The crystal structure of LiAlSi<sub>2</sub>O<sub>6</sub>-II (“β spodumene”)

Li, Chi-Tang; Peacor, Donald R.

doi:10.1524/zkri.1968.126.1-3.46

Cited by 131 publications

(61 citation statements)

References 15 publications

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“…Although thermal expansivities are presented for only two members of the MnP-type compounds, the very low value along the c axis in comparison with that along the a axis for both compounds is consistent with the hypothesis that structures tend towards more symmetric arrangements of constituents with increasing temperature (Cartz, 1968;Li & Peacor, 1968). The assistance of Mrs P. G. Neiswander and Mr R. A. Trudo is gratefully acknowledged.…”

Section: Refinement and Resultssupporting

confidence: 72%

Crystal structure and linear thermal expansitivities of platinum silicide and platinum germanide

Graeber¹,

Baughman²,

Morosin³

1973

Acta Crystallogr Sect B

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Positional and thermal parameters for PtSi and PtGe have been refined by the full-matrix least-squares method using 123 and 131 three-dimensional intensity data, reslzectively. The compounds are isostructural with MnP, space group Pbnm, four formulae per cell, with lattice constants a=5"916 (1), b= 5.577 (1), c=3.587 (1)/~ for PtSi, and a=6"084 (2), b=5.719 (2), c=3.697 (1)/~ for PtGe. Linear thermal expansivities have been determined from the lattice constants measured as a function of temperature over the interval 100-900 °K for PtSi and 298-900 °K for PtGe. An anomaly in the expansivities for PtSi occurs at 400°K.

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Section: Refinement and Resultssupporting

confidence: 72%

Crystal structure and linear thermal expansitivities of platinum silicide and platinum germanide

Graeber¹,

Baughman²,

Morosin³

1973

Acta Crystallogr Sect B

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“…As already pointed out in the literature [28,40,41], both Si and Al in glassy LiAlSi 2 O 6 as well as in crystalline LiAlSi 2 O 6 in the -modification have the same coordination polyhedra. Both Si and Al are tetrahedrally coordinated forming a three-dimensional network.…”

Section: Al Mas Nmr and Ir Spectroscopysupporting

confidence: 58%

“…Differential thermoanalysis (DTA) showed a second order phase transition at T g = 960 K followed by an exothermal peak (crystallization) at 1120 K. Microcrystalline LiAlSi 2 O 6 was prepared by devitrification of the glass. The crystallization process was completed after heating the glass sample for five days at 1270 K. X-ray diffraction (XRD) measurements of the crystalline sample confirmed the phase purity and revealed the typical pattern of microcrystalline -spodumene [28]. XRD patterns were recorded with a Philips PW 1800 diffractometer (Bragg-Brentano geometry) using Cu K α radiation.…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

“…Therefore, the shift of the SiO asymmetric stretching vibration might be attributed to contributions of smaller Si-O-Si bond angles in the bond angle distribution in the glass [45,51,52,53]. In crystalline -spodumene, rings of 5, 6, and 7 tetrahedra exist in the network [28]. In the glass also smaller and larger rings do exist [54].…”

Section: Al Mas Nmr and Ir Spectroscopymentioning

confidence: 99%

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Li Ion Diffusion in Nanocrystalline and Nanoglassy LiAlSi₂O₆ and LiBO₂ - Structure-Dynamics Relations in Two Glass Forming Compounds

Kuhn¹,

Tobschall²,

Heitjans³

2009

Zeitschrift Für Physikalische Chemie

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In the present study the Li diffusivity in nanostructured samples of two glass forming model systems, spodumene (LiAlSi 2 O 6 ) and lithium metaborate (LiBO 2 ), was examined using 7 Li nuclear magnetic resonance (NMR) spin-lattice relaxometry and dc conductivity measurements. The nanostructured samples were prepared by high-energy ball milling of the respective crystalline starting material on the one hand and the corresponding glass on the other hand. The diffusivity of the glass exceeds that of the crystalline sample for both systems. However, when the crystalline samples are mechanically treated by ball milling the diffusivity is enhanced. Nevertheless, the diffusivity of these nanocrystalline samples remains lower than that of the corresponding glass. Surprisingly, when the glassy samples are treated in the same way the diffusivity decreases. After sufficiently long milling times the diffusivity of these nanoglassy samples approaches that of the nanocrystalline samples. This convergence effect seems to be due to structural relaxation processes as is suggested by supplementary infrared spectroscopy and 27 Al, 12B magic angle spinning NMR measurements.

