Tm3Pr is beta Cu3Ti-like structured and crystallizes in the orthorhombic Cmcm space group. There are four inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to four equivalent Tm(1), four equivalent Tm(2), and four equivalent Pr(1) atoms to form TmPr4Tm8 cuboctahedra that share corners with four equivalent Tm(2)Pr4Tm8 cuboctahedra; corners with four equivalent Pr(1)Tm12 cuboctahedra; corners with ten Tm(1,1)Pr4Tm8 cuboctahedra; edges with six Tm(1,1)Pr4Tm8 cuboctahedra; edges with six equivalent Tm(2)Pr4Tm8 cuboctahedra; edges with six equivalent Pr(1)Tm12 cuboctahedra; faces with four equivalent Tm(2)Pr4Tm8 cuboctahedra; faces with four equivalent Pr(1)Tm12 cuboctahedra; and faces with twelve Tm(1,1)Pr4Tm8 cuboctahedra. In the second Tm site, Tm(1) is bonded to four equivalent Tm(1), four equivalent Tm(2), and four equivalent Pr(1) atoms to form TmPr4Tm8 cuboctahedra that share corners with four equivalent Tm(2)Pr4Tm8 cuboctahedra; corners with four equivalent Pr(1)Tm12 cuboctahedra; corners with ten Tm(1,1,1)Pr4Tm8 cuboctahedra; edges with six equivalent Tm(1)Pr4Tm8 cuboctahedra; edges with six equivalent Tm(2)Pr4Tm8 cuboctahedra; edges with six equivalent Pr(1)Tm12 cuboctahedra; faces with four equivalent Tm(2)Pr4Tm8 cuboctahedra; faces with four equivalent Pr(1)Tm12 cuboctahedra; and faces with twelve Tm(1,1)Pr4Tm8 cuboctahedra. In the third Tm site, Tm(2) is bonded to eight Tm(1,1,1) and four equivalent Pr(1) atoms to form TmPr4Tm8 cuboctahedra that share corners with four equivalent Pr(1)Tm12 cuboctahedra; corners with six equivalent Tm(2)Pr4Tm8 cuboctahedra; corners with eight Tm(1,1,1)Pr4Tm8 cuboctahedra; edges with six equivalent Pr(1)Tm12 cuboctahedra; edges with twelve Tm(1,1,1)Pr4Tm8 cuboctahedra; faces with four equivalent Pr(1)Tm12 cuboctahedra; faces with eight Tm(1,1,1)Pr4Tm8 cuboctahedra; and faces with eight equivalent Tm(2)Pr4Tm8 cuboctahedra. In the fourth Tm site, Tm(1) is bonded to four equivalent Tm(1), four equivalent Tm(2), and four equivalent Pr(1) atoms to form TmPr4Tm8 cuboctahedra that share corners with four equivalent Tm(2)Pr4Tm8 cuboctahedra; corners with four equivalent Pr(1)Tm12 cuboctahedra; corners with ten Tm(1,1,1)Pr4Tm8 cuboctahedra; edges with six equivalent Tm(1)Pr4Tm8 cuboctahedra; edges with six equivalent Tm(2)Pr4Tm8 cuboctahedra; edges with six equivalent Pr(1)Tm12 cuboctahedra; faces with four equivalent Tm(2)Pr4Tm8 cuboctahedra; faces with four equivalent Pr(1)Tm12 cuboctahedra; and faces with twelve Tm(1,1,1)Pr4Tm8 cuboctahedra. Pr(1) is bonded to four equivalent Tm(2) and eight Tm(1,1) atoms to form PrTm12 cuboctahedra that share corners with four equivalent Tm(2)Pr4Tm8 cuboctahedra; corners with six equivalent Pr(1)Tm12 cuboctahedra; corners with eight Tm(1,1)Pr4Tm8 cuboctahedra; edges with six equivalent Tm(2)Pr4Tm8 cuboctahedra; edges with twelve Tm(1,1,1)Pr4Tm8 cuboctahedra; faces with four equivalent Tm(2)Pr4Tm8 cuboctahedra; faces with eight Tm(1,1)Pr4Tm8 cuboctahedra; and faces with eight equivalent Pr(1)Tm12 cuboctahedra.
