Synthesis of Li₂ZrSi₆O₁₅, a zektzerite-related phase

Abstract

Considerable recent interest has been shown in a group of double-chain silicate phases which includes the new mineral zektzerite, LiNaZrSi6O15 (Dunn et al., 1977; Ghose and Wan, 1978), and a family of isotypic phases (Marr and Glasser, 1979a and b). These phases are closely related structurally to Na2Mg2Si6O15 (Cradwick and Taylor, 1972), tuhualite, (Na,K)2Fe2+2Fe3+2Si12O30.H2O (Merlino, 1969), and emeleusite, Na2LiFeSi6O15 (Upton et al., 1978).

LZS/Al2O3 nanostructured composites obtained by colloidal processing and spark plasma sintering

“…Figure 8 shows the X-ray diffraction patterns, and The phase analysis reveals that the LZS material subjected to the conventional firing process has 2.3% ZrSiO4, 20.8% Li2Si2O5, 2.6% Li2SiO3 and 74.3% Li2ZrSi6O15 phase. This last is probably the most stable phase for this system, and has already been found in Li2O-ZrO2-SiO2-systems with other molar compositions obtained either by reaction in the solid state or by sol-gel synthesis [29][30][31]. When Al2O3 is added, there is a gradual decrease of the crystalline phase Li2ZrSi6O15 and also of the Li2Si2O5, besides the formation of LiAlSi2O6 with a considerable increase of the relative amounts of the phases ZrSiO4 and Li2SiO3.…”

Sol–gel synthesis of Li2ZrSi6O15 powders

“…In the literature we have found only two papers, those written by Quintana and West, 11,12 Although the use of metal alkoxides to obtain homogeneous glasses and ceramics via the sol±gel method has been widely explored, 13±16 there is no published source dealing with the preparation of lithium silicozirconates by the sol±gel method, a technique which includes the following steps: metallic alkoxides are mixed independently or in combination with other compounds, water is added and hydrolysis and condensation and a controlled polycondensation are performed, thus providing a gel. 15,16 Therefore, the purpose of this paper is to obtain Li 2 ZrSi 6 O 15 by the sol±gel method and to determine the composition and structure of the resulting material.…”

Hydrothermal crystallization of a radioactive waste storage glass

“…Its structure has been investigated by Ghose and Wan (1978) and Marr and Glasser (1979), whose studies revealed that zektzerite contains a six-repeat unit double chain silicate anion ('sechserdoppelkette') and that a wide variety of cation substitutions is possible. Thus zektzerite, LiNaZrSi6015 is isostructrual with tuhualite, (Na,K)2Fe4Si12030 (Merlino, 1969), emeleusite, Na2LiFeSi6015 (Upton et al, 1978), LizZrSi6Ox5 (Quintana and West, 1981), and a series of phases of the general formula LiNa2M3+Si6015, where M 3+ = Fe,Cr, Sc,In,Y,(Yb + Lu),Er,Ho,Dy,Gd,Sm (Marr and Glasser, 1979). Therefore, there is considerable scope for the incorporation of a number of cations of radiological significance in the zektzerite structure, although the mineral synthesized in these experiments only included trace amounts of Zn, Mo, and U Savage and Chapman, 1982).…”