Thermal characterization of a montmorillonite, modified with polyethylene-glycols (PEG1500 and PEG4000), by in situ HT-XRD and FT IR: Formation of a high-temperature phase

2012 ◽  
Vol 59-60 ◽  
pp. 140-147 ◽  
Author(s):  
Luca Zampori ◽  
Giovanni Dotelli ◽  
Paola Gallo Stampino ◽  
Cinzia Cristiani ◽  
Federico Zorzi ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Characterization ◽  
High Temperature Phase ◽  
Polyethylene Glycols ◽  
Temperature Phase ◽  
Ft Ir

In Situ XRD Study of Zirconia Phase Transformation Produced from Chemical and Mineral Processes

2016 ◽  
Vol 840 ◽  
pp. 375-380
Author(s):  
Meor Yusoff Meor Sulaiman ◽  
Khaironie Mohamed Takip ◽  
Ahmad Khairulikram Zahari
Keyword(s):  
High Temperature ◽  
Heating Temperature ◽  
Tetragonal Zirconia ◽  
Amorphous Structure ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Zirconyl Chloride ◽  
High Temperature Xrd ◽  
Temperature Phase Transition

The high temperature phase transition of zirconia produced from commercial zirconyl chloride chemical was compared with that produced from a Malaysian zircon mineral. Zirconyl chloride was produced from zircon by using the hydrothermal fusion method. Initial XRD diffractogram of these samples at room temperature show that they are of amorphous structure. High temperature XRD studies was then performed on these samples; heated up to 1500°C. The XRD diffractograms shows that the crystalline structure of tetragonal zirconia was first observed and the monoclinic zirconia becomes more visible at higher heating temperature.

Facile synthesis and characterization of high temperature phase FeS2 pyrite nanocrystals

2012 ◽  
Vol 75 ◽  
pp. 152-154 ◽  
Author(s):  
Su-Ching Hsiao ◽  
Chih-Ming Hsu ◽  
Szu-Ying Chen ◽  
Yu-Hsun Perng ◽  
Yu-Lun Chueh ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Phase ◽  
Synthesis And Characterization ◽  
Temperature Phase ◽  
Facile Synthesis ◽  
Fes2 Pyrite

In situ high-temperature phase transformation studies on pyrite

Fuel ◽  
2009 ◽  
Vol 88 (6) ◽  
pp. 988-993 ◽  
Author(s):  
S.K. Bhargava ◽  
A. Garg ◽  
N.D. Subasinghe
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
High Temperature Phase ◽  
Temperature Phase

In Situ Observation of Growth Process of δ Phase of 0.15% C Carbon Steel during Solidification

2011 ◽  
Vol 299-300 ◽  
pp. 341-344
Author(s):  
Xu Dong Yue ◽  
Guang Can Jin ◽  
Shu Ying Chen ◽  
Guo Wei Chang
Keyword(s):  
Growth Rate ◽  
High Temperature ◽  
Carbon Steel ◽  
Growth Process ◽  
High Temperature Phase ◽  
Liquid Interface ◽  
Temperature Phase ◽  
Solid Liquid Interface ◽  
Solid Liquid

In situ observation of growth process of high temperature phase in 0.15% C carbon steel during solidification concerned with using Confocal Scanning Laser Microscope (CSLM), the growth rate of -phase has been measured. The results indicate that high temperature -phase grows at cell crystal way when the cooling speed reaches 2°C/min in 0.15% C carbon steel. The -phase of round or oval cross-sectional shaped may grow stably. The growth rate of -phase is gradually getting slow along with increasing of curvature radius. The variation of growth speed tends to be similar with different solid-liquid interface shapes of -phase. The growth rate of concave solid-liquid interface is faster than that of convex solid-liquid interface for phase. The smaller radius of curvature of phase is, the faster the growth rate reaches.

High-temperature X-ray powder diffraction analysis of selected ceramic mixtures

1994 ◽  
Vol 9 (1) ◽  
pp. 38-43 ◽  
Author(s):  
Sampath S. Iyengar
Keyword(s):  
High Temperature ◽  
Powder Diffraction ◽  
Inert Atmosphere ◽  
High Temperature Phase ◽  
Pure Oxygen ◽  
Temperature Phase ◽  
X Ray ◽  
Two Phases ◽  
Phase Relationships

The utility of ultra-high-temperature (2100 °C) X-ray powder diffraction technique for investigating the high-temperature phase relationships of two pseudobinary mixtures, Al2O3/Y2O3 and AlN/SiO2, is described. The in situ analysis to 1600 °C was carried out using a platinum holder and a Pt/Rh thermocouple; whereas analysis beyond 1600 °C was performed with a tungsten holder, extremely pure, oxygen-free inert gas environment, and an opticalpyrometer to monitor temperatures up to 2100 °C. The solid-state interaction between Al2O3 and Y2O3 commenced with the formation of Al2Y4O9 (YAM), a yttria rich compound, at 1300 °C followed by AlYO3 (YAP) and Al5Y3O12 (YAG) at 1400 °C. Further heating to 1500 °C and above resulted in the increased concentration of YAG at the expense of the other two phases, followed by melting of the entire sample at 2050 °C. The only phase formed during cooling (from the molten state) was YAG. AlN and SiO2 did not react with each other, in an inert atmosphere, and they remained as separate, discrete phases even at 1600 °C. In the presence of oxygen, they reacted to form mullite and cristobalite, or SIALON depending on the partial pressure of oxygen.

scholarly journals Synthesis and Characterization of the Amidomanganates Rb2[Mn(NH2)4] and Cs2[Mn(NH2)4]

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 676
Author(s):  
Christian Bäucker ◽  
Soeren Bauch ◽  
Rainer Niewa
Keyword(s):  
High Temperature ◽  
Single Phase ◽  
Inert Atmosphere ◽  
High Temperature Phase ◽  
Synthesis And Characterization ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ir Spectroscopic

We report the successful synthesis of Rb2[Mn(NH2)4] and Cs2[Mn(NH2)4] from ammonothermal conditions at 723 K and pressures above 850 bar. Both compounds were obtained single phase according to powder X-ray diffraction. The crystal structures were determined by single crystal X-ray diffraction. For Rb2[Mn(NH2)4] we have obtained the high-temperature phase. The structures are analyzed with respect to the earlier reported alkali metal amidomanganates. Upon heating in inert atmosphere Cs2[Mn(NH2)4] decomposes to manganese nitrides. IR spectroscopic results are reported.

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