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Semiconductors01:22

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Stress-Strain Diagram - Ductile Materials01:24

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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
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In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
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Room-temperature ductile inorganic semiconductor.

Xun Shi1, Hongyi Chen2,3, Feng Hao2,4

  • 1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, China. xshi@mail.sic.ac.cn.

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|April 11, 2018
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Summary
This summary is machine-generated.

Researchers discovered a new inorganic semiconductor, silver sulfide (α-Ag₂S), exhibiting remarkable room-temperature ductility. This finding challenges previous assumptions and opens doors for flexible electronic devices.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Inorganic Chemistry

Background:

  • Ductility is a characteristic property of metals and metal alloys.
  • Inorganic semiconductors and ceramic insulators typically exhibit brittle behavior.
  • Room-temperature ductile inorganic semiconductors have not been previously documented.

Purpose of the Study:

  • To report the discovery of a novel inorganic semiconductor with significant room-temperature ductility.
  • To investigate the underlying mechanisms responsible for the observed ductility in the material.
  • To explore the potential applications of ductile inorganic materials in flexible electronics.

Main Methods:

  • Synthesis and characterization of the inorganic semiconductor α-Ag₂S.
  • Mechanical testing to evaluate plastic deformation strains at room temperature.
  • Analysis of chemical bonding and crystal structure to understand ductility.

Main Results:

  • The inorganic semiconductor α-Ag₂S demonstrates extraordinary metal-like ductility at room temperature.
  • High plastic deformation strains were achieved, surpassing typical semiconductor behavior.
  • Analysis revealed planes with weak atomic interactions and irregularly distributed silver bonds contributing to ductility.

Conclusions:

  • The discovery of ductile α-Ag₂S challenges the conventional understanding of semiconductor properties.
  • Weak atomic interactions and bond irregularities are key factors enabling unprecedented ductility.
  • This research paves the way for the development of ductile inorganic semiconductors for flexible electronic applications.