Bridgman Method
Mostrando 1-12 de 12 artigos, teses e dissertações.
-
1. Propiedades físicas y cristalinas del Cd1-xZnxTe (0 ≤ x ≤ 1)
ABSTRACT Cd1-xZnxTe (0 ≤ x ≤ 1) and ZnTe are II-VI semiconductors, which are used in single crystalline structure to improve their crystalline and electrical properties. The CZT and ZnTe must possess high crystalline and electrical quality to be used, the first in x or γ-ray detectors, and as substrates for suitable epitaxial films for detecting IR radi
Matéria (Rio J.). Publicado em: 19/07/2018
-
2. Influences of Growth Velocity and Fe Content on Microstructure, Microhardness and Tensile Properties of Directionally Solidified Al-1.9Mn-xFe Ternary Alloys
In this study, influences of growth velocity and composition (Fe content) on the microstructure (rod spacing) and mechanical properties (microhardness, ultimate tensile strength and fracture surface) of Al-Mn-Fe ternary alloys have been investigated. Al-1.9 Mn-xFe (x=0.5, 1.5 and 5 wt. %) were prepared using metals of 99.99% high purity in the vacuum atmosph
Mat. Res.. Publicado em: 11/05/2017
-
3. Effects of Te additions and stirring in the In segregation in Ga1-xInxSb alloys
Abstract The influence of tellurium in the indium segregation of Ga1-xInxSb:Te ingots obtained by the conventional vertical Bridgman method (CVBM), under stirred and non-stirred conditions, was investigated. Three Te-doped ingots and three no-doped ingots were unidirectionally solidified at a constant speed of 2.0 mm/hour, inside quartz ampoules, closed unde
REM, Int. Eng. J.. Publicado em: 2016-12
-
4. Desenvolvimento do cristal semicondutor de iodeto de mercúrio para aplicação como detector de radiação / Development of the mercury iodide semiconductor crystal for application as a radiation detector
In this work, the establishment of a technique for HgI growth and preparation of crystals, for use as room temperature radiation semiconductor detectors is described. Three methods of crystal growth were studied while developing this work: (1) Physical Vapor Transport (PVT); (2) Saturated Solution of HgI2, using two different solvents; (a) dimethyl sulfoxide
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/07/2011
-
5. Laüe back-reflection method for crystallographic orientation of a martensitic Cu-Zn-Al single crystal of the monoclinic system
A martensitic single crystal Cu-23.95Zn-3.62(wt.%)Al alloy was obtained melting pure Cu, Zn and Al using Bridgman's method. The martensitic phase (monoclinic) can present up to 24 variants, and orienting the surface according to a certain plane is a very hard task. The single crystal was submitted to 8 tons of tension (stress) along the longitudinal directio
Química Nova. Publicado em: 2008
-
6. Desenvolvimento de cristais baseados em iodeto de Césio para aplicação como detectores de radiação / Development of crystals based in cesium iodide for application as radiation detectors
Cintiladores inorgânicos com tempo de decaimento de luminescência rápido, densidade alta e boa produção de luz têm sido objeto de estudos para aplicações em física nuclear, física de energias altas, tomografia nuclear e outros campos da ciência e da engenharia. Cristais de cintilação baseados em iodeto de césio (Csl) são materiais que apresent
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/06/2006
-
7. Desenvolvimento do cristal semicondutor de Brometo de Tálio para aplicações como detector de radiação e fotodetector / Development of TIBr semiconductor crystal for applications as radiation detector and photodetector
In this work, TlBr crystals were grown by the Bridgman method from zone melted materials. The influence of the purification efficiency and the crystalline surface quality on the crystal were studied, evaluating its performance as a radiation detector. Due to significant improvement in the purification and crystals growth, good results have been obtained for
Publicado em: 2006
-
8. Simulação numérica bidimensional de crescimento de ligas binárias utilizando processamento paralelo / Bidimensionalnumericalsimulationofgrowthofbinaryalloysusingparallelprocessing
A solidificação direcionada de ligas semicondutoras é uma das técnicas mais utilizadas para a obtenção de substratos cristalinos de alta qualidade, constituindo um protótipo de estudo de fenômenos de transporte macroscópicos envolvendo o acoplamento das equações de conservação de massa, momento e energia. As propriedades cristalinas do material
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2001
-
9. Simulação numérica bidimensional de crescimento de ligas binárias utilizando processamento paralelo / Bidimensionalnumericalsimulationofgrowthofbinaryalloysusingparallelprocessing
The directional solidification of semiconductor alloys is an usual technique for the attainment of a high quality crystalline substratum. This technique is a prototype for the study of macrocospic transport phenomena and involves the coupling of the conservation equations for mass, moment and energy. The crystalline properties of the alloy depend basically o
Publicado em: 2001
-
10. Simulação numérica bidimensional de crescimento de ligas binárias utilizando processamento paralelo / Bidimensionalnumericalsimulationofgrowthofbinaryalloysusingparallelprocessing
A solidificação direcionada de ligas semicondutoras é uma das técnicas mais utilizadas para a obtenção de substratos cristalinos de alta qualidade, constituindo um protótipo de estudo de fenômenos de transporte macroscópicos envolvendo o acoplamento das equações de conservação de massa, momento e energia. As propriedades cristalinas do material
Publicado em: 2001
-
11. Estudo dos sistemas binarios Fe-Pr e Fe-Nd em torno de suas respectivas regiões euteticas
The aim of this thesis is to better resolve the two sequencial thermal events, which appear in the differential thermal analysis of alloys, with compositions around the eutectic regions of the Fe-Pr and Fe-Nd systems. We intend to verify if these events have relation with metastable magnetic phases which are observed in as-cast alloys in both systems, and to
Publicado em: 1997
-
12. Crescimento e caracterização de liga eutetica sn-se
In many eutectic alloys. directional solidification is likely to resu1t in the formation of a fine anisotropic and regular structure of the lamellar or rod type. The development of specific microstructural characteristics depends upon the conditions at and the shape of the solid/liquid interface. To grow composite materiais from eutectic alloys is the main p
Publicado em: 1994