Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Work01:14

Work

Work is a fundamental concept of mechanical engineering and has many applications. Understanding how work is calculated and the different types of work can help us better understand physical processes and provide insights into complex problems.
Work is defined as the result of a force acting on an object, causing it to move along the line of action of force. It is also defined as the process of transferring energy through the application of force on an object, resulting in its displacement.
Softwoods and Hardwoods01:28

Softwoods and Hardwoods

Softwoods and hardwoods, derived from different types of trees, are distinguished by their leaf structures and cellular compositions, each serving unique purposes in construction and manufacturing. Softwoods come from cone-bearing trees with needle-like leaves and are predominantly composed of longitudinal cells called tracheids and a smaller proportion of radial cells known as rays. Due to their cellular structure, softwoods are commonly used in construction for structural frames, sheathing,...
Toughness and Hardness of Aggregate01:22

Toughness and Hardness of Aggregate

Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in the...
Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used to...

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Strength of spider silk.

Science (New York, N.Y.)·1996
Same author

Metallic glasses.

Science (New York, N.Y.)·1980
Same journal

Erratum for the Research Article "Detecting supramolecular organic nanoparticles during heat wave".

Science (New York, N.Y.)·2026
Same journal

Local signals, systemic decline.

Science (New York, N.Y.)·2026
Same journal

The mechanics of liver regeneration.

Science (New York, N.Y.)·2026
Same journal

Computing in a memory with physics.

Science (New York, N.Y.)·2026
Same journal

Retraction.

Science (New York, N.Y.)·2026
Same journal

Making time.

Science (New York, N.Y.)·2026
Ver todos los artículos relacionados

Video Experimental Relacionado

Updated: Jul 7, 2026

Quantitative Hardness Measurement by Instrumented AFM-indentation
08:21

Quantitative Hardness Measurement by Instrumented AFM-indentation

Published on: November 22, 2016

Por qué el silicio es duro.

J J Gilman

    Science (New York, N.Y.)
    |September 10, 1993
    PubMed
    Resumen
    Este resumen es generado por máquina.

    Los sólidos covalentes como el silicio son frágiles debido al limitado movimiento de dislocación. Esta fragilidad se explica por un proceso atómico análogo a la sustitución química, revelando por qué estos materiales resisten la deformación.

    Más Videos Relacionados

    Determining the Mechanical Strength of Ultra-Fine-Grained Metals
    05:04

    Determining the Mechanical Strength of Ultra-Fine-Grained Metals

    Published on: November 22, 2021

    Microhardness Measurements on Tooth and Alveolar Bone in Rodent Oral Disease Models
    06:16

    Microhardness Measurements on Tooth and Alveolar Bone in Rodent Oral Disease Models

    Published on: April 26, 2024

    Videos de Experimentos Relacionados

    Last Updated: Jul 7, 2026

    Quantitative Hardness Measurement by Instrumented AFM-indentation
    08:21

    Quantitative Hardness Measurement by Instrumented AFM-indentation

    Published on: November 22, 2016

    Determining the Mechanical Strength of Ultra-Fine-Grained Metals
    05:04

    Determining the Mechanical Strength of Ultra-Fine-Grained Metals

    Published on: November 22, 2021

    Microhardness Measurements on Tooth and Alveolar Bone in Rodent Oral Disease Models
    06:16

    Microhardness Measurements on Tooth and Alveolar Bone in Rodent Oral Disease Models

    Published on: April 26, 2024

    Área de la Ciencia:

    • Ciencia de los materiales Ciencia de los materiales.
    • Física del estado sólido Física del estado sólido
    • Física Química Física Química es la física de la química.

    Sus antecedentes:

    • Los sólidos covalentes, como el silicio, exhiben dureza y fragilidad, a diferencia de los metales y las sales iónicas.
    • El movimiento de dislocación en sólidos covalentes está restringido, ocurriendo solo a temperaturas elevadas.
    • Una explicación clara de este fenómeno ha sido difícil de alcanzar, a pesar de su importancia en la mecánica de los materiales.

    Objetivo del estudio:

    • Proporcionar una explicación satisfactoria de la fragilidad de los sólidos covalentes.
    • Para dilucidar los mecanismos a nivel atómico que rigen el movimiento de dislocación en estos materiales.
    • Para vincular las propiedades mecánicas de los sólidos covalentes a sus características de unión.

    Principales métodos:

    • Analogía entre el movimiento de dislocación y las reacciones de sustitución química.
    • Utilizando diagramas de correlación para el análisis de procesos atómicos.
    • Investigando el papel de la simetría de enlace atómico en la deformación del material.

    Principales resultados:

    • El proceso atómico crítico para la fragilidad es análogo a una reacción de sustitución química.
    • El análisis revela una alta tensión resistiva y una alta energía de activación para el movimiento de dislocación.
    • El movimiento de la dislocación interrumpe la simetría de los enlaces atómicos, un proceso que es energéticamente desfavorable.

    Conclusiones:

    • La fragilidad observada de los sólidos covalentes está fundamentalmente vinculada a un proceso similar a la sustitución atómica.
    • El alto estrés resistivo y la energía de activación son consecuencias directas de este proceso.
    • La ruptura de la simetría de enlace atómico durante el movimiento de dislocación explica la resistencia del material a la deformación.