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Related Concept Videos

The Seven Crystal Systems: Overview01:24

The Seven Crystal Systems: Overview

Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific requirements are not imposed on the...
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...
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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...
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Imperfections in Crystal Structure: Non-Stoichiometric Defects

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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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 the dxy,...
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Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Harmonic Nanoparticles for Regenerative Research
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New nonlinear optical crystal: NaBa4Al2B8O18Cl3.

Jianxiu Zhang1, Shufeng Zhang, Yicheng Wu

  • 1Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

Inorganic Chemistry
|June 6, 2012
PubMed
Summary

Large single crystals of NaBa4Al2B8O18Cl3 were grown using top-seeded solution growth. This new borate chloride material exhibits promising optical, thermal, and mechanical properties for materials science applications.

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Materials Science

Background:

  • The synthesis and characterization of novel inorganic compounds with unique structural and functional properties are crucial for advancing materials science.
  • Borate and chloride-containing compounds are of interest due to their diverse applications in optics, electronics, and catalysis.

Purpose of the Study:

  • To grow large single crystals of NaBa4Al2B8O18Cl3 using the top-seeded solution growth method.
  • To investigate the crystallographic, optical, thermal, and mechanical properties of the synthesized NaBa4Al2B8O18Cl3 crystals.
  • To explore the potential applications of this new material based on its characterized properties.

Main Methods:

  • Top-seeded solution growth method utilizing a NaF-LiCl flux.
  • X-ray diffraction for crystallographic analysis (tetragonal system, space group P4(2)nm).
  • Optical measurements (UV transmission, IR spectrum, second-harmonic generation, refractive indices via minimum deviation technique and Sellmeier equations).
  • Thermal analysis (Differential Scanning Calorimetry, thermal expansion).
  • Mechanical property testing (hardness, density, chemical stability).

Main Results:

  • Successfully grew large single crystals of NaBa4Al2B8O18Cl3 (up to 34 × 34 × 16 mm³).
  • Determined the crystal structure: tetragonal system, space group P4(2)nm, with specific lattice parameters (a = 12.0480 Å, c = 6.8165 Å).
  • Reported comprehensive optical, thermal, and mechanical properties, including UV-Vis-NIR transmission, IR spectra, SHG, refractive indices, DSC, thermal expansion, hardness, density, and chemical stability.
  • Identified the crystal structure built from infinite anionic groups of [AlB4O12](9-).

Conclusions:

  • NaBa4Al2B8O18Cl3 is a novel inorganic compound with a well-defined crystal structure.
  • The material exhibits a range of desirable optical, thermal, and mechanical properties.
  • The successful growth of large single crystals and the characterization of its properties suggest potential applications in various technological fields.