Differential Thermal Analysis and Mössbauer Studies in Rare‐Earth Orthoferrites

1964 ◽  
Vol 35 (3) ◽  
pp. 1071-1072 ◽  
Author(s):  
M. Eibschütz ◽  
G. Gorodetsky ◽  
S. Shtrikman ◽  
D. Treves
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Rare Earth ◽  
Mössbauer Studies

Infrared spectra and thermal decompositions of metal acetates and dicarboxylates

1968 ◽  
Vol 46 (2) ◽  
pp. 257-265 ◽  
Author(s):  
K. C. Patil ◽  
G. V. Chandrashekhar ◽  
M. V. George ◽  
C. N. R. Rao
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Differential Thermal Analysis ◽  
Rare Earth ◽  
Thermogravimetric Analysis ◽  
Infrared Spectra ◽  
Metal Acetate ◽  
Preliminary Results

The infrared spectra of rare earth acetates have been studied to examine the metal-acetate bonding. The thermal decomposition of rare earth acetates as well as lead and copper acetates have been investigated in detail by employing thermogravimetric analysis and differential thermal analysis. Thermal decomposition of calcium dicarboxylates (malonate to sebacate) have been studied employing t.g.a. and d.t.a. Infrared spectra of the dicarboxylates have also been studied. Preliminary results on the products of decomposition of dicarboxylates have been reported.

scholarly journals Stabilization of rare earth elements (La, Nd, Pr, Ce) by ZrO2 concentrate

2018 ◽  
pp. 39-45
Author(s):  
V. B. Kul'metyeva ◽  
S. E. Porozova ◽  
V. G. Gilev ◽  
D. S. Vokhmyanin
Keyword(s):  
Thermal Analysis ◽  
Raman Spectroscopy ◽  
Differential Thermal Analysis ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Phase Transformations ◽  
Tetragonal Phase ◽  
Cubic Phases

The effect of annealing and sintering temperatures on the phase transformations of ZrO2was studied depending on the content of REE concentrate using differential thermal analysis, Raman spectroscopy andX-ray diffraction. It is shown that the introduction of REE concentrate in an amount of more than 15 wt. % stabilizes the tetragonal phase of ZrO2only at temperatures below 1200 °C. A further increase in temperature leads to destabilization of the tetragonal phase with the formation of the monoclinic and cubic phases of theLn2Zr2O7type isostructural compounds (n= La, Nd, ...) with the pyrochlore structure.Ill. 8. Ref. 19. Tab. 1.

Tantal-aeschynite, a new mineral of the aeschynite group from the Borborema region, north-eastern Brazil

1974 ◽  
Vol 39 (305) ◽  
pp. 571-576 ◽  
Author(s):  
Maria S. Adusumilli ◽  
C. Kieft ◽  
E. A. J. Burke
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Rare Earth ◽  
Electron Microprobe ◽  
Earth Element ◽  
Morphological Data ◽  
New Mineral ◽  
X Ray ◽  
Eastern Brazil ◽  
North Eastern

SummaryTantal-aeschynite occurs as idiomorphic metamict crystals in the Raposa pegmatite at São José do Sabugí, Paraíba State, NE. Brazil. Morphological data, microscopic properties, and differential thermal analysis results are given. Electron-microprobe analyses yielded a formula: {Ca0·28(Yt,Ln)0·425(Th,U)0·11}(Ta0·75Ti0·62Nb0·595Fe0·05)O6. Yttrium is the predominant rare-earth element, with cerium and neodymium as most abundant lanthanides. The tantal-aeschynite unit cell has (after heating) a 5·34, b 10·97, c 7·38 Å. An indexed X-ray powder pattern (similar to that of aeschynite) is presented.

Zeolites Fit For A Crown: Probing Host-Guest Interactions with Thermogravimetric Methods

2018 ◽  
Author(s):  
Asel Sartbaeva ◽  
Paul R. Raithby ◽  
Remi Castaing ◽  
Antony Nearchou
Keyword(s):  
Mass Spectrometry ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Petrochemical Industry ◽  
Rational Use ◽  
New Methodologies ◽  
First Time ◽  
Kinetics Of

Through a combination of thermogravimetry, mass spectrometry and differential thermal analysis, we demonstrate for the first time that all four zeolites show experimental differences in their host-guest interactions with 18C6. In addition, we have estimated the kinetics of 18C6 decomposition, which is a technique that has not been applied to zeolites previously. Using these findings as a toolkit, a more rational use of OSDAs can be utilised to prepare designer zeolites. Furthermore, the new methodologies presented herein can be applied to current zeolites, such as MFI-type zeolites used in the petrochemical industry.

PHASE EQUILIBRIUM IN THE AS2TE3-TM2TE3 SYSTEM.

2020 ◽  
Vol 5 (8(77)) ◽  
pp. 65-68
Author(s):  
Teymur Mammad Ilyasly ◽  
Rahman Hasanaga Fatullazade ◽  
Zakir Islam Ismailov ◽  
Nigar Nadir Jafarova
Keyword(s):  
Thermal Analysis ◽  
Solid Solution ◽  
Differential Thermal Analysis ◽  
Phase Equilibrium ◽  
Physicochemical Properties ◽  
Thermal Effects ◽  
Isothermal Annealing ◽  
Intermediate Phase ◽  
Physicochemical Analysis ◽  
Two Phases

The synthesis of alloys of the system was carried out stepwise in rotary furnaces. The synthesis mode was selected based on the physicochemical properties of the elementary components. For homogenization, the alloys were subjected to isothermal annealing at 750 and 1275 K, depending on the Tm2Te3 concentration, for 250 h after homogenization of the alloys, they were subjected to physicochemical analysis. The results of differential thermal analysis showed that reversible thermal effects are observed in the alloys of the system. In alloys in a 1: 1 ratio, a new intermediate phase is formed with a composition corresponding to the TmAsTe3 compound. The homogeneity area is observed in the concentration range 52.5-47.5. It was found that in the concentration range 98.5-52.5 Tm2Te3 there are two phases - a mixture of β and of the solid solution, and in the concentration range of 47.51 mol% Tm2Te3 phases and α are in equilibrium. ) 66 The eutectic has coordinates of 11.5 mol Tm2Te3 at a temperature of 575 K.

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