New zircon-manganites of lanthanum and alkali metals

Zircon-manganites of the composition LaMe2+ZrMnO6 (Me+ - Li, Na, K) were synthesized using the ceramic technology method in the range of 800-1200 degrees C by the interaction of lanthanum (III) oxides and lithium, sodium and potassium carbonates (analytical grade). Using X- ray diffraction methods, it was established that all synthesized zircon- manganites crystallize in a cubic system with the following lattice parameters: LaLi2ZrMnO6 - a = 16.26 +/- 0.02 angstrom; V-0 = 4300.93 +/- 0.06 angstrom(3); Z = 6; V-elem cell degrees = 716.82 +/- 0.02 angstrom(3); rho(x-ray) = 5.49 g/cm(3); rho(picn). = 5.42 +/- 0.06 g/cm(3); LaNa2ZrMnO6 - a= 16.85 +/- 0.02 angstrom; V-0 = 4785.46 +/- 0.02 angstrom(3); Z = 6; V-elem cell degrees = 795.58 +/- 0.02 angstrom(3); rho(x-ray) = 5.35 g/cm(3);rho(picn). = 5.30 +/- 0.04 g/cm(3); LaK2ZrMnO6 - a = 17.45 +/- 0.03 angstrom; V-0 = 5318.85 +/- 0.09 angstrom(3); Z = 6; V-elem cell degrees = 885.81 +/- 0.02 angstrom(3); rho(x-ray) = 5.16 g/cm(3); rho(picn). = 5.08 +/- 0.02 g/cm(3). It has been established that with an increase in ionic radii in the Li.Na.K series, the values of the parameter "a" and the volumes of lattices and unit cells of zircon- manganites increase.