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Progressive pressure-induced transformation from isolated MnX4 (Td) to exchange-coupled MnX6 (Oh) systems in A2MnX4 (X:Cl,Br) crystals

DOI: 10.1088/1742-6596/215/1/012043 DOI Help

Authors: Y. Rodriguez-lazcano (Universidad de Cantabria) , L. Nataf (Universidad de Cantabria) , F. Aguado (Univ Cantabria) , F. Rodriguez (Universidad de Cantabria) , A. Jephcoat (Diamond Light Source) , H. Wilhelm (Diamond Light Source)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: Proceedings of the AIRAPT Conference, Tokyo (2009)
Peer Reviewed: Yes

State: Published (Approved)
Published: January 2010
Diamond Proposal Number(s): 891

Abstract: This work reports a correlation study between the crystal structure and photoluminescence (PL) in A(2)MnX(4) (A: [CH(3)](4)N; X: Cl, Br) by means of simultaneously optical spectroscopy and x-ray diffraction (XRD) under pressure. These materials are attractive systems for PL studies under pressure since they are very compressible and the interaction between organic/inorganic ((CH(3))(4)N(-)/MnX(4)(2-)) tetrahedra strongly affects the PL efficiency, which is fully related to the isolated T(d) MnX(4)(2-). We show that pressure induces strong redshifts of emission peak of MnX(4)(2-) as well as decomposition processes at higher pressures yielding new aggregated phases of Mn(2+) and amorphization which deeply affect Mn(2+) PL. The equation of state of each compound is reported from XRD data.

Journal Keywords: Amorphous State; Correlations; Crystal Structure; Crystals; Decomposition; Emission Spectroscopy; Equations Of State; Manganese Bromides; Manganese Chlorides; Manganese Ions; Organic Nitrogen Compounds; Phase Transformations; Photoluminescence; Pressure Dependence; X-Ray Diffraction

Subject Areas: Physics, Chemistry, Materials

Instruments: I15-Extreme Conditions

Added On: 30/03/2010 00:07

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