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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Molecular and Ionic Solids02:54

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Proton-controlled molecular ionic ferroelectrics.

Yulong Huang1, Jennifer L Gottfried2, Arpita Sarkar3

  • 1Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA. yhuang59@buffalo.edu.

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|August 19, 2023
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Summary
This summary is machine-generated.

This study introduces molecular ionic ferroelectrics with simultaneous ionic conductivity and ferroelectricity. These materials show tunable properties like polarization and conductivity when exposed to stimuli, paving the way for multifunctional devices.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Nanotechnology

Background:

  • Molecular ferroelectrics typically rely on hydrogen bonds, electrostatic, and van der Waals forces.
  • Achieving ionically tailored multifunctionality in molecular ferroelectrics remains a challenge.
  • Existing materials lack the combined ionic conductivity and ferroelectric properties crucial for advanced applications.

Purpose of the Study:

  • To develop novel molecular ionic ferroelectrics.
  • To investigate the coexistence of room-temperature ionic conductivity and ferroelectricity.
  • To explore the stimuli-responsive and tunable properties of these materials.

Main Methods:

  • Synthesis of molecular ionic ferroelectrics.
  • Characterization of ionic conductivity and ferroelectric properties.
  • Investigation of property tuning via absorbed water molecules and external stimuli.

Main Results:

  • Demonstrated coexistence of room-temperature ionic conductivity (6.1 × 10⁻⁵ S/cm) and ferroelectricity.
  • Observed tunable polarization (0.68–1.39 μC/cm²) through absorbed water molecules.
  • Reported controlled changes in thermal conductivity (13%) and electrical resistivity (86%) due to proton transfer.

Conclusions:

  • Successfully engineered molecular ionic ferroelectrics with coupled ionic and ferroelectric behaviors.
  • Established a pathway for developing multifunctional materials through ionic lattice manipulation.
  • Findings open new avenues for advanced stimuli-responsive molecular electronic devices.