The V-VO phase system

Alexander, David; Carlson, O. N.

doi:10.1007/bf02813255

Cited by 51 publications

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“…Una de las causas a las que apunta el fabricante es la formación de martensita laminar, debido a la alta solubilidad del oxígeno en el vanadio [55]. Según Alexander y Carlson [61], existen fases intermedias de V y O que pueden aparecer de acuerdo al diagrama de equilibrio que proponen. Algunas de estas fases intermedias presentan la microestructura de agujas similar a la de las lagunas de vanadio: estructura monofásica de ' (Ilustración 6-88-a) y estructura de β primaria rodeando la fase  con precipitado de  formada a 46% at de O (Ilustración 6-88-b).…”

Section: Laguna De V Ilustración 6-83 Micrografías Mediante Fesem De ...unclassified

Comportamiento mecánico de nuevas aleaciones de wolframio en función de la temperatura

Cebrian¹

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The main goal of this dissertation is the mechanical characterization as a function of temperature of nine tungsten alloys containing different amounts of titanium, vanadium and yttrium and lanthanum oxide. The alloys under study were the following ones:All of them, besides pure tungsten, were manufactured using a Hot Isostatic Pressing (HIP) process and they were supplied by the Universidad Carlos III de Madrid.

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Section: Laguna De V Ilustración 6-83 Micrografías Mediante Fesem De ...unclassified

Comportamiento mecánico de nuevas aleaciones de wolframio en función de la temperatura

Cebrian¹

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“…It is -8 -6 found that in the temperature range 900-1100 C and pressure range 10 The electron gun contains tungsten, in the form of a circular ring, is placed parallel to a disc shaped pusher grid and is coaxial to a cylindrical extractor grid. Since the filament is off-axial, the extractor Table 4.…”

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Initial oxidation and self-diffusion phenomena on metal surfaces

Srinivasan¹

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INFORMATION TO USERSThis material was produced from a microfilm copy of the original document. While the most advanced technological means to photograph and reproduce this document have been used, the quality is heavily dependent upon the quality of the original submitted.The following explanation of techniques is provided to help you understand markings or patterns which may appear on this reproduction.

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On the Bindings in VO_m Phases

Schubert

1986

Cryst. Res. Technol.

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The phenomenological plural correlations model permits to attribute to the intermediate phases of the mixture VOM bonding types (bindings) which indicate a low energy of the empirically found structures. In the phases various electron subsystems exist which contain lattice‐like spatial correlations, and when the corresponding cells are in energetically low commensurabilities (in harmonies) to the crystal and to one another then the phase becomes stable. A fundamental assumption of a binding analysis is the electron count being here V1,4,8O0,6,2. As a consequence the phases V8O, V16O3, and V7O4 consist of a tetra‐gonally deformed V(B1) partial structure with interstices partly filled by O atoms. The composition of a phase determines the electron concentrations in the subsystems, and these influence the harmony of the correlations in the binding (BFU2 for V16O3, e.g.). In VO, V13O16, V2O3, and V3O5 an essentially complete close packed partial structure of O accepts V into its octahedral interstices. Once more harmonies of electron correlations determine favourable bindings (FF'2 for VO e.g.). The Magnéli phases V4O7 up to V8O15 being shear homeotypes of VO2 · h may be considered as homeodesmic to TiO2 · r, which is stabilized by a CFU2 binding. From the binding it may be concluded how much Hund insertion is present in a phase. Hund insertion is for instance responsible for the transformation VO2 · h → r. The phases V6O13, V4O9 and V3O7 are homeotypic to V2O5. This last phase permits presumably a UHT3 binding. The results of the binding analysis of VOM shed some new light on the interpretation of properties of the VOM phases.

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The V-VO phase system

Cited by 51 publications

References 11 publications

Comportamiento mecánico de nuevas aleaciones de wolframio en función de la temperatura

Comportamiento mecánico de nuevas aleaciones de wolframio en función de la temperatura

Initial oxidation and self-diffusion phenomena on metal surfaces

On the Bindings in VO_m Phases

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The V-VO phase system

Cited by 51 publications

References 11 publications

Comportamiento mecánico de nuevas aleaciones de wolframio en función de la temperatura

Comportamiento mecánico de nuevas aleaciones de wolframio en función de la temperatura

Initial oxidation and self-diffusion phenomena on metal surfaces

On the Bindings in VOm Phases

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On the Bindings in VO_m Phases