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Videos de Conceptos Relacionados

Formal Charges02:42

Formal Charges

In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
Acid Strength and Molecular Structure03:05

Acid Strength and Molecular Structure

Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...

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Video Experimental Relacionado

Updated: Jul 9, 2026

Synthesis and Microdiffraction at Extreme Pressures and Temperatures
07:26

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

Cambios estructurales y de enlace en el yoduro de cesio a altas presiones.

E Knittle, R Jeanloz

    Science (New York, N.Y.)
    |January 6, 1984
    PubMed
    Resumen

    El yoduro de cesio se transforma estructuralmente y electrónicamente bajo alta presión. Se convierte en un semiconductor alrededor de 60 gigapascales y puede convertirse en metálico cerca de 100 gigapascales.

    Área de la Ciencia:

    • Física del estado sólido física del estado sólido.
    • Ciencia de los materiales ciencia de los materiales.
    • Física de las altas presiones.

    Sus antecedentes:

    • El yoduro de cesio (CsI) es una sal iónica en condiciones ambientales.
    • Comprender el comportamiento de los materiales bajo presión extrema es crucial para las aplicaciones científicas y tecnológicas fundamentales.

    Objetivo del estudio:

    • Para investigar las propiedades estructurales y electrónicas del yoduro de cesio bajo alta presión.
    • Para determinar las transiciones de fase inducidas por la presión y los cambios en la estructura de la banda electrónica.

    Principales métodos:

    • Experimentos de alta presión utilizando células de yunque de diamante.
    • Análisis de los cambios estructurales y evolución de la brecha de banda electrónica.

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    Principales resultados:

    • El yoduro de cesio sufre una transformación estructural de segundo orden de B2 a tetragonal centrada en el cuerpo a 40 gigapascales.
    • La brecha de banda electrónica de CsI disminuye significativamente con el aumento de la presión, pasando de un aislante a un semiconductor.
    • La extrapolación sugiere que el CsI puede volverse metálico a presiones alrededor de 100 gigapascals.

    Conclusiones:

    • La alta presión altera drásticamente las propiedades del yoduro de cesio, induciendo una transición de fase y el comportamiento del semiconductor.
    • Estos hallazgos proporcionan información sobre la evolución electrónica y estructural dependiente de la presión de los materiales iónicos.
    • Fenómenos similares pueden ocurrir en otros haluros alcalinos en regímenes de alta presión comparables.