Multicomponent solid solution with pyrochlore structure Branko Matovi¿; Jelena Maleta¿ki¿; Vesna Maksimovi¿; Stevan P. Dimitrijevi¿; Bratislav Todorovi¿; Milan Peji¿; Dejan Zagorac; Jelena Zagorac; Yu-Ping Zeng; Ivana Cvijovi¿-Alagi¿;