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Related Concept Videos

Properties of Transition Metals02:58

Properties of Transition Metals

26.8K
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.
26.8K
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

429
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
429
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
308
Phase Transitions02:31

Phase Transitions

19.5K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
19.5K
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

433
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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Fermi Level Dynamics01:12

Fermi Level Dynamics

312
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
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Related Experiment Video

Updated: Aug 16, 2025

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
06:44

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

Published on: June 9, 2023

3.2K

Phase Transition Dynamics in a Complex Oxide Heterostructure.

Qingteng Zhang1, Guoxiang Hu2,3, Vitalii Starchenko4

  • 1X-Ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA.

Physical Review Letters
|December 23, 2022
PubMed
Summary
This summary is machine-generated.

We used X-ray photon correlation spectroscopy to study oxygen vacancy ordering and phase transitions in complex oxides. Our findings reveal the interplay between defect dynamics and phase transformation kinetics.

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Last Updated: Aug 16, 2025

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Writing and Low-Temperature Characterization of Oxide Nanostructures
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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Condensed Matter Physics

Background:

  • Defect behavior in complex oxides dictates their ionic and electronic properties.
  • Studying defect dynamics requires probes sensitive to configuration and time evolution.

Purpose of the Study:

  • To investigate oxygen vacancy ordering and phase transitions in SrCoO_{x} thin films.
  • To understand the interaction between kinetics and dynamics during phase transformation.

Main Methods:

  • X-ray photon correlation spectroscopy (XPCS) for defect dynamics.
  • Synchrotron measurements and theoretical calculations.
  • In situ measurements of dynamic phase behavior.

Main Results:

  • Observed oxygen vacancy ordering and brownmillerite-perovskite phase transition.
  • Revealed close interaction between phase transition kinetics and dynamics.
  • Demonstrated correlation between transition energetics and oxygen vacancy behavior.

Conclusions:

  • The dimensionality of transformation depends on oxidation or reduction.
  • XPCS and synchrotron methods are broadly applicable for in situ studies.
  • Coherent X-ray sources enable novel studies of complex oxides.