Synthesis of the Modifications of Ca&lt;sub&gt;2&lt;/sub&gt;SiO&lt;sub&gt;4&lt;/sub&gt; and the Determination of their Powder X-ray Diffraction Patterns

Yamaguchi, Goro; Ono, Yoshio; Kawamura, Shigeo; Soda, Yoshiaki

doi:10.2109/jcersj1950.71.806_63

Cited by 12 publications

(7 citation statements)

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“…CaCI2 (Czaya, 1970). The refined lattice constants (from 43 Guinier reflexions)are: a0 = 5.078 + 0.002/~ b0 = 11.225 + 0"003 co = 6-760 + 0.002 These values differ substamiaUy from those given by Smith et al (1963), but are in good agreement with the data given by Yannaquis (1955) and by Yamaguchi, Ono, Kawamura & Soda (1963). Of the possible space groups Pbnm and Pna21 the former, which is centrosymmetric, proved to be correct.…”

Section: (Received 26 May 1970)supporting

confidence: 77%

Refinement of the structure of γ-Ca₂SiO₄

Czaya¹

1971

Acta Crystallogr Sect B

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848SHORT COMMUNICATIONS The e.s.d, of position calculated from full-matrix least squares with space group Cc show that some of the atoms have highly significant deviations from the higher symmetry, indicating that Cc is correct.In cases where the space group is not absolutely certain, from a structural point of view it is safest (and cannot be wrong) to assume the lower symmetry. It is my view that the structure of dibenzyl disulphide is adequately described by Cc.

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Section: (Received 26 May 1970)supporting

confidence: 77%

Refinement of the structure of γ-Ca₂SiO₄

Czaya¹

1971

Acta Crystallogr Sect B

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“…Both the space groups were tested using the EXPO2004 package 38 for crystal structure determination. A promising structural model was successfully obtained in the space group Pnma , which corresponded to the structural model first proposed by Yamaguchi et al 2 for α′ H ‐C 2 S. There were six independent atoms in the asymmetric unit, five out of which were distributed over the 4 c sites lying on the (010) mirror plane. The structural parameters were refined by means of the Rietveld method using the computer program RIETAN‐2000 39 .…”

Section: Resultsmentioning

confidence: 60%

“…T he polymorphism of Ca 2 SiO 4 (C 2 S) has been studied extensively because of its importance in cement chemistry as well as in silicate mineralogy 1–7 . The polymorphic modifications established so far are, at ordinary pressures, γ, α′ L , α′ H , and α in order of increasing temperature.…”

Section: Introductionmentioning

confidence: 99%

Structural Disorder and Intracrystalline Microtexture of α′_H‐(Ba_0.24Ca_0.76)₂SiO₄

Fukuda

Hasegawa

Iwata

et al. 2007

Journal of the American Ceramic Society

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The structural disorder and twin microtexture of (Ba 0.24 Ca 0.76 ) 2 SiO 4 crystal were investigated by X-ray powder diffraction, precession method, and optical microscopy. The crystal at 298 K was orthorhombic (space group Pnma, Z 5 4) with a 5 0.70490(5) nm, b 5 0.55399(4) nm, c 5 0.95532(7) nm, and V 5 0.37306(4) nm 3 . The crystal structure was satisfactorily described by a split-atom model, involving the positional disorder of Ba/Ca and O atoms across the (010) mirror plane. The crystal was found to be isostructural with a 0 H -Ca 2 SiO 4 , thus regarded as the stabilized a 0 H phase. The crystal grain was composed of orthorhombic domains in three different orientations. The unit cells within each domain were related to one another by the threefold pseudo-symmetry axis lost during the a-to-a 0 H transition. Each domain was most probably made up of sub-domains of the two mirror-related structural configurations with P2 1 /n symmetry.

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“…Results and discussion 3.1 Phase constitution with P/(Si+P) ratio The phase constitution at ambient temperature (20) was classified into three categories (, and ) accord ing to the fraction of the -toH transition (Table 1). In ac cordance with the previous results,10) the time for the start of the -to-H transition and that for the finish should in crease steadily with increasing x.…”

Section: Characterizationmentioning

confidence: 99%

Structural Change in Phosphorus-Bearing Dicalcium Silicates

Fukuda

Maki

Ito

et al. 1997

J. Ceram. Soc. Japan

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Structures of (Ca22)(Si1P)4 crystals were examined as a function of x ranging from 0.03 to 0.40. All of the samples were heated at the stable temperature region of the -phase and then quenched in water. The phase constitution at ambient temperature was classified into three categories according to the fraction of the -to-H transition. When the transition was completed as in the crystals with x0.100, the and L phases were obtained, the relative amounts of which were determined by the start and finish temperatures of the L-to-martensitic transformation. With 0.125x0.150, the -totransition was incomplete. Dur ing further cooling, the product -phase was inverted to the L-phase, and the residual -phase was invert ed to the incommensurate phase successively. Because the start temperature of the L-to-transformation was lower than ambient temperature, the L-phase was stabilized. With x0.175, all of the crystals were free from the -totransition. The crystals with 0.175x0.225 were made up exclusively of the incom mensurate phase. A good correlation existed between the modulation wavelength (=N) and the P/(Si+P) ratio (=x) as N=4.134-1.56x(0.175x0.250). With 0.275x0.300, the crystals were isostructural with -Ca2Si4. The hexagonal phase with 0.350x0.400, probably a transition product from the -phase, showed two-dimensional modulations along the -axis with N=2 and along the c-axis with N=3.

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Synthesis of the Modifications of Ca<sub>2</sub>SiO<sub>4</sub> and the Determination of their Powder X-ray Diffraction Patterns

Abstract: Synthesisof the Modifications of Ca2SiO4 and the Determination of their Powder X-ray Diffraction Patterns

Cited by 12 publications

References 0 publications

Refinement of the structure of γ-Ca₂SiO₄

Refinement of the structure of γ-Ca₂SiO₄

Structural Disorder and Intracrystalline Microtexture of α′_H‐(Ba_0.24Ca_0.76)₂SiO₄

Structural Change in Phosphorus-Bearing Dicalcium Silicates

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Synthesis of the Modifications of Ca<sub>2</sub>SiO<sub>4</sub> and the Determination of their Powder X-ray Diffraction Patterns

Abstract: Synthesisof the Modifications of Ca2SiO4 and the Determination of their Powder X-ray Diffraction Patterns

Cited by 12 publications

References 0 publications

Refinement of the structure of γ-Ca2SiO4

Refinement of the structure of γ-Ca2SiO4

Structural Disorder and Intracrystalline Microtexture of α′H‐(Ba0.24Ca0.76)2SiO4

Structural Change in Phosphorus-Bearing Dicalcium Silicates

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Refinement of the structure of γ-Ca₂SiO₄

Refinement of the structure of γ-Ca₂SiO₄

Structural Disorder and Intracrystalline Microtexture of α′_H‐(Ba_0.24Ca_0.76)₂SiO₄