Tunable Negative and Low Thermal Expansion in Magnetic Calcite-Type Fe1-xCrxBO3 (x = 0.0, 0.14, 1.0) Borates: A Comprehensive In Situ Study

Key Points

• The study aims to investigate the thermal expansion properties of Fe1-xCrxBO3 borates across different compositions.
• Synthesis of polycrystalline and single-crystal samples using multi-step solid-state reaction and flux methods.
• In situ refinement of crystal structures to assess thermal expansion characteristics.
• Negative and low thermal expansion was observed in all compositions of Fe1-xCrxBO3 borates.
• Compositions varied distinctly in their thermal properties, suggesting a tunable nature.