Formation of zinc silicate in supercritical water followed with in situ synchrotron radiation X-ray diffraction

Thermal and chemical methods for producing zinc silicate (willemite): A review

“…They reported that Zn 2 SiO 4 was formed through an intermediate Zn 4 (OH) 2 Si 2 O 7 $ H 2 O phase in accordance [47,203] with a hydrothermal study [73], and stated that prismatic Zn 4 (OH) 2 Si 2 O 7 $ H 2 O grew on the surface of ZnO according to SEM images [99]. Takesue et al showed that a-phase Zn 2 SiO 4 :Mn 2þ crystallized via homogenous nucleation in supercritical water by observing in situ with a diamond anvil cell (HDAC) [203] and confirmed that the crystallization process of a-phase Zn 2 SiO 4 required only several ten seconds by in situ XRD measurements with synchrotron radiation [47]. Takesue et al also reported that a-phase Zn 2 SiO 4 :Mn 2þ (Fig.…”

Hydrothermal Synthesis of Metal Oxide Nanoparticles in Supercritical Water

“…Hydrothermal methods for preparing fine metal oxide particles in subcritical and supercritical water have been developed using batch reaction [4,5,6,7,8,9,10,11,12,13,14,15,16,32,33,34,35,36,37,38,39,40,41,42] and flow reaction systems [17,18,19,20,21,22,23,24,25,26,27,28,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,…”

Hydrothermal and Supercritical Water Processing of Inorganic Substances

“…An example, where the formation of the solid compound is observed in situ, is the formation of zinc-silicate in supercritical water [53]. The phase-formation mechanism of a-Zn 2 SiO 4 :Mn 2þ crystal in supercritical water was investigated in situ with synchrotron radiation X-ray diffraction [53].…”

“…An example, where the formation of the solid compound is observed in situ, is the formation of zinc-silicate in supercritical water [53]. The phase-formation mechanism of a-Zn 2 SiO 4 :Mn 2þ crystal in supercritical water was investigated in situ with synchrotron radiation X-ray diffraction [53]. Green-emitting a-Zn 2 SiO 4 :Mn 2þ crystals are formed at a temperature close to T ¼ 374 C, at a pressure of P ¼ 700 MPa, in a reaction time of t ¼ 400 s [53].…”