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High pressure optical study of KTbP2Se6 |
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| Authors: | JL BurrisI Orgzall CR EvensonPK Dorhout HD Hochheimer |
| Institution: | a Department of Physics, Colorado State University, Fort Collins, CO 80523, USA b Hochdrucklabor, Interdisziplinäres Forschungszentrum ‘Dünne Organische und Biochemische Schichten’, Universität Potsdam, Postfach 60 15 53, D14473 Potsdam, Germany c Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA |
| Abstract: | We have observed a pressure induced phase transition in KTbP2Se6 at about 9.2 GPa which was accompanied by a discontinuous jump of the absorption edge of about 0.5 eV into the red. We have proposed that the high pressure phase is due to charge transfer from the selenium to the phosphorous accompanied by the formation of a Se-Se bond. In order to exclude a model which involves a 4f-5d charge transfer in Tb, leading to the intervalence charge transfer from Tb3+P4+-Tb4+P3+,we have measured the pressure dependence of the luminescence of the crystal field split levels of the Tb-ion. A comparison of the pressure dependence of the luminescence spectra of KTb(MoO4)2 and KTbP2Se6 shows that such a charge transfer does not occur in KTbP2Se6. |
| Keywords: | A Inorganic compounds C High pressure C Optical properties |
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