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Crystal chemical data on RbLn(SeO 4 ) 2 , where Ln=La, Ce, Pr or Nd
Author(s) -
Nabar M. A.,
Ajgaonkar V. R.
Publication year - 1982
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s002188988201262x
Subject(s) - crystallography , crystal (programming language) , x ray crystallography , chemistry , materials science , mineralogy , physics , diffraction , computer science , programming language , optics
The double selenates, RbLn(SeO 4 ) 2 (where Ln = La, Ce, Pr or Nd) are synthesized and studied crystallographically. These are monoclinic with space group P 2 1 / n containing four formulae per unit cell. The lattice parameters are: for RbLa(SeO 4 ) 2 , a = 8.036(8), b = 5.382(5), c = 18.11(2) Å, β = 92.00(12)°, V = 783 Å 3 , D obs = 4.34, D calc = 4.33 Mg m −3 ; for RbCe(SeO 4 ) 2 , a = 8.012(10), b = 5.376(7), c = 18.04(3) Å, β = 91.93(17)°, V = 777 Å 3 , D obs = 4.37, D calc = 4.37 Mg m −3 ; for RbPr(SeO 4 ) 2 , a = 7.969(11), b = 5.352(7), c = 17.91(3) Å, β = 91.67(13)°, V = 764 Å 3 , D obs = 4.43, D calc = 4.46 Mg m −3 ; for RbNd(SeO 4 ) 2 , a = 7.943(14), b = 5.333(10), c = 17.91(4) Å, β = 91.72(18)°, V = 758 Å 3 , D obs = 4.44, D calc = 4.52 Mg m −3 . The JCPDS Powder Diffraction File No. for RbCe(SeO 4 ) 2 is 33–1496.