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Related Concept Videos

Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Design Example: Resistive Touchscreen01:14

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
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Resistance01:19

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When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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Resistive switching effect in titanium oxides.

Zhensen Tang, Yaqing Chi, Liang Fang

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    |April 23, 2014
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    Resistive switching in titanium oxides shows promise for nonvolatile memory. This review details mechanisms like thermochemical metallization and valence change, focusing on defect roles for improved performance.

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    Area of Science:

    • Materials Science
    • Solid-State Physics
    • Nanotechnology

    Background:

    • Resistive switching (RS) is crucial for nonvolatile memory and logic circuits.
    • Binary metal oxides offer advantages in fabrication and CMOS compatibility for micro/nano-electronics.
    • RS mechanisms in these materials are diverse and often debated.

    Purpose of the Study:

    • To review the microscopic understanding of resistive switching in titanium oxides.
    • To categorize the working mechanisms of RS in titanium oxides.
    • To analyze the role of defects and suggest performance improvement strategies.

    Main Methods:

    • Literature review of resistive switching phenomena in titanium oxides.
    • Categorization of RS mechanisms: thermochemical metallization, valence change, and electrostatic/electronic.
    • Analysis of defect roles, particularly oxygen vacancies, in titanium oxides.

    Main Results:

    • Titanium oxides exhibit RS through distinct mechanisms: thermochemical metallization, valence change, and electrostatic/electronic.
    • Defects, specifically oxygen vacancies, play a critical role in the RS behavior of titanium oxides.
    • Various investigation approaches and switching processes linked to different mechanisms are discussed.

    Conclusions:

    • Understanding the microscopic nature of RS in titanium oxides is essential for device optimization.
    • Defect engineering in titanium oxides presents a viable strategy for enhancing RS performance.
    • Further research into RS mechanisms can pave the way for advanced memory and logic applications.