By E. Burzo (auth.), H.P.J. Wijn (eds.)
The magnetic houses of silicates and phosphates are compiled in subvolume 27I. whereas subvolume 27I1 (already released) bargains with orthosilicates, the current subvolume 27I2 bargains with sorosilicates. extra subvolumes are devoted to different kinds of silicates (cyclosilicates, inosilicates, phyllosilicates, tectosilicates) and to phosphates. - Silicates are very advanced platforms, masking huge sessions of minerals in addition to artificial samples. Their crystal constitution is mentioned and atomic positions are given. as well as magnetic homes, result of neutron diffraction reviews, nuclear gamma resonance, nuclear magnetic resonance, shipping houses, dielectric and optical information are reviewed.
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All four tetrahedral oxygen atoms are shared by adjacent silicon tetrahedra and the silicon tetrahedra are joined in pairs forming Si2O7 groups. The linkage of zinc and silicon tetrahedra results in an heterocyclic fivemembered tetrahedral ring. The rings link together to form a corrugated sheet parallel to c(001) and the adjacent sheets are held together by Ca–O bonds. The Zn–O bonding appear to have considerable covalent character [69L1]. Thus, the structure of hardystonite, can be summarized, as consisting of [ZnSi2O7]4– sheets within which the nature of bonding is dominantly covalent, the adjacent sheets being held together by Ca2+ ions with the interlayer bonding predominantly ionic in character.
Fresnoites (Ba2TiSi2O8, Sr2TiSi2O8) Fresnoite, Ba2TiSi2O8, is a non-centrosymmetric tetragonal crystal, having the space group P4bm. The fresnoite structure was determined by [67M1, 67M2, 69M1, 85M1]. This is formed by Si2O7 groups linked to square pyramidal TiO5 members, producing layers parallel to {001}. The Ba2+ cation, in ten-fold coordination, connects the layers - Fig. 13 [89C1]. The bonds within the sheet are predominantly covalent and the intersheet bonds are mainly ionic in character.
For. : Mater. Lett. : J. Solid State Chem. : Mater. Res. Soc. Symp. Proc. : Z. Kristallogr. 209 (1994) 7 Christensen, A. : Acta Chem. Scand. : Acta Chem. Scand. 51 (1997) 37 Christensen, A. , Jensen, A. , Themsen, B. , Hazell, R. : Acta Chem. Scand. : J. Mater. Sci. 32 (1997) 887 Izhevskii, V. : Powder Metall. Metal. Cer. : J. Cryst. : Acta Crystallogr. : J. Solid State Chem. : J. Solid State Chem. 2 Melilites and related silicates The silicates of melilite type are listed in Table 1 and classified according to Mineralogical Reference Manual as the group VIIIB02a [91N1, 99M1].