Garnets in the majorite–pyrope system: symmetry, lattice microstrain, and order–disorder of cations

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Marco E. Ciriotti
Messaggi: 23139
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Garnets in the majorite–pyrope system: symmetry, lattice microstrain, and order–disorder of cations

Messaggio da Marco E. Ciriotti » mar 18 ott, 2016 2:27

Prossima pubblicazione.

Referenza:
▪ Liu, Z., Du, W., Shinmei, T., Gréaux, S., Zhou, C., Arimoto, T., Kunimoto, T., Irifune, T. (2017): Garnets in the majorite–pyrope system: symmetry, lattice microstrain, and order–disorder of cations. Physics and Chemistry of Minerals, 44, (in press).

Abstract:
We present a systematic experimental study on the phase transition, lattice microstrain, and order–disorder of cations for garnets in the majorite–pyrope system. Polycrystalline gem-quality garnets were synthesized at high pressure and high temperature using a Kawai-type multi-anvil apparatus. A phase transition from a cubic to tetragonal structure is clearly observed for garnets with the majorite content of more than 74 mol % through X-ray diffraction (XRD) and Raman scattering studies. Microstrain of garnets, evaluated with the Williamson–Hall plot on XRD profiles, shows a nonlinear dependence of the garnet compositions. The variation of the XRD peak broadening suggests the lattice microstrain of these garnets may be associated with the local structural heterogeneities due to the substitution of different cations via the coupled substitution (Mg2+ + Si4+ = 2Al3+) in the garnet structure. The width variation of Raman scattering peaks indicates that cation disorder occurs in the garnet structure for intermediate compositions. It is found that intermediate garnets and end-members have a minimum of microstrain, while those between end-members and intermediate compositions possess a larger microstrain.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

Avatar utente
Marco E. Ciriotti
Messaggi: 23139
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Garnets in the majorite–pyrope system: symmetry, lattice microstrain, and order–disorder of cations

Messaggio da Marco E. Ciriotti » ven 07 apr, 2017 10:04

Pubblicazione effettuata.

Referenza:
▪ Liu, Z., Du, W., Shinmei, T., Gréaux, S., Zhou, C., Arimoto, T., Kunimoto, T., Irifune, T. (2017): Garnets in the majorite–pyrope system: symmetry, lattice microstrain, and order–disorder of cations. Physics and Chemistry of Minerals, 44, 237-245.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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