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The System K2O-Al2O3-SiO2. Part 1. Phases on the KAlSiO4-KAlO2 join.

PB278421

Publication Date	1977
Personal Author	Cook, L. P.; Roth, R. S.; Parker, H. S.; Negas, T.
Page Count	11
Abstract	High temperature experiments have yielded information about the part of the tectosilicate join between KAlSiO4 and KAlO2. Orthorhombic KAlSiO4 synthesized at 950 C (a = 9.057(2), b = 15.642(2), c = 8.582(2)A), space group P2(sub 1) 2(sub 1) 2 transforms upon heating above 1450-1485 C to another orthorhombic phase having a larger unit cell (a = 18.110(3), b = 15.600(3), c = 8.560(2)A). The space group of the latter is shown from single-crystal precession photographs to be one of three possibilities: P2(sub 1)am, Pma2, or Pmam. A body-centered tetragonal phase, K(1+x) Al(1+x) Si(1-x)O4 (X=0.1), with unit-cell dimensions a = 8.943(1), c = 5.221(1)A is stable at the expense of orthorhombic KAlSiO4 and silica-saturated KAlO2 solid solution in the range 1400-1600 C. The compound previously reported to be K2Al2SiO6 is most likely a member of the f.c.c. solid solution K(1-x)Al(1-x)Si(x)O2. The SiO2-rich end-member of this solid solution has a composition with X=0.25 at 1600 C, and apparently belongs to Laue group m3m.
Keywords	Potassium oxides Aluminum oxide Silicon dioxide Phase diagrams Crystal structure Phase transformations Lattice parameters Reprints Kaliophilite Potassium aluminosilicates Potassium aluminates
Source Agency	National Institute of Standards and Technology
NTIS Subject Category	46D - Solid State Physics 48F - Geology & Geophysics
Corporate Authors	National Bureau of Standards, Washington, D.C.
Document Type	Journal Article
Title Note	Final rept.
NTIS Issue Number	197812

The System K2O-Al2O3-SiO2. Part 1. Phases on the KAlSiO4-KAlO2 join.

The System K2O-Al2O3-SiO2. Part 1. Phases on the KAlSiO4-KAlO2 join.
PB278421

Publication Date	1977
Personal Author	Cook, L. P.; Roth, R. S.; Parker, H. S.; Negas, T.
Page Count	11
Abstract	High temperature experiments have yielded information about the part of the tectosilicate join between KAlSiO4 and KAlO2. Orthorhombic KAlSiO4 synthesized at 950 C (a = 9.057(2), b = 15.642(2), c = 8.582(2)A), space group P2(sub 1) 2(sub 1) 2 transforms upon heating above 1450-1485 C to another orthorhombic phase having a larger unit cell (a = 18.110(3), b = 15.600(3), c = 8.560(2)A). The space group of the latter is shown from single-crystal precession photographs to be one of three possibilities: P2(sub 1)am, Pma2, or Pmam. A body-centered tetragonal phase, K(1+x) Al(1+x) Si(1-x)O4 (X=0.1), with unit-cell dimensions a = 8.943(1), c = 5.221(1)A is stable at the expense of orthorhombic KAlSiO4 and silica-saturated KAlO2 solid solution in the range 1400-1600 C. The compound previously reported to be K2Al2SiO6 is most likely a member of the f.c.c. solid solution K(1-x)Al(1-x)Si(x)O2. The SiO2-rich end-member of this solid solution has a composition with X=0.25 at 1600 C, and apparently belongs to Laue group m3m.
Keywords	Potassium oxides Aluminum oxide Silicon dioxide Phase diagrams Crystal structure Phase transformations Lattice parameters Reprints Kaliophilite Potassium aluminosilicates Potassium aluminates
Source Agency	National Institute of Standards and Technology
NTIS Subject Category	46D - Solid State Physics 48F - Geology & Geophysics
Corporate Authors	National Bureau of Standards, Washington, D.C.
Document Type	Journal Article
Title Note	Final rept.
NTIS Issue Number	197812