Crystal Structures of Zr2Mn12P7and (Mo,Mn)12P7

Oryshchyn, Stepan; Zhak, Оlga; Députier, Stéphanie; Sénéchal, C. Le; Guérin, R.

doi:10.1023/b:inma.0000031995.10439.0a

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2006

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“…It will be interesting to re-examine disordered structures such as As 7 Ca 2 Co 12 [13] or P 7 Zr 2 Mn 12 [14] for the presence of small, stabilizing impurities.…”

Section: Discussionmentioning

confidence: 99%

On the crystallochemical origin of the disordered form of Ba₇^(EuII)F₁₂Cl₂ and the structural changes induced at high temperature

Kübel¹,

Hagemann²

2006

Cryst. Res. Technol.

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The crystal structure of the disordered modification of Ba 7 F 12 Cl 2 has been carefully re-examined on several new crystals prepared under different conditions of synthesis. All single crystal structure refinements reveal a residual electron density of ∼ 3 e -/Å 3 in the 0,0,0 position which is explained by the introduction of a small amount of sodium ions in the crystal. The title compound transforms from a disordered to an ordered modification at ~800°C. New structural data show a change in space group from P6 3 /m to P6. During this process, a slight chemical change and the formation of nano-channels in the crystals is observed by electron microscopy. These changes were further studied by electron microprobe analysis, by spectroscopic methods and thermal analysis.

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“…It will be interesting to re-examine disordered structures such as As 7 Ca 2 Co 12 [13] or P 7 Zr 2 Mn 12 [14] for the presence of small, stabilizing impurities.…”

Section: Discussionmentioning

confidence: 99%