MIXED LANTHANIUM-MAGNESIUM-GALLATES AND LASERS USING THESE GALLATES

摘要

1. Mixed lanthanide-magnesium gallate, characterized in that it is of formula : [La1-x Mx-1 ](1-z/3)k Mg(1-z)k [Ga1-v-t Mv-2 Crt ](11+z)k 019k in which M**1 is chosen from among neodymium, praseodymium, cerium, neodymium-cerium and praseodymium-cerium pairs, said elements being trivalent ; M**2 represents at least one trivalent element chosen from among aluminium, scandium and/or indium, provided that the total number of scandium and indium atoms per formula unit is below 0.15(11+z)k ; k represents a number between 0.94 and 1 ; x represents a number between 0 and 1 ; t represents a number such that 0 =< t =< 0.05, provided that t is Not= 0, when x = 0 and x is Not= 0 when t = 0 ; v represents a number such that 0 =< v+t < 1 ; z represents a number between 0 and 0.5 and wherein the gallate is monophase and has a magnetoplumbite-type crystalline structure.