TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The powder comprises more than 90% in number of the base particles. The base particles have a sphericity index of greater than 0.02, preferably greater than 0.1 and less than 0.3. In the powder, at least 80% in number of the base particles have needle and/or plaquette forms. In the powder, at least 80% in number of the base particles are assembled in the form of ordered and/or disordered aggregated particles. The aggregated particles are: in the form of stars comprising 3-15 branches; in the form of strips constituted of 2-50 plaquettes; and in the form of hollow spheres having a sphericity index of greater than 0.7 and comprising a central cavity such that if D is the largest outer diameter of the particle and D' denotes the largest inner diameter of the cavity, and D/D' is greater than 2. The powder has a porosity index of greater than 2, where the porosity index is equal to the ratio (Asr)/(Asg), where the Asg is theoretical specific surface area of the powder particles and the Asr is measure of the actual specific surface area by Brauner-Emmett-Teller (BET). The dimensions of the base particles are greater than 50 nu m, preferably greater than 200 nm; and a maximum particle size of less than 150 mu m. The derivative is (non)doped basic zirconium sulfate and/or hafnium sulfate, (non)doped basic zirconium phosphate and/or hafnium phosphate, and/or (non)doped basic zirconium carbonate and/or hafnium carbonate. The derivative is doped by using a dopant comprising the compounds 17 of elements, and compound 1 of the element and a compound based on yttrium, scandium, lanthanide, alkaline earth metals, titanium, silicon, sulfur, phosphorus, aluminum, tungsten, chromium, molybdenum, vanadium, antimony, nickel, copper, zinc, iron, manganese, niobium, gallium, tin, lead, cobalt, ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, and/or gold. The derivative i.e. first-derivative is doped using a dopant comprising: a second derivative of an element comprising yttrium, lanthanum, cerium, and selenium, where the first and second derivatives are intimate molecular mixture; a salt of an element comprising calcium, and/or magnesium, in molecular intimate mixture with primary derivative; aluminum hydrate, in molecular intimate mixture with primary derivative; and an oxide of an element comprising silica, and/or sulfur, in molecular intimate mixture with primary derivative. The molar quantity of dopant is less than or equal to 20%. EXAMPLE - Zirconium oxychloride (210 g) was added in a beaker under agitation. Water (300 ml) was added, and then sodium dodecyl sulfate (2.5 g) and sodium sulfate (52 g) were added and made up to 500 ml with deionized water. The temperature was adjusted to 50 degrees C and maintained for 15 minutes after complete dissolution of reagents. The solution was then stirred at 70 degrees C with a heating pad. The solution was maintained at 70 degrees C for 15 minutes and then left to cool until below 50 degrees C to obtain a suspension comprising a solid phase and a supernatant of liquid and foam. The suspension was then filtered and washed with water to obtain zirconium basic sulfate.