scholarly journals Superconducting Bi1.5Pb0.5Sr2Ca2Cu3Oxceramics by rapid melt quenching and glass crystallization

1990 ◽  
Vol 68 (3) ◽  
pp. 1143-1150 ◽  
Author(s):  
Narottam P. Bansal
Keyword(s):  
Glass Crystallization ◽  
Melt Quenching ◽  
Rapid Melt Quenching

scholarly journals Effect of Concurrent ZnO Addition and AlF3Reduction on the Elastic Properties of Tellurite Based Glass System

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Haji Abdul Aziz Sidek ◽  
Raouf El-Mallawany ◽  
Krishnaswamy Hariharan ◽  
Shaharuddin Rosmawati
Keyword(s):  
Glass Sample ◽  
Room Temperature ◽  
Ultrasonic Waves ◽  
Glass System ◽  
Velocity Data ◽  
Compositional Dependence ◽  
Ultrasonic Velocities ◽  
Melt Quenching ◽  
Rapid Melt Quenching ◽  
Longitudinal Modulus

New ternary zinc oxyfluorotellurite (ZOFT) with the composition(ZnO)x-(AlF3)y-(TeO2)z, where5≤x<35;5≤y≤25;60≤z≤70, has been successfully prepared by the conventional rapid melt quenching technique. Density, molar volume, and glass transition temperature have been assessed for each ZOFT glass sample. The longitudinal and transverse ultrasonic waves propagated in each glass sample were measured using a MBS8020 ultrasonic data acquisition system at 5 MHz frequency and room temperature. The longitudinal modulus (L), shear modulus (G), Young’s modulus (E), bulk modulus (K), and Poisson’s ratio (σ) are assessed from both velocity data and their respective density. The compositional dependence of the ultrasonic velocities and related parameters are discussed to understand the rigidity and compactness of the glass system studied.

Crystallochemistry of Amorphous State in Ni(Co, Fe)-Nb(V, Ta, Mo+Zr) Alloy Systems

2019 ◽  
Vol 31 ◽  
pp. 1-5
Author(s):  
Valeriy V. Savin ◽  
Ludmila A. Savina ◽  
Vera Semina ◽  
Vasiliy Semin ◽  
Natalia Pavlovna Dyakonova
Keyword(s):  
Amorphous State ◽  
Glass Forming Ability ◽  
Size Factor ◽  
Melt Quenching ◽  
Atomic Size ◽  
Glass Forming ◽  
Preparation Conditions ◽  
Rapid Melt Quenching ◽  
Quenching Method ◽  
Zr Alloy

Effects of the crystallochemical factors on amorphous state formation in the Ni−Nb-based systems are studied. Alloys with compositions (Ni, Co, Fe)−(Nb, Ta, V, Mo+Zr) are prepared by rapid melt quenching method with various cooling rates. It was found that at given preparation conditions and at certain atomic size factor, glass forming ability depends on factor of electron concentration was defined as number of s+d electrons per atom. Atomic size factor is necessary take into account, too. High glass forming ability of Ni−Nb alloys are attributed to formation possibility of two distinct E93 type phases.

Effect of Site Disorder on Martensitic Transformation in Ferromagnetic Ni55Fe20Al25 Alloy as Inferred from Magnetic and Magneto-Transport Measurements

2008 ◽  
Vol 52 ◽  
pp. 77-84 ◽  
Author(s):  
A.C. Abhyankar ◽  
B. Annie D'Santhoshini ◽  
S.N. Kaul ◽  
A.K. Nigam
Keyword(s):  
Magnetic Field ◽  
Phase Transformation ◽  
Martensitic Transformation ◽  
Neutron Diffraction ◽  
Annealed Sample ◽  
Melt Quenching ◽  
Rapid Melt Quenching ◽  
Site Disorder ◽  
Tentative Explanation ◽  
Neutron Diffraction Technique

Neutron diffraction technique is used to identify the crystal structures and study the phase transformation in a ternary Ni55Fe20Al25 alloy, prepared in the ordered and site-disordered states by annealing and rapid-melt-quenching techniques. We report the observation of ‘step-like’ wavy structures in the thermomagnetic curves taken on ordered samples. No such features are observed in the site-disordered counterparts. Negative magnetoresistance at 10 K and in a magnetic field of 80 kOe in the disordered sample is nearly two times larger than that in the annealed sample. A tentative explanation for these phenomena is given.

scholarly journals LiYF4-nanocrystal-embedded glass ceramics for upconversion: glass crystallization, optical thermometry and spectral conversion

RSC Advances ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 2066-2073
Author(s):  
Xinyue Li ◽  
Liting Qiu ◽  
Youli Chen ◽  
Yiwen Zhu ◽  
Hua Yu ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Glass Crystallization ◽  
Melt Quenching ◽  
Optical Thermometry ◽  
Quenching Method ◽  
Spectral Conversion

LiYF4 NCs embedded GCs were fabricated via melt-quenching method and subsequent glass crystallization. It is evidenced that it is favorable of UC, which is promising in optical thermometry and spectral conversion.

Electrical Conductivity and Structural Studies on the Binary System BiI3-Ag2SO4

2012 ◽  
Vol 584 ◽  
pp. 521-525
Author(s):  
S. Austin Suthanthiraraj ◽  
Ayesha Saleem
Keyword(s):  
Electrical Conductivity ◽  
Binary System ◽  
Ionic Conduction ◽  
Structural Characteristics ◽  
Complex Impedance ◽  
Present System ◽  
Rapid Melt Quenching ◽  
Ionic Nature ◽  
Electrochemical Devices ◽  
Silver Sulphate

A new solid-state pseudo binary system BiI3_-Ag2SO4 involving bismuth triiodide (BiI3) and a silver oxysalt namely silver sulphate (Ag2SO4) has been prepared using rapid melt-quenching technique. AC conductivity studies have been carried out on the nine different samples of the (BiI3)x –- (Ag2SO4)(1-x) system with compositions corresponding to x=0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8 and 0.9 mole fraction at temperatures ranging from room temperature (298 K) to 433K. The bulk resistance values estimated using complex impedance plots indicated that electrical conductivity of the synthesized solid specimens would vary from 2.9 x10-2 to 3.4 x10-6Scm-1 thus suggesting the present system to be ionic in nature. The extent of ionic conduction due to Ag + cation has also been analyzed using Wagner’s dc polarization technique whereas detailed structural characteristics of the various compositions derived from Fourier transform infrared (FTIR) spectroscopy and features of surface morphology of these samples obtained using scanning electron microscopy (SEM) have further supported the ionic nature of the chosen system and suggested possible application as a solid electrolyte in electrochemical devices.

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