Chromites YbMCr₂O₅ (M = Li, Na, K, Cs):
X-Ray Diffraction Study

B. B. Tumataeva, B. K. Kasenov, S. Zh. Davrenbekov, E. S. Mustafin, Zh. I. Sagintaeva,
Sh. B. Kasenova, and S. T. Edil’baeva

AO Fitokhimiya Research Center, Ministry of Education and Science of the Kazakhstan Republic,
Karaganda, Kazakhstan
E-mail: phytoinform@nursat.kz

Received March 23, 2007

Abstract—Ytterbium alkali-metal chromites YbMCr₂O₅ (M = Li, Na, K, Cs) were synthesized by a ceramic pro-
cedure from the corresponding oxides and carbonates. Their crystal systems and unit cell parameters were deter-
mined by the homology method: for YbLiCr₂O₅, a = 10.34 Å, b = 10.62 Å, c = 15.05 Å, Z = 16, V^o = 1653.74 ų,
_X-ray = 5.85 g/cm³, _pycn = 5.81 0.03 g/cm³; for YbNaCr₂O₅, a = 10.30 Å, b = 10.56 Å, c = 16.46 Å, Z= 16,
V^o= 1790.32 ų, _X-ray = 5.64 g/cm³, _pycn = 5.59 0.07 g/cm³; for YbKCr₂O₅, a = 10.33 Å, b = 10.63Å, c = 19.93
Å, Z = 16, V^o = 2188.47 ų, _X-ray = 5.95 g/cm³, _pycn = 5.91 0.03 g/cm³; and for YbCsCr₂O₅, a = 10.34 Å, b =
10.63 Å, c = 18.43 Å, Z = 16, V^o = 2025.72 ų, _X-ray = 5.19 g/cm³, _pycn = 5.16 0.05 g/cm³.

DOI: 10.1134/S0036023609010069

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