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Electrical Power01:07

Electrical Power

Electric power is the product of current and voltage, represented in units of joules per second, or watts. For example, cars often have one or more auxiliary power outlets with which you can charge a cell phone or other electronic devices. These outlets may be rated at 20 amps and 12 volts, so that the circuit can deliver a maximum power of 240 watts. Consider a 25 Watt bulb and a 60 Watt bulb. The conversion of electrical energy produces heat and light, while the kinetic energy lost by the...
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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
Energy Losses in Transformers01:21

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In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
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Equivalent Circuits for Practical Transformers01:28

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Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties
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Dislocation-Enhanced Pyroelectricity in Barium Titanate.

Hanyu Gong1, Yan Zhang1, Edoardo Zatterin2

  • 1State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China.

Advanced Materials (Deerfield Beach, Fla.)
|December 30, 2025
PubMed
Summary
This summary is machine-generated.

Mechanical doping using dislocations significantly enhances pyroelectric materials for thermal sensing and energy harvesting. This novel approach amplifies domain wall motion, boosting the pyroelectric coefficient by 38-fold.

Keywords:
dislocationferroelectric single crystalplastic deformationpyroelectricity

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Area of Science:

  • Materials Science
  • Solid State Physics

Background:

  • Pyroelectric materials are crucial for thermal sensing and energy harvesting, with the pyroelectric coefficient as a key metric.
  • While lattice defects enhance pyroelectric properties, the role of mobile ferroelectric domain walls is underexplored.

Purpose of the Study:

  • To investigate dislocation-based mechanical doping for enhancing pyroelectric response in barium titanate (BaTiO3) single crystals.
  • To explore the extrinsic contributions of domain wall motion to pyroelectricity.

Main Methods:

  • High-temperature plastic deformation to create anisotropic dislocation networks.
  • Synchrotron scanning X-ray diffraction microscopy and transmission electron microscopy for structural analysis.
  • Multiscale phase-field simulations to understand the underlying mechanisms.

Main Results:

  • Anisotropic dislocation networks induce localized stress and thermal effects, amplifying domain wall motion.
  • Dislocation-domain wall coupling enhances polarization's temperature sensitivity and accelerates domain switching.
  • Achieved a maximum pyroelectric coefficient exceeding 600 nC cm⁻² K⁻¹, a 38-fold increase.

Conclusions:

  • Dislocation engineering offers a new pathway for domain-wall-mediated enhancement of pyroelectric functionality.
  • This strategy significantly boosts pyroelectric performance, opening avenues for advanced thermal devices.