High-Temperature Polymorph of In2La.

ChemInform ◽  
2005 ◽  
Vol 36 (16) ◽  
Author(s):  
E. R. Nieuwenhuis ◽  
Gary S. Collins ◽  
Aurelie Favrot ◽  
Matthew O. Zacate
Keyword(s):  
High Temperature ◽  
High Temperature Polymorph

scholarly journals Crystallization kinetics of BaO–Al2O3–SiO2 glasses

1989 ◽  
Vol 4 (5) ◽  
pp. 1257-1265 ◽  
Author(s):  
Narottam P. Bansal ◽  
Mark J. Hyatt
Keyword(s):  
High Temperature ◽  
Ceramic Composites ◽  
X Ray Diffraction ◽  
Aluminosilicate Glasses ◽  
Structural Applications ◽  
Barium Aluminosilicate ◽  
Kinetics Of ◽  
High Temperature Polymorph ◽  
Large Volume Change ◽  
Glass Compositions

Barium aluminosilicate glasses are being investigated as matrix materials in high-temperature ceramic composites for structural applications. Kinetics of crystallization of two refractory glass compositions in the barium aluminosilicate system have been studied by differential thermal analysis (DTA), x-ray diffraction (XRD), and scanning electron microscopy (SEM). From variable heating rate DTA, the crystallization activation energies for glass compositions (wt. %) 10BaO–38Al2O3–51SiO2–1MoO3 (glass A) and 39BaO–25Al2O3–35SiO2–1MoO3 (glass B) were determined to be 553 and 558 kJ/mol, respectively. On thermal treatment, the crystalline phases in glasses A and B were identified as mullite (3Al2O3 · 2SiO2) and hexacelsian (BaO · Al2O3 · 2SiO2), respectively. Hexacelsian is a high-temperature polymorph which is metastable below 1590 °C. It undergoes structural transformation into the orthorhombic form at ∼300 °C accompanied by a large volume change which is undesirable for structural applications. A process needs to be developed where stable monoclinic celsian, rather than hexacelsian, precipitates out as the crystal phase in glass B.

The High-Temperature Polymorph β-FeSO4. Stability, Magnetic Structure, and Magnetic Properties

1977 ◽  
Vol 40 (2) ◽  
pp. 447-453 ◽  
Author(s):  
A. Kirfel ◽  
W. Schäfer ◽  
G. Will ◽  
K. H. J. Buschow
Keyword(s):  
Magnetic Properties ◽  
High Temperature ◽  
Magnetic Structure ◽  
High Temperature Polymorph

A new quenchable high-temperature polymorph of FeSO4

1961 ◽  
Vol 48 (5) ◽  
pp. 129-129 ◽  
Author(s):  
Carl W. F. T. Pistorius
Keyword(s):  
High Temperature ◽  
High Temperature Polymorph

scholarly journals The Structure of a High-temperature Polymorph of V4As3.

1974 ◽  
Vol 28a ◽  
pp. 771-778 ◽  
Author(s):  
Rolf Berger ◽  
Arne Kjekshus ◽  
Tor A. Oftedal ◽  
S. J. Cyvin ◽  
Alf Bjørseth ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Polymorph
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