On the Structures of Alkali Polyaluminates. Yamaguchi, G. & Suzuki, K. Bulletin of the Chemical Society of Japan, 41(1):93–99, January, 1968. Publisher: The Chemical Society of Japan
On the Structures of Alkali Polyaluminates [link]Paper  doi  abstract   bibtex   
Besides the so-called β-Al2O3 (R2O·11Al2O3; R=Na or K), there have been found two kindred compounds with approximate formulas, R2O·7Al2O3 (β′-Al2O3) and R2O·5Al2O3(β″-Al2O3). The structure determination of the latter two compounds was undertaken; the results are compared with the structure of β-Al2O3 in the present paper. These three structures are composed of spinel layers of the same configuration. The structures of β and β′ are very similar to each other, both equally bearing a layer-stacking according to a two-fold screw symmetry, while β″ differs from these two in exhibiting another way of layer-stacking, according to a three-fold screw symmetry.
@article{yamaguchi_structures_1968,
	title = {On the {Structures} of {Alkali} {Polyaluminates}},
	volume = {41},
	issn = {0009-2673},
	url = {https://www.journal.csj.jp/doi/abs/10.1246/bcsj.41.93},
	doi = {10.1246/bcsj.41.93},
	abstract = {Besides the so-called β-Al2O3 (R2O·11Al2O3; R=Na or K), there have been found two kindred compounds with approximate formulas, R2O·7Al2O3 (β′-Al2O3) and R2O·5Al2O3(β″-Al2O3). The structure determination of the latter two compounds was undertaken; the results are compared with the structure of β-Al2O3 in the present paper. These three structures are composed of spinel layers of the same configuration. The structures of β and β′ are very similar to each other, both equally bearing a layer-stacking according to a two-fold screw symmetry, while β″ differs from these two in exhibiting another way of layer-stacking, according to a three-fold screw symmetry.},
	number = {1},
	urldate = {2022-02-01},
	journal = {Bulletin of the Chemical Society of Japan},
	author = {Yamaguchi, Goro and Suzuki, Kazutaka},
	month = jan,
	year = {1968},
	note = {Publisher: The Chemical Society of Japan},
	pages = {93--99},
}

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