The preparation of tin-molybdenum oxides

Systematic and Controllable Negative, Zero, and Positive Thermal Expansion in Cubic Zr1–xSnxMo2O8

“…MoO 3 loss is consistent with ex situ studies of the synthesis of tin molybdenum oxides and explains the apparent rise in amorphous content at high temperatures. 38 Similar behavior is observed for samples with 0.5 ≤ x ≤ 1. For 0.2 ≤ x ≤ 0.5, the cubic material can be formed as the major crystalline phase (up to ∼85% cubic/15% trigonal at x = 0.2), though some amorphous component (10−20%) may still be present.…”

“…A stable (500−903 °C) SnMo 2 O 8 phase was claimed by early workers, 37 though others have failed to reproduce this, suggesting the sample was a binary oxide mixture. 38,39 There have, however, been two reports of preparation of SnMo 2 O 8 with a structure related to cubic ZrMo 2 O 8 via a low-temperature route that involves flowing SnCl 4 vapor in an O 2 carrier gas over solid MoO 3 . 39, 40 Little information has appeared on this material, and neither its physical properties nor its potential influence on NTE systems have been investigated.…”

“…The literature relating to the oxygen-rich part of the Sn–O–Mo system is a little confused. A stable (500–903 °C) SnMo 2 O 8 phase was claimed by early workers, though others have failed to reproduce this, suggesting the sample was a binary oxide mixture. , There have, however, been two reports of preparation of SnMo 2 O 8 with a structure related to cubic ZrMo 2 O 8 via a low-temperature route that involves flowing SnCl 4 vapor in an O 2 carrier gas over solid MoO 3 . , Little information has appeared on this material, and neither its physical properties nor its potential influence on NTE systems have been investigated. In this paper we report the development of a reliable and reproducible way to produce phase-pure SnMo 2 O 8 for the first time, allowing us to determine its complex structural landscape.…”

Catalytic Cooperation via Spillover of Oxygen: Dehydration—Dehydrogenation of 2-Butanol over SnO2—MoO3 Catalysts

“…Table I presents the specific areas measured for samples I to III. Considering these results, it is concluded that, as predicted from the literature, the true mixed oxide phase cannot be formed at low temperature (9)(10)(11)(12). The calcination of the mixed Sn/Mo precursor triggers the independant crystallisation of pure Sn02 and M0O3.…”

“…The decontamination of the system Sn02-Mo03was already reported in papers dealing with "impregnated catalysts" (15). However, the possibility that the samples I to III could be, at least partially, constituted of a solid solution of Mo in the Sn02, as suggested in several papers (10)(11)(12), could not be excluded. In this case, it is admitted that the amount of solid solution in the samples would decrease with the temperature of calcination.…”