Tm3Pr is beta Cu3Ti-like structured and crystallizes in the orthorhombic Cmcm space group. There are four inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to four equivalent Tm(1), four equivalent Tm(2), and four equivalent Pr(1) atoms to form TmPr4Tm8 cuboctahedra that share corners with four equivalent Tm(2)Pr4Tm8 cuboctahedra; corners with four equivalent Pr(1)Tm12 cuboctahedra; corners with ten Tm(1,1)Pr4Tm8 cuboctahedra; edges with six Tm(1,1)Pr4Tm8 cuboctahedra; edges with six equivalent Tm(2)Pr4Tm8 cuboctahedra; edges with six equivalent Pr(1)Tm12 cuboctahedra; faces with four equivalent Tm(2)Pr4Tm8 cuboctahedra; faces with four equivalent Pr(1)Tm12 cuboctahedra; and faces with twelve Tm(1,1)Pr4Tm8 cuboctahedra. There are a spread of Tm(1)-Tm(1) bond distances ranging from 3.53-3.67 Å. There are a spread of Tm(1)-Tm(2) bond distances ranging from 3.53-3.67 Å. There are a spread of Tm(1)-Pr(1) bond distances ranging from 3.57-3.61 Å. In the second Tm site, Tm(1) is bonded to four equivalent Tm(1), four equivalent Tm(2), and four equivalent Pr(1) atoms to form TmPr4Tm8 cuboctahedra that share corners with four equivalent Tm(2)Pr4Tm8 cuboctahedra; corners with four equivalent Pr(1)Tm12 cuboctahedra; corners with ten Tm(1,1,1)Pr4Tm8 cuboctahedra; edges with six equivalent Tm(1)Pr4Tm8 cuboctahedra; edges with six equivalent Tm(2)Pr4Tm8 cuboctahedra; edges with six equivalent Pr(1)Tm12 cuboctahedra; faces with four equivalent Tm(2)Pr4Tm8 cuboctahedra; faces with four equivalent Pr(1)Tm12 cuboctahedra; and faces with twelve Tm(1,1)Pr4Tm8 cuboctahedra. There are a spread of Tm(1)-Tm(2) bond distances ranging from 3.53-3.67 Å. There are a spread of Tm(1)-Pr(1) bond distances ranging from 3.57-3.61 Å. In the third Tm site, Tm(2) is bonded to eight Tm(1,1,1) and four equivalent Pr(1) atoms to form TmPr4Tm8 cuboctahedra that share corners with four equivalent Pr(1)Tm12 cuboctahedra; corners with six equivalent Tm(2)Pr4Tm8 cuboctahedra; corners with eight Tm(1,1,1)Pr4Tm8 cuboctahedra; edges with six equivalent Pr(1)Tm12 cuboctahedra; edges with twelve Tm(1,1,1)Pr4Tm8 cuboctahedra; faces with four equivalent Pr(1)Tm12 cuboctahedra; faces with eight Tm(1,1,1)Pr4Tm8 cuboctahedra; and faces with eight equivalent Tm(2)Pr4Tm8 cuboctahedra. The Tm(2)-Tm(1) bond length is 3.54 Å. There are two shorter (3.57 Å) and two longer (3.61 Å) Tm(2)-Pr(1) bond lengths. In the fourth Tm site, Tm(1) is bonded to four equivalent Tm(1), four equivalent Tm(2), and four equivalent Pr(1) atoms to form TmPr4Tm8 cuboctahedra that share corners with four equivalent Tm(2)Pr4Tm8 cuboctahedra; corners with four equivalent Pr(1)Tm12 cuboctahedra; corners with ten Tm(1,1,1)Pr4Tm8 cuboctahedra; edges with six equivalent Tm(1)Pr4Tm8 cuboctahedra; edges with six equivalent Tm(2)Pr4Tm8 cuboctahedra; edges with six equivalent Pr(1)Tm12 cuboctahedra; faces with four equivalent Tm(2)Pr4Tm8 cuboctahedra; faces with four equivalent Pr(1)Tm12 cuboctahedra; and faces with twelve Tm(1,1,1)Pr4Tm8 cuboctahedra. There are a spread of Tm(1)-Tm(1) bond distances ranging from 3.53-3.67 Å. There are a spread of Tm(1)-Pr(1) bond distances ranging from 3.57-3.61 Å. Pr(1) is bonded to four equivalent Tm(2) and eight Tm(1,1) atoms to form PrTm12 cuboctahedra that share corners with four equivalent Tm(2)Pr4Tm8 cuboctahedra; corners with six equivalent Pr(1)Tm12 cuboctahedra; corners with eight Tm(1,1)Pr4Tm8 cuboctahedra; edges with six equivalent Tm(2)Pr4Tm8 cuboctahedra; edges with twelve Tm(1,1,1)Pr4Tm8 cuboctahedra; faces with four equivalent Tm(2)Pr4Tm8 cuboctahedra; faces with eight Tm(1,1)Pr4Tm8 cuboctahedra; and faces with eight equivalent Pr(1)Tm12 cuboctahedra.