Synthesis, crystal structure, and luminescence properties of a new nitride polymorph, β-Sr0.98Eu0.02AlSi4N7

Fumitaka Yoshimura, Hisanori Yamane, Makoto Nagasako

研究成果: Article査読

3 被引用数 (Scopus)


Prismatic vermilion single crystals 200 µm–2 mm in size, together with a white powder, were obtained by heating a mixture of binary nitrides containing Mg3N2 at 2030 °C under 0.85 MPa of N2. Yellow, thick-platelet single crystals with sizes of 150–500 µm were also found to grow at or near the surface of the product. Single crystal X-ray diffraction demonstrated that the vermilion crystals were orthorhombic Sr0.98Eu0.02AlSi4N7, which has been prepared in previous studies and is termed the α phase of this compound. The yellow crystals were revealed to be a new polymorph of Sr0.98Eu0.02AlSi4N7 (β phase) that crystalized in a monoclinic cell (a = 8.1062(1) Å, b = 9.0953(1) Å, c = 8.9802(2) Å, β = 111.6550(5)°, space group P21) with twins that could be examined by transmission and scanning transmission electron microscopy. β-Sr0.98Eu0.02AlSi4N7 was found to have a three-dimensional network structure formed by the stacking of two types of layers. One is a dreier layer of (Al/Si)N4 tetrahedra that consists of N vertex-sharing double chains of (Al/Si)N4 tetrahedra extending in the c-axis direction with Sr and Eu atoms aligned between the chains, while the other is a layer of (Al/Si)N4 tetrahedra connected by sharing N edges and vertexes. The crystal structure of β-Sr0.98Eu0.02AlSi4N7 is similar to those of certain oxynitrides, such as Sr3Al3+xSi13−xN21−xO2+x:Eu2+ (x ≈ 0) and Sr4.9Eu0.1Al5+xSi21−xN35−xO2+x (x ≈ 0). The peak wavelength and full width at half maximum in the emission spectrum obtained from single crystals of β-Sr0.98Eu0.02AlSi4N7 under excitation at 400 nm were 541 and 66 nm, respectively.

ジャーナルJournal of Solid State Chemistry
出版ステータスPublished - 2018 2

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

フィンガープリント 「Synthesis, crystal structure, and luminescence properties of a new nitride polymorph, β-Sr<sub>0.98</sub>Eu<sub>0.02</sub>AlSi<sub>4</sub>N<sub>7</sub>」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。