In situ spectroscopic studies of decomposition of ZrSiO₄during alkali fusion process using various hydroxides

Abstract

ZrSiO 4 powder synthesized by the sol-gel method is used to study the reaction mechanism of natural zircon mineral treated by an alkali fusion method. The reaction processes are analyzed by in situ Raman spectroscopy. Other characterization experiments using techniques, such as FTIR spectroscopy, TG-DTA and X-ray powder diffraction complement and verify the Raman spectroscopy study. The results reveal that hydroxylation-dehydration play important roles during the alkali-fusion process. Hydroxylation action breaks some bonds between Si and O in silicon-oxygen tetrahedral and releases zircon as ZrO 2 and silanol groups and then dehydration makes SiO 4 tetrahedron polymerize to the silicate with different lattice structure. The electron-donating ability of the O atom in molten alkali determines the number of Si-O bonds broken in SiO 4 tetrahedral and the lattice structure of silicate products. Finally, with further development of the reaction, the bridge-oxygen bonds of intermediate products are substitutes for nonbridging-oxygen bonds.

Preparation and characterisation of aluminium zirconium oxide for metal‐oxide‐semiconductor capacitor

“…It was perceived that Al x Zr y O z films grown at 800 C and 1000 C have disclosed the detection of Raman features allied with Zr-O-Si at 448.91 and 448.87 cm −1 as well as Al-Zr-Si-O at 353.36 and 351.61 cm −1 , respectively. 46,47 Hence, the formation of interfacial layer for Al x Zr y O z films grown at 800 C and 1000 C were comprised of a mixture of Zr-O-Si and Al-Zr-Si-O compounds. The detection of a larger area under Raman peaks associated to these compound for Al x Zr y O z films grown at 1000 C dictated the formation of the thickest interfacial layer, which was in agreement with the acquisition of the largest total oxide thickness (183.57 nm).…”

FTIR UNTUK CONTROL REAKSI STOIKIOMETRI PELEBURAN ZIRKON DENGAN NaOH

“…irkon (ZrSiO4) merupakan sumber utama untuk senyawa zirkonium berderajat industri, seperti ZrOCl2, Zr(SO4)2, ZrO2, ZrC, dll. [1]. Senyawa zirkonium derajat industri ini banyak digunakan dalam industri modern, seperti energi nuklir, katalis, penunjang katalis, keramik, sel bahan bakar, pigmen, dan sensor gas otomatis [1] [2].…”

“…[1]. Senyawa zirkonium derajat industri ini banyak digunakan dalam industri modern, seperti energi nuklir, katalis, penunjang katalis, keramik, sel bahan bakar, pigmen, dan sensor gas otomatis [1] [2]. Zirkon merupakan salah satu mineral yang paling stabil secara kimiawi, hal ini akibat dari ikatan koordinasi yang kuat dari bisdisphenoid ZrO8 dalam struktur tetragonal dengan tetrahedron SiO4 [1].…”

“…Senyawa zirkonium derajat industri ini banyak digunakan dalam industri modern, seperti energi nuklir, katalis, penunjang katalis, keramik, sel bahan bakar, pigmen, dan sensor gas otomatis [1] [2]. Zirkon merupakan salah satu mineral yang paling stabil secara kimiawi, hal ini akibat dari ikatan koordinasi yang kuat dari bisdisphenoid ZrO8 dalam struktur tetragonal dengan tetrahedron SiO4 [1]. Oleh karena itu diperlukan kondisi reaksi yang lebih agresif untuk penguraian struktur silikat yang cukup stabil tersebut, sehingga pelepasan logam bernilai seperti zirkonium dari jaringan ikat silikat dapat keluar [1].…”

In situ nano-sized ZrC/ZrSi composite powder fabricated by a one-pot electrochemical process in molten salts

“…Silica is more affiliative to capture CaO and form CaSiO 3 , and this result is quite similar to that reported by Wang. 25 Meanwhile, both of them can be reduced and alloyed to the ZrSi phase. Hence, in the rst hour of electrolysis, decomposition reactions and oxygen removal rather than carbiding reaction occurred on the cathode.…”