title: Equation of state for Eu-doped SrSi₂O₂N₂.
abstract: α-SrSi2O2N2 is one of the recently studied oxonitridosilicates applicable in optoelectronics, in particular in white LEDs. Its elastic properties remain unknown. A survey of literature shows that, up to now, nine oxonitridosilicate materials have been identified. For most of these compounds, doped with rare earths and manganese, a luminescence has been reported at a wavelength characteristic for the given material; all together cover a broad spectral range. The present study focuses on the elastic properties of one of these oxonitridosilicates, the Eu-doped triclinic α-SrSi2O2N2. High-pressure powder diffraction experiments are used in order to experimentally determine, for the first time, the equation of state of this compound. The in situ experiment was performed for pressures ranging up to 9.65 GPa, for Eu-doped α-SrSi2O2N2 sample mounted in a diamond anvil cell ascertaining the hydrostatic compression conditions. The obtained experimental variation of volume of the triclinic unit cell of α-SrSi2O2N2:Eu with rising pressure served for determination of the Birch-Murnaghan equation of state. The determined above quoted bulk modulus is 103(5) GPa, its first derivative is 4.5(1.1). The above quoted bulk modulus value is found to be comparable to that of earlier reported oxynitrides of different composition.
authors.affiliation: Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, PL-02-668 Warsaw, Poland.
authors.forename: Olga
authors.initials: O
authors.lastname: Ermakova
authors.affiliation: Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, PL-02-668 Warsaw, Poland.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Paszkowicz
authors.affiliation: Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, PL-02-668 Warsaw, Poland.
authors.forename: Agata
authors.initials: A
authors.lastname: Kaminska
authors.affiliation: Institute of Experimental Physics, University of Gdańsk, ul. Wita Stwosza 57, PL-80-952 Gdańsk, Poland.
authors.forename: Justyna
authors.initials: J
authors.lastname: Barzowska
authors.affiliation: Institute of Experimental Physics, University of Gdańsk, ul. Wita Stwosza 57, PL-80-952 Gdańsk, Poland.
authors.forename: Karol
authors.initials: K
authors.lastname: Szczodrowski
authors.affiliation: Institute of Experimental Physics, University of Gdańsk, ul. Wita Stwosza 57, PL-80-952 Gdańsk, Poland.
authors.forename: Marek
authors.initials: M
authors.lastname: Grinberg
authors.affiliation: Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, PL-02-668 Warsaw, Poland.
authors.forename: Roman
authors.initials: R
authors.lastname: Minikayev
authors.affiliation: Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, PL-02-668 Warsaw, Poland.
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Nowakowska
authors.affiliation: MAX IV Laboratory, Lund University, SE-22100 Lund, Sweden.
authors.forename: Stefan
authors.initials: S
authors.lastname: Carlson
authors.affiliation: Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Guogang
authors.initials: G
authors.lastname: Li
authors.affiliation: Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Ru-Shi
authors.initials: RS
authors.lastname: Liu
authors.affiliation: Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, PL-02-668 Warsaw, Poland.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Suchocki