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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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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...
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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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...
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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

111
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
111
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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...
47.5K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

23.3K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
23.3K
Metallic Solids02:37

Metallic Solids

16.4K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Intrinsic nanostructure in Zr2-xFe4Si16-y(x = 0.81, y = 6.06).

G J Smith1, J W Simonson, T Orvis

  • 1Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 29, 2014
PubMed
Summary
This summary is machine-generated.

Researchers studied a new Zr-Fe-Si compound, revealing ordered vacancies and nanoscale superconducting grains. This layered material exhibits superconductivity near 6 K, suggesting potential for discovering new bulk superconductors.

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Area of Science:

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

Background:

  • Fe-based ternary compounds are of interest for their unique physical properties.
  • Understanding crystal structure and defects is crucial for novel material properties.

Purpose of the Study:

  • To investigate the crystal structure and physical properties of a new Fe-based ternary compound, Zr1.19Fe4Si9.94.
  • To characterize the nature of vacancies and their impact on magnetic and superconducting behavior.

Main Methods:

  • Single crystal growth and characterization.
  • High-resolution transmission electron microscopy (HRTEM) for structural analysis.
  • Magnetic susceptibility, magnetization, neutron diffraction, electrical resistivity, and specific heat measurements.

Main Results:

  • Zr1.19Fe4Si9.94 is a layered compound with ordered Zr and Si vacancies within 3.5 nm domains.
  • No bulk magnetic order was observed down to 1.5 K.
  • The material is metallic with superconductivity onset at Tc ≃ 6 K, indicated by specific heat and partial resistive/magnetic transitions.
  • Evidence suggests nano-sized superconducting grains within a non-superconducting host.

Conclusions:

  • The Zr-Fe-Si ternary system is a promising source for new bulk superconductors.
  • Ordered vacancies significantly influence the material's properties.
  • The observed superconductivity in nano-grains warrants further investigation for bulk superconductivity potential.