25  Conducting solids

Gover, Richard K. B.; Slater, Peter R.

doi:10.1039/b211502f

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“…[1,2] These features are correlated with the crystal structure of such silicates. The hexagonal apatite structure belongs to the space group P6 3 /m or P6 3 and may be represented by the general unit-cell formula M 10 (RO 4 ) 6 X 2 , where, in the case of ATLS, M is La or an alkaline earth ion, R is Si and X is an O ion.…”

Section: Introductionmentioning

confidence: 99%

Al‐Doped Apatite‐Type Nanocrystalline Lanthanum Silicates Prepared by Mechanochemical Synthesis: Phase, Structural and Microstructural Study

et al. 2008

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Al-doped La 9.33+x/3+y Si 6-x Al x O 26+3y/2 (x = 0-1.5, y = 0-0.67) apatite-type lanthanum silicates (ATLS) were synthesized with a high-power (1200 rpm) planetary ball mill that allows the formation of the lanthanum silicate phase after milling for 20-35 min at room temperature. The apatite phase already appears after milling for 5 min. Phase, structural and microstructural studies on the nanocrystalline lanthanum silicates were carried out by using XRD, TEM, and IR, 27 Al and 29 Si MAS NMR spectroscopy to clarify the mechanism of ATLS formation. The cluster-topotactic mechanism of the formation

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Section: Introductionmentioning

confidence: 99%