Bonding in eight ordered clinopyroxenes isostructural with diopside

Clark, Joan R.; Appleman, Daniel E.; Papike, J. J.

doi:10.1007/bf00371067

Cited by 44 publications

(36 citation statements)

References 3 publications

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“…* Discussion. The structure is isomorphous with other sodic pyroxenes (Clark et al, 1969). Na occupies the M2 site which may be considered as a very distorted cubic antiprism, and Sc occupies the M 1 site which is a distorted octahedron.…”

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confidence: 98%

“…Scattering factors for O-and fully ionized cations were taken from Cromer & Mann (1968) and coefficients for anomalous dispersion from Cromer (1965). The positional parameters of NalnSi206 (Christiansen & Hazell, 1967) (4) O2C 1 -O2D I 3.0 i 2 (4) SHORT STRUCTURAL PAPERS (Clark et al, 1969) were used as the initial structural model. After several cycles of full matrix least-squares refinement, the structure converged with.…”

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confidence: 99%

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Refinement of the crystal structure of NaScSi2O6

Hawthorne¹,

Grundy²

1973

Acta Crystallogr Sect B

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confidence: 98%

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confidence: 99%

Refinement of the crystal structure of NaScSi2O6

Hawthorne¹,

Grundy²

1973

Acta Crystallogr Sect B

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“…The structure of the title compound is isostructural with NaA1Si206, NaCrSi206 and NaFeSi206 (Clark, Appleman & Papike, 1969), NaScSi206 (Hawthorne & Grundy, 1973), NaInSi206 (Hawthorne & Grundy, 1974, NaTiSi206 (Ohashi, Fujita & Osawa, 1982), NaGa(a)Si206 (Ohashi, Fujita & Osawa, 1983) NaMnSi206 (Ohashi, Osawa & Tsukimura, 1987) and NaVSi206 (Ohashi, Osawa & Sato, 1994).…”

Section: Commentmentioning

confidence: 96%

“…The calculated density (Dx) is 3.91 Mgm -3 and is higher than that (Dx = 3.89Mgm -3) of the NaGa(/3)Si206 pyroxene studied here. The atomic z coordinate for O1 [z = 0.1312 (7) Atom labelling follows that used by Clark et al (1969).…”

Section: Commentmentioning

confidence: 99%

Low-Density Form of NaGaSi2O6

Ohashi¹,

Osawa²,

Sato³

1995

Acta Crystallogr C

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pyroxene differs from that of the NaGa(fl)Si206 pyroxene.The O1--Si--O2 angle is the largest O---Si---O angle in the NaM3+Si206 pyroxenes. This may be due in part to the greater repulsion between the more negatively charged non-bridging O atoms. As shown in Fig. 2, the O1--Si---O2 angles correlate with the differences dbr-nbr in such a way that they follow three different trends: the Sc-Ti-V-Cr series, the MnFe-Ga(a) series and the A1-Ga(/3)-In series, where dbr-nbr = (Si--Obr) --(Si---Onbr) (br = bridging, nbr = non-bridging), (Si--Obr) = 1/2(Si--O3A1 + Si--O3A2) Acta Cryst. (1995 AbstractThe structure of the title compound, gallium sodium silicate, is similar to that of jadeite (NaA1Si206).Comparison of the new crystal-structure refinement for NaGaSi206 with published refinements for eleven NaM3+Si206 pyroxenes suggests that there are two different electronic states, Ga(a) and Ga(/3), for the octahedral Ga 3+ ion. Ga(o0 occurs in the Mn-Fe-Ga(c0 series and Ga(fl) in the A1-Ga(/3)-In series. CommentThe structure of the title compound is isostructural with NaA1Si206, NaCrSi206 and NaFeSi206 (Clark, Appleman & Papike, 1969), NaScSi206 (Hawthorne & Grundy, 1973), NaInSi206 (Hawthorne & Grundy, 1974, NaTiSi206 (Ohashi, Fujita & Osawa, 1982), NaGa(a)Si206 (Ohashi, Fujita & Osawa, 1983) NaMnSi206 (Ohashi, Osawa & Tsukimura, 1987) and NaVSi206 (Ohashi, Osawa & Sato, 1994).The cell parameters of the NaGa(a)Si206 pyroxene are: a = 9.557 (5), b = 8.679(4), c = 5.260(1)~, fl = 107.68 (2) ° and V = 415.7 (3)~3 (Ohashi et al., 1983). The calculated density (Dx) is 3.91 Mgm -3 and is higher than that (Dx = 3.89Mgm -3) of the NaGa(/3)Si206 pyroxene studied here. The atomic z coordinate for O1 [z = 0.1312 (7)

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“…Donnay (1969), Donnay & Allman (1970), Brown & Shannon (1973) and Brown & Wu (1976) proposed several empirical bond length-bond strength relationships. Clark, Appleman & Papike (1969) describe the interionic distances D U with a linear relation that explicitly disregards the crystal radius:…”

Section: Introductionmentioning

confidence: 99%