Résumé
The conditions allowing the preparation of single phase HfSiO4 has been determined through a multiparametric study by varying the concentrations of the reactants, the pH of the reactive media or the temperature and duration of the hydrothermal treatment. HfSiO4 was prepared through relatively soft conditions (pH ≤ 1.6, CSi ≈ CHf ≥ 0.21 mol·L‑1, T ≥ 150°C for t ≥ 24 hours).