Characterization of beryllium selenates by X‐ray powder diffraction, DTA and DSC | Zendy

Koleva V. G. | Zendy; Karadjova V. A. | Zendy; Georgiev M. P. | Zendy

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Characterization of beryllium selenates by X‐ray powder diffraction, DTA and DSC

Author(s) -

Koleva V. G.,

Karadjova V. A.,

Georgiev M. P.

Publication year - 2004

Publication title -

crystal research and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.377

H-Index - 64

eISSN - 1521-4079

pISSN - 0232-1300

DOI - 10.1002/crat.200410287

Subject(s) - orthorhombic crystal system , dehydration , chemistry , selenate , differential thermal analysis , lattice constant , crystallography , tetragonal crystal system , powder diffraction , analytical chemistry (journal) , diffraction , crystal structure , selenium , organic chemistry , biochemistry , physics , optics

BeSeO 4 .2H 2 O and BeSeO 4 have been studied röntgenographically: BeSeO 4 .2H 2 O forms orthorhombic crystals with lattice constants: a = 5.843(2) Å; b = 9.790(3) Å; c = 4.692(1) Å; V = 268.4(1) Å 3 . The crystals of BeSeO 4 are tetragonal: a = 4.648(1) Å; c = 7.084 (3) Å; V = 153.1(1) Å 3 , SG I $ \bar 4 $ . The thermal dehydration of BeSeO 4 .4H 2 O has been studied by TG, DTA and DSC methods. The dehydration occurs in four steps and intermediate hydrates BeSeO 4 .2H 2 O, BeSeO 4 .H 2 O and BeSeO 4 .0.5H 2 O are formed. The enthalpies of dehydration of the observed dehydration processes have been determined. The higher value of ΔH deh of BeSeO 4 .4H 2 O as compared to those of other metal selenate tetrahydrates is discussed in terms of the strong Be–H 2 O interaction. The enthalpies of formation of BeSeO 4 .4H 2 O and BeSeO 4 .2H 2 O have been calculated. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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