A crystallographic study of a new compound of lanthanum silicon nitride, LaSi3N5

Ba1.63La7.39Si11N23Cl0.42:Ce3+ – A Nitridosilicate Chloride with a Zeolite‐Like Structure

“…The free radius (taking into account van der Waals radii of the network atoms) for mobile cations in the channels is 2.6 Å, along with a framework density of 17.7 tetrahedra per 1000 Å 3 . Comparable zeolite-like structures like Ba 6 Si 6 N 10 O 2 (CN 2 ), [18] zeolite beta [54] or [(C 4 NH 12 ) 4 M 4 Al 12 P 16 O 64 ] (M = Co, Zn) [55] have densities of 14.2, 15.1, and 17.9 tetrahedra per 1000 Å 3 . Continuous channels along [001] along with large cavities suggest possible ion exchange properties.…”

First-principles study ofCe3+-dopedlanthanum silicate nitride phosphors: Neutral excitation, Stokes shift, and luminescent center identification

“…Similar to the structural character of LaSi 3 N 5 , the crystal structure of La 3 Si 6 N 11 also consists of corner-sharing SiN 4 tetrahedra. The experimental data 10,12 have been used to start the initial optimization of the crystal structure (with the La 4f -semicore PAW atomic dataset). Table I lists the relaxed lattice parameters for the two nitride compounds.…”

Reaction synthesis and characterisation of lanthanum silicon nitride

“…The measurement conditions were: step 0.010 • ; rate 0.15 • /min, in the range 2Θ = 20 • -70 • . The results are summarized in Table 3 together with the published lattice parameters, 13,15,18 and values calculated in this work from the optimized structure of LaSi 3 N 5 .…”

“…14 Several synthesis procedures have been utilized to make LaSi 3 N 5 powder. The compound has been prepared by a reaction between Si 3 N 4 and La 2 O 3 at 2000 • C under 5 MPa nitrogen pressure 15 ; by hot pressing of Si 3 N 4 and LaN at 1830 • C for 1 h, under 28 MPa load 14 ; by direct reaction of Si 3 N 4 and LaN at 1700 • C for 30 min, under 14.7 MPa nitrogen pressure 16 ; by