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“…The properties of polycrystalline and of amorphous material with the same chemical composition were, e.g., explored in comparative studies on LiAlSi 2 O 6 glass and ␤-spodumene ͑␤-LiAlSi 2 O 6 ͒ polycrystals using NMR and conductivity spectroscopy. 3,4 In the present article we focus on 7 Li NMR, which is a valuable tool for the study of dynamics in various ion conducting materials; for reviews see, e.g., Refs. 5 and 6.…”

Section: Introductionmentioning

confidence: 99%

Ion hopping in crystalline and glassy spodumeneLiAlSi2O6:
Qi
¹
,
Rier
²
,
Böhmer
³

et al. 2005
Phys. Rev. B

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Nuclear magnetic resonance spectroscopy was used to study polycrystalline ␤-spodumene ͑␤-LiAlSi 2 O 6 ͒ as well as glassy specimens with the same chemical composition.7 Li spin-lattice relaxation measurements were carried out in a broad temperature range and for several Larmor frequencies. In addition to a pronounced rate maximum at high temperatures, stemming from the long-range Li motion in these aluminosilicates, we found a weak maximum in the crystalline modification near 120 K. The latter result confirms the existence of a local double-well structure in which the Li ions reside. The ionic motion was also monitored by solid-and stimulated-echo spectra as well as by the decay of the Jeener-Broekaert echo. Under conditions which are discussed in detail, the latter is a direct measure of the hopping correlation function. For the glass this function was found to decay faster and more stretched than that of the crystal at a given temperature. Furthermore, the relevant barriers against the high-temperature long-range Li motion are larger in the crystal as compared to the glass.

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The crystal structure of LiAlSi₂O₆-II (“β spodumene”)

Cited by 131 publications

References 15 publications

Crystal structure and linear thermal expansitivities of platinum silicide and platinum germanide

Crystal structure and linear thermal expansitivities of platinum silicide and platinum germanide

Li Ion Diffusion in Nanocrystalline and Nanoglassy LiAlSi₂O₆ and LiBO₂ - Structure-Dynamics Relations in Two Glass Forming Compounds

Ion hopping in crystalline and glassy spodumeneLiAlSi2O6:
Qi
¹
,
Rier
²
,
Böhmer
³

et al. 2005
Phys. Rev. B

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The crystal structure of LiAlSi2O6-II (“β spodumene”)

Cited by 131 publications

References 15 publications

Crystal structure and linear thermal expansitivities of platinum silicide and platinum germanide

Crystal structure and linear thermal expansitivities of platinum silicide and platinum germanide

Li Ion Diffusion in Nanocrystalline and Nanoglassy LiAlSi2O6 and LiBO2 - Structure-Dynamics Relations in Two Glass Forming Compounds

Ion hopping in crystalline and glassy spodumeneLiAlSi2O6:Qi1, Rier2, Böhmer3 et al. 2005Phys. Rev. B

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Product

Resources

About

The crystal structure of LiAlSi₂O₆-II (“β spodumene”)

Li Ion Diffusion in Nanocrystalline and Nanoglassy LiAlSi₂O₆ and LiBO₂ - Structure-Dynamics Relations in Two Glass Forming Compounds

Ion hopping in crystalline and glassy spodumeneLiAlSi2O6:
Qi
¹
,
Rier
²
,
Böhmer
³

et al. 2005
Phys. Rev. B