Acta Phys. -Chim. Sin. ›› 1987, Vol. 3 ›› Issue (02): 218-221.doi: 10.3866/PKU.WHXB19870219

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Xing Yan; Hu Ninghai; Zhou Qinglian; Hong Guangyan; Yue Shuying   

  1. Changchun Institute of Applied Chemist; Academia Sinica
  • Received:1985-07-26 Revised:1986-06-28 Published:1987-04-15

Abstract: The crystal of potassium terbium metaphosphate KTb(PO_3)_4 belongs to the monoclinic space group P2_1 with unit cell parameters a=0.7239(1) nm, b=0.8325(2) nm, c=0.7896(1) nm, β=91.82(1)°, V=0.4756 nm, Z=2. The structure was solved by heavy-atom method and the final R=0.034 after refining by block-diagonal least-squares method. The structure contains helical ribbons, (PO_3)_n, formed by cornersharing tetrahedra of PO_4. The coordination of the terbium by oxygen atoms is eight-fold with the geometry of dodecahedra. The shortest Tb—Tb distance is 0.6544 nm.