HexaMagDB: a dataset of magnetic properties, structure and synthesis of doped barium and strontium M-type hexaferrites

HexaMagDB contains 4402 records of magnetic properties, structure and synthesis of polycrystalline Ba, Sr and mixed Ba–Sr M-type hexaferrites (AFe12O19), undoped and doped with 48 elements (Al, Bi, Ca, Cd, Ce, Co, Cr, Cu, Dy, Er, Eu, Ga, Gd, Hf, Ho, In, Ir, K, La, Li, Lu, Mg, Mn, Mo, Na, Nb, Nd, Ni, Pb, Pr, Re, Ru, Sb, Sc, Si, Sm, Sn, Ta, Tb, Ti, Tl, Tm, V, W, Y, Yb, Zn and Zr), covering 2095 unique compositions reported in 664 literature papers from 1986 to 2026. Single crystals, films and field-oriented or textured samples are not included. Every record contains at least one magnetic value. The 36 columns of this dataset are explained as follows: 1. Record_ID — stable identifier of the record (HM-0001, HM-0002, etc.)2. Formula — nominal chemical formula of the sample3. Dopant — dopant element(s), separated by ";" (empty for undoped samples)4. Dopant_Amount — amount of each dopant per formula unit, in the same order as Dopant5. Substitution — substituted site for each dopant (e.g., Al→Fe, La→Sr)6. Synthesis_Method — class of the synthesis route (solid-state, sol-gel auto-combustion, sol-gel, co-precipitation, hydrothermal, etc.)7. Synthesis_Procedure — description of the synthesis quoted from the article8. Calcination_Temperature_C — calcination (annealing) temperature (°C)9. Calcination_Time_h — calcination time (h)10. Sintering_Temperature_C — sintering temperature of pressed samples (°C)11. Sintering_Time_h — sintering time (h)12. a_A — lattice parameter a (Å)13. c_A — lattice parameter c (Å)14. V_A3 — unit cell volume (Å3)15. Crystallite_Size_nm — crystallite size from X-ray diffraction (nm)16. Particle_Size_nm — particle or grain size from microscopy (nm)17. Particle_Size_Method — method and object of the size measurement (SEM grain, SEM particle, TEM particle, etc.)18. Phase_Purity — phase composition (single phase, impurity present, multiphase)19. Secondary_Phases — secondary phases reported in the article20. Secondary_Phase_wt — fraction of secondary phases (wt%)21. Sample_Form — form of the sample in the magnetic measurement (powder, pellet, other)22. Measurement_Temperature_K — temperature of the magnetic measurement (K)23. Ms_emu_g — saturation magnetization (emu/g)24. Ms_Determination_Method — how Ms was obtained (maximum-field or extrapolation), curator classification25. Maximum_Field_kOe — maximum applied field in the magnetic measurement (kOe)26. Ha_kOe — anisotropy field (kOe)27. K_erg_cm3 — magnetocrystalline anisotropy constant (erg/cm3)28. K_erg_g — magnetocrystalline anisotropy constant (erg/g)29. Mr_emu_g — remanent magnetization (emu/g)30. Hc_kOe — coercivity (kOe)31. Mr_Ms — squareness ratio Mr/Ms32. Tc_K — Curie temperature (K)33. DOI — DOI of a data source for given values34. Journal — journal of a data source35. Year — year of a data source36. Synthesis_Notes — additional synthesis details not covered by other columns (precursor ratios, post-treatment) Notes:- Empty cells denote values not reported in the article.- Values that violate physical bounds (Hc ≥ Ha, Ha above 2K/Ms, Ms above the collinear limit, etc.) were removed during validation.