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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Lattice Energies of Ionic Crystals01:27

Lattice Energies of Ionic Crystals

Lattice energy represents the energy released when gaseous cations and anions combine to form an ionic solid, reflecting the strength of electrostatic interactions within the crystal. This process is fundamentally governed by Coulombic attraction between oppositely charged ions, where the potential energy varies inversely with the interionic distance and directly with the product of ionic charges. As ions approach one another, the electrostatic energy becomes increasingly negative, indicating a...
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Magnetic ionic plastic crystal: choline[FeCl4].

I de Pedro1, A García-Saiz, J González

  • 1CITIMAC & MAGMA, Unidad Asociada-CSIC Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain. depedrovm@unican.es

Physical Chemistry Chemical Physics : PCCP
|June 25, 2013
PubMed
Summary
This summary is machine-generated.

A new organic ionic plastic crystal combines plastic crystal properties with magnetism. This material exhibits stable ionic conduction and antiferromagnetic ordering, suitable for electrochemical applications.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Magnetism

Background:

  • Organic ionic plastic crystals (OIPCs) are materials with unique solid-state properties.
  • Incorporating magnetic anions into OIPCs can lead to multifunctional materials.
  • Quaternary ammonium cations and iron-based anions are common components in materials research.

Purpose of the Study:

  • To synthesize a novel OIPC using a quaternary ammonium cation and a tetrachloroferrate anion.
  • To investigate the combined properties of plastic crystallinity and magnetism in the synthesized OIPC.
  • To evaluate the thermal stability and electrochemical performance of the new material.

Main Methods:

  • Synthesis of the organic ionic plastic crystal.
  • Thermal analysis (Differential Scanning Calorimetry, Thermogravimetric Analysis) to determine phase transitions and melting point.
  • Magnetization measurements (SQUID magnetometry) to study magnetic ordering.
  • Electrochemical characterization (impedance spectroscopy) to assess ionic conductivity.

Main Results:

  • The synthesized OIPC exhibits plastic crystalline behavior with a solid-solid phase transition below room temperature and a high melting point (>220 °C).
  • The material demonstrates good thermal stability up to approximately 200 °C.
  • Magnetization measurements reveal three-dimensional antiferromagnetic ordering below 4 K.
  • Electrochemical characterization shows stable solid-state ionic conduction (10^-2.7 to 10^-3.6 S cm^-1) over a wide temperature range (20-180 °C).

Conclusions:

  • The novel OIPC successfully combines plastic crystalline properties with magnetic ordering.
  • The material possesses excellent thermal stability and significant ionic conductivity.
  • This OIPC is a promising candidate for electrochemical applications requiring both ionic transport and magnetic properties.