TG-MS analysis as tool for the evaluation of clay mixtures

Carleer, Robert; Reggers, Guy; Ruysen, Marleen; Mullens, J.

doi:10.1016/s0040-6031(98)00500-0

Cited by 7 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…25 In order to identify the evolution of a gas, several m/z values corresponding with the gas were plotted as a function of time. 26 The carrier gas used was a dry air-like mixture of O 2 and N 2 (Air Liquide) at a flow rate of 75 mL min 21 . In all TGA-MS experiments a heating rate of 10 ‡C min 21 was applied.…”

Section: Methods and Apparatusmentioning

confidence: 99%

Phase formation of ferroelectric perovskite 0.75 Pb(Zn1/3,Nb2/3)O3–0.25 BaTiO3 prepared by aqueous solution–gel chemistry

et al. 2001

View full text Add to dashboard Cite

Here we report on the synthesis and phase formation of perovskite 0.75 Pb(Zn 1/3 ,Nb 2/3 )O 3 -0.25 BaTiO 3 (PZN-BT) by means of a new aqueous solution-gel method. The gelation process was optimized for an ammonium PZN acetate citrate precursor. The chemical homogeneity of this precursor was investigated by means of TEM-EDX analysis (Transmission Electron Microscopy-Energy Dispersive X-ray analysis). All metal ions were found to be homogeneously dispersed in the precursor gel at least down to 10 nm. An aqueous BaTiO 3 precursor was synthesized and its oxide formation was investigated by means of HT-XRD (High Temperature X-ray Diffraction) and TGA-MS (Thermogravimetric Analysis on-line coupled to Mass Spectrometry). The gel-to-oxide transition of the PZN-BT precursor was studied using HT-XRD and TGA-MS. It was concluded that 96z weight% perovskite PZN-BT could be formed out of the gel precursor if proper thermal treatment is applied (14 minutes sintering at 800 ‡C after fast firing at 50 ‡C min 21 ). Finally a phase formation mechanism for perovskite PZN-BT is proposed: perovskite 0.75 Pb(Zn 1/3 ,Nb 2/3 )O 3 -0.25 BaTiO 3 is formed out of a cubic pyrochlore PZN. At 850 ‡C the perovskite decomposes irreversibly into that same pyrochlore together with volatile PbO and ZnO. The evolution of PbO was proved with TGA.

show abstract

Section: Methods and Apparatusmentioning

confidence: 99%