Summary
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1.
We have studied the region of celsian compositions in the system BaO-Al2O3-Ga2O3-SiO2-GeO2. Continuous solid solutions have been found over the whole concentration range of barium alumo (gallo) silicates (germanates).
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2.
For isomorphic mixtures with a monoclinic celsian lattice we have studied the dependences of refractive index and density on the composition. X-ray diffraction data are given.
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We would like to thank N. A. Toropov for his valiable advice and interest in the work.
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Grebenshchikov, R.G. Barium celsian alumo (gallo) silicates (germanates) of variable composition BaO·(AlmGa1-m)2O3·2(SinGe1-n)O2 . Russ Chem Bull 12, 189–196 (1963). https://doi.org/10.1007/BF00846380
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DOI: https://doi.org/10.1007/BF00846380