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Yulia S Gokhfeld1, Natalia V Kazak1, Anastasia S Tarasova1

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Summary
This summary is machine-generated.

This study introduces NiCr(BO3)O, a novel disordered oxyborate exhibiting magnetic ordering. It shows a magnetic phase transition at 45 K and a spin-orientation transition, highlighting its unique magnetic properties.

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Magnetism

Background:

  • Oxyborates are a class of inorganic compounds with diverse structural and physical properties.
  • Understanding magnetic ordering in disordered materials is crucial for developing advanced magnetic applications.
  • The warwickite structure is known to host various magnetic ions.

Purpose of the Study:

  • To synthesize and characterize a novel nickel-chromium oxyborate, NiCr(BO3)O.
  • To investigate the magnetic properties and phase transitions of this disordered oxyborate.
  • To establish NiCr(BO3)O as the first example of magnetic ordering in disordered oxyborates.

Main Methods:

  • Flux method synthesis for NiCr(BO3)O.
  • X-ray diffraction for crystal structure determination (orthorhombic warwickite, space group Pbnm).
  • Magnetic susceptibility (dc and ac), heat capacity measurements, and magnetization studies to probe magnetic behavior.

Main Results:

  • NiCr(BO3)O crystallizes in the orthorhombic warwickite structure with significant Ni/Cr disorder.
  • A primary magnetic phase transition occurs at T_N = 45 K, evidenced by magnetic susceptibility and heat capacity anomalies.
  • An additional magnetic anomaly is observed around 10 K, and antiferromagnetic coupling dominates (Weiss temperature ~ -130 K).
  • A field-induced spin-orientation transition is observed below T_N when the field is perpendicular to the c-axis.
  • The effective magnetic moment is approximately 4.9 μB per formula unit.
  • The Debye temperature is determined to be 365 K.

Conclusions:

  • NiCr(BO3)O represents the first oxyborate exhibiting magnetic ordering within a highly disordered metal site environment.
  • The material displays complex magnetic behavior, including a primary antiferromagnetic ordering and a field-induced spin reorientation.
  • This discovery opens new avenues for exploring magnetic phenomena in disordered oxyborate systems.