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

HexaMagDB contains 4388 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 662 literature papers from 1986 to 2026. Single crystals, films, field-oriented or textured samples and composites with other phases are not included. Every record contains at least one magnetic value. The 36 columns of this dataset are explained as follows: 1. Record_ID — identifier of the record within this release (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 — nominally 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 temperature of the loose powder (°C)9. Calcination_Time_h — calcination time (h)10. Sintering_Temperature_C — sintering temperature of the pressed body (°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 or pellet)22. Measurement_Temperature_K — temperature of the magnetic measurement (K), or RT where only room temperature is stated23. 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 — anisotropy constant K1 or Keff per unit volume (erg/cm3)28. K_erg_g — anisotropy constant K1 or Keff per unit mass (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.- RT in Measurement_Temperature_K is not equated with 300 K.- Values that violate physical bounds (Hc ≥ Ha, Ha above 2K/Ms, Ms above the collinear limit, etc.) were removed during validation.