-半乳糖辛醇：一种奇特的非经典有序无序多型体，具有88 Å轴
Nina Biedermann,Christoph Standfest,Christian Stanetty et al.
Nina Biedermann et al.
GalC8 [L-threo-D-galacto-octitol, systematic name (2S,3R,4R,5R,6R,7S)-octane-1,2,3,4,5,6,7,8-octol] crystallizes with a pseudo-tetragonal lattice featuring a long (∼88 Å) c axis. The bulk of the structure possesses P43212 (Z' = 1) pseudo-...
Kazuki Komatsu,Takuji Ikeda,Tetsuya Kodaira
Kazuki Komatsu
The incommensurate structure of AlPO4-5 and its stability have been investigated in detail. Under ambient conditions, single-crystal X-ray diffraction measurements reveal weak satellite reflections, which become significantly enhanced upon ...
Structural modification of functionalized carbazoles: from Z' = 1 to Z' = 6 [0.03%]
功能化咔唑的结构修饰：从Z'= 1到Z'= 6
Matokah Abualnaja,Michael Richard Probert,Michael John Hall et al.
Matokah Abualnaja et al.
Crystal structures with asymmetric units comprising large numbers of molecules (Z' > 4) remain rare. Their study provides a unique opportunity to further the understanding of the physical basis for crystal formation, supporting the advancem...
α-L-Tyrosine under high pressure: validation of phase transitions and a curious similarity with L-alanine [0.03%]
高压下L-酪氨酸的相变及与L-丙氨酸的有趣相似性
Svetlana S Sharaya,Nikita E Bogdanov,Boris A Zakharov et al.
Svetlana S Sharaya et al.
The baric behavior of α-L-tyrosine, an aromatic amino acid, was investigated using single-crystal X-ray diffraction. Around 2 GPa, the nonlinear behavior in the compression of unit-cell parameters a and c was observed, as N-H...O hydrogen ...
Re-refinement of the structure of the planar hexagonal phase of ZnO nanocrystals [0.03%]
ZnO纳米晶体平面六方相结构的重新精修
Musen Li,Lingyao Zhang,Wei Ren et al.
Musen Li et al.
The planar hexagonal phase of ZnO, known as h-ZnO, g-ZnO, α-ZnO, the Bk structure, the 5-5 phase, the α-BN phase, etc., has P63/mmc symmetry and is implicated in ferroelectric switching mechanisms for wurtzite-ZnO. It is well known in thi...
Form (III) of artemisinin: discovery and crystallographic characterization of a new high-pressure polymorph [0.03%]
青蒿素(III)型：新高压多晶型物的发现及晶体学表征
Banaz Fetah,Lauren E Connor,Mark R Warren et al.
Banaz Fetah et al.
Artemisinin (ART) is mainly used for the treatment of malaria and exhibits polymorphism with two known crystalline forms. In this study, the high-pressure behaviour of these two polymorphs was investigated to evaluate their compressibility ...
Maus's salts: an old family of iron sulfates with possible magnetic frustration [0.03%]
毛斯盐：铁硫酸家族的成员及其可能具有的磁性沮丧现象
Analeece Long,Matthew Powell,Ashley Dickey et al.
Analeece Long et al.
The family of Maus's salts has been known for several centuries, but many aspects of their structures remain elusive, particularly because most examples are highly solvated and readily lose water. To examine the role of alkali cations and w...
Investigating the impact of molybdenum content on the room-temperature optical properties of Li2WO4 crystals grown by low-thermal-gradient Czochralski technique [0.03%]
低热梯度直拉法生长的钼掺杂量对Li2WO4晶体室温光学性能的影响研究
Veronika D Grigorieva,Ekaterina D Bazanova,Marina A Artemyeva et al.
Veronika D Grigorieva et al.
Li2WO4 single crystals and Mo-doped Li2W1-xMoxO4 (x = 0.0125, 0.05) were grown by the low-thermal-gradient Czochralski technique. Optimal crystallization conditions were determined for obtaining single crystals with a length of 50 mm and a ...