Jun 6, 2007 · Figure 1 Schematic representations of the four different long-range ordered structures for celsian MAl2Si2O8 (M = Ba, Sr).

Jun 12, 2019 · Q4(mAl) is the dominant structure type in fly ash, and there are generally nine sites, identified as Q4(mAl, m = 0–4) (−86, −90, −94, −98, ...

Si and 27Al MAS NMR studies of FA have shown that the vitreous aluminosilicate phase contains a distribution of Q4(mAl) Si species, with aluminium mainly ...

Further, the new peaks at − 104 and − 93 ppm, which could be assigned to mixed environments of Q 4 (mAl,nP) and Q 3 (or/and possibly Q 4 (2Al) silicon centers) ...

A new super-microporous aluminosilicate having a high aluminium content (Si/Al ca. 1) has been prepared through a surfactant-assisted procedure with the use ...

The 29Si NMR spectrum of the same sample shows one major peak at -112 ppm and a small shoulder centered at -105 ppm, signals assigned to Q3 and Q4 structure.

... Q4(mAl) environments. The broad resonance can be attributed to overlapping resonances due to Q2, Q2(1Al), Q3 and Q3(1Al) sites within a sodium and aluminium ...

Table 2), showing that some of the Al from the sodium aluminate had not entered the sodium aluminosilicate gel. The TRAPDOR fractions of the Q 4 (mAl) sites in ...

Apr 5, 2018 · ... aluminium-containing tobermorite (PDF # 00 ... (mAl) (where 0 ≤ m ≤ n ≤ 4) environments ... Consequently, the formation of Q4(4Al) and Q4 ...

... Q4(mAl) sites with m = 1…4. This resembles typical cementitious sodium aluminosilicate gels, which generally contain a distribution of Q4(mAl) sites with m ...