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The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Crystal structure of the solid solution Ba8.35Pb0.65(B3O6)6.

Wenwu Zhao1

  • 1Department of Environmental and Chemical Engineering, Tangshan College, 38 North HuaYan Road, Tangshan 063000, Hebei, People's Republic of China.

Acta Crystallographica. Section E, Crystallographic Communications
|March 21, 2017
PubMed
Summary

Researchers synthesized single crystals of lead barium borate, Ba8.35Pb0.65(B3O6)6, using a high-temperature melt. The crystal structure features a unique arrangement of barium and lead atoms with borate anions.

Keywords:
boratecrystal structuresolid solutionspontaneous nucleation

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Crystallography

Background:

  • Lead barium borate (Ba8.35Pb0.65(B3O6)6) is a complex inorganic compound.
  • Understanding its crystal structure is crucial for exploring its properties and potential applications.

Purpose of the Study:

  • To synthesize single crystals of lead barium borate.
  • To determine the three-dimensional crystal structure of Ba8.35Pb0.65(B3O6)6.
  • To compare its structure with related solid solutions in the Ba/Pb/B/O system.

Main Methods:

  • Spontaneous nucleation from a high-temperature melt.
  • Single crystal X-ray diffraction analysis (implied).

Main Results:

  • Successfully obtained single crystals of Ba8.35Pb0.65(B3O6)6.
  • The three-dimensional structure is built upon BaO9 polyhedra, (Pb/Ba)O6 octahedra (with a Pb:Ba occupancy ratio of 0.216:0.784), and B3O6 ring anions.
  • Planar B3O6 anions are arranged alternately with Ba and (Pb/Ba) atoms along the [001] direction.

Conclusions:

  • The crystal structure of lead barium borate has been elucidated.
  • The arrangement of constituent polyhedra and anions provides insights into the material's structural characteristics.
  • Further structural comparisons with related solid solutions can be made.