SOLID SOLUTION MATERIAL OF RARE EARTH ELEMENT FLUORIDE (POLYCRYSTAL AND SINGLE CRYSTAL), AND RADIATION DETECTOR AND TEST DEVICE

摘要

A rare earth fluoride solid solution material (polycrystal and/or single crystal) characterized in that the material is obtained by mutually combining a plurality of rare earth fluorides having phase transitions and having different ion radii, respectively, so that the rare earth fluoride solid solution material is free of phase transitions. A rare earth fluoride solid solution material (polycrystal and/or single crystal) characterized in that the material is represented by (REyRE'1-y)F3 (0.0000y1.0000), wherein RE represents one or two or more selected from Sm, Eu, and Gd, and RE' represents one or two or more selected from Er, Tm, Yb, Lu, and Y. A rare earth fluoride solid solution material (polycrystal and/or single crystal) represented by MxREyRE'1-x-yFz., wherein RE is one or two or more selected from Ce, Pr, Nd, Eu, Tb, Ho, Er, Tm, or Yb, RE' is one or two or more selected from La, Sm, Gd, Dy, Lu, Y, and Sc, and M is one or more of Mg, Ca, Sr, and Ba.