scholarly journals Study of Temperature Behaviour on Thermally Induced Vibration of Non-Homogeneous Trapezoidal Plate with Bi-Linearly Varying Thickness

2016 ◽  
Vol 04 (10) ◽  
pp. 1936-1948
Author(s):  
&nbsp Kavita ◽  
Satish Kumar ◽  
Pragati Sharma
Keyword(s):  
Temperature Behaviour ◽  
Thermally Induced ◽  
Varying Thickness ◽  
Trapezoidal Plate

scholarly journals Analysis of free vibration of non-homogenous trapezoidal plate with 2D varying thickness and thermal effect

2016 ◽  
Vol 4 (4) ◽  
pp. 201-208 ◽  
Author(s):  
Ashish Kumar Sharma ◽  
Amit Sharma ◽  
A. K. Raghav ◽  
Vijay Kumar
Keyword(s):  
Free Vibration ◽  
Thermal Effect ◽  
Varying Thickness ◽  
Trapezoidal Plate

scholarly journals In situ high-temperature behaviour of fluor-elbaite: breakdown conditions and products

2021 ◽  
Vol 48 (6) ◽  
Author(s):  
Beatrice Celata ◽  
Paolo Ballirano ◽  
Giovanni B. Andreozzi ◽  
Ferdinando Bosi
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
Structural Parameters ◽  
Unit Cell ◽  
Temperature Behaviour ◽  
Unit Cell Parameters ◽  
Thermally Induced ◽  
X Ray ◽  
Cell Parameters

AbstractThe thermal behaviour of a fluor-elbaite from Minas Gerais (Brazil) was investigated at room pressure through in situ high-temperature X-ray powder diffraction (HT-XRPD), until the breakdown conditions were reached. The variations of fluor-elbaite structural parameters (unit-cell parameters and mean bond distances) were monitored together with site occupancies, and two main internal reactions were identified: the thermally-induced Fe oxidation process counterbalanced by (OH)– deprotonation, which starts at 500 °C (773 K), followed by a partial intracrystalline Fe–Al exchange between the octahedrally-coordinated Y and Z sites. The fluor-elbaite breakdown reaction occurs between 850 °C (1123 K) and 900 °C (1173 K). The breakdown products were identified at room temperature by XRPD and the breakdown reaction can be described by the following reaction: tourmaline → B-bearing mullite + hematite + spinel + B-poor (Na, Li, H2O)-bearing glass. Boromullite itself was not observed in the final heating products, and the B-bearing mullite from the breakdown reaction exhibited unit-cell parameters a = 7.5382(2) Å, b = 7.6749(2) Å, c = 2.8385(1) Å, V = 164.22(1) Å3 (space group Pbam) consistent with an approximate Al8.5B1.5Si2O19 composition.

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