Acoustic shock wave-induced superheating-assisted dynamic recrystallization - a case study of D-tartaric acid.

Superheating-assisted melting and crystallization are prominent subjects in condensed matter physics. However, understanding the superheating concepts under acoustic shocked conditions remains a mystery. Herein, we demonstrate superheating on the basis of dynamic recrystallization in a D-tartaric acid powder sample, which nearly attains an ideal crystal structure and morphology under the 100-shocked conditions compared to the control sample and the obtained results are evaluated by conventional diffraction, spectroscopic and microscopic techniques.

Acoustic Shock Wave-Induced Rutile to Anatase Phase Transition of TiO Nanoparticles and Exploration of Their Unconventional Thermodynamic Structural Transition Path of Crystallization Behaviors.

Titanium dioxide (TiO) is one of the most well-known and long-standing polymorphic materials in the transition metal oxide group of materials. The transition from rutile to anatase is one of the long-standing fundamental questions among materials science researchers because seeking the nucleation site at the beginning of the phase transition is highly challenging. Until now, there have been no studies on the unconventional structural phase transition of TiO nanoparticles by acoustic shock waves.

Co-precipitation synthesis of highly pure and Mg-doped CdO nanoparticles: from rod to sphere shapes.

This study reports a facile approach for examining surface morphology transitions in semiconductor nanoparticles (NPs), with a focus on pristine and magnesium-doped cadmium oxide NPs. Mg-doped CdO NPs are synthesized co-precipitation, and their composition, structure, and elemental distribution are analyzed through X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Raman spectra, and X-ray photoelectron spectroscopy (XPS), along with optical characterization and impedance analysis. Doping with Mg changes the morphology from rod-like to quasi-spherical, reduces the crystallite size, and impacts their structural and functional properties.

Acoustic Shock Wave-Induced Amorphous to Crystalline Phase Transitions of LiSO─Raman Spectroscopic and Thermal Calorimetric Approach.

In this context, we have reexamined the acoustical shock wave-induced amorphous-glassy-crystalline-amorphous phase transitions in the LiSO sample under 0, 1, 2, and 3 shocked conditions by implementing the detailed Raman spectroscopic approach. The recorded Raman spectroscopic data clearly reveal that the transition from the amorphous-glassy-crystalline state occurs because of a significant reduction of the translational disorder of lithium cations, particularly [Li (2)] ions wherein a slight reduction of the librational disorder of SO anions takes place, whereas the crystalline to amorphous transition occurs only at the third shocked condition because of the librational disorder of SO anions. The double degenerate υ and υ Raman modes provide a clear indication of the occurrence of the librational disorder of SO anions at the third shocked condition.