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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Tetrahedral Complexes
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New polymorphism for BaTi(IO3)6 with two polymorphs crystallizing in the same space group.

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Summary
This summary is machine-generated.

Two new polymorphic phases of barium titanium iodate, α- and β-BaTi(IO₃)₆, were synthesized. Despite similar structures and space groups, distinct X-ray patterns and morphologies confirm they are different phases, marking a novel polymorphic transition.

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Area of Science:

  • Materials Science
  • Crystallography
  • Solid-State Chemistry

Background:

  • Barium titanium iodate (BaTi(IO₃)₆) is a material with potential applications in various fields.
  • Polymorphism, the ability of a solid material to exist in more than one crystal structure, is crucial for tuning material properties.

Purpose of the Study:

  • To synthesize and characterize new polymorphic forms of BaTi(IO₃)₆.
  • To investigate phase transitions in BaTi(IO₃)₆, particularly focusing on polymorphs with identical space groups.

Main Methods:

  • Solid-state synthesis techniques were employed to obtain the polymorphic phases.
  • Powder X-ray diffraction (PXRD) was used to analyze the crystal structures.
  • Microscopy techniques were utilized to examine crystal morphologies.

Main Results:

  • Two distinct polymorphic phases, denoted as α- and β-BaTi(IO₃)₆, were successfully synthesized.
  • Both polymorphs crystallize in the same space group and exhibit highly similar unit cell parameters.
  • Differences in powder X-ray diffraction patterns and crystal morphologies clearly distinguish the two phases, indicating a genuine phase transition.

Conclusions:

  • The discovery of α- and β-BaTi(IO₃)₆ represents the first reported instance of phase transitions in BaTi(IO₃)₆.
  • This study highlights the possibility of distinct polymorphic phases coexisting within the same space group and having similar cell dimensions, offering new avenues for materials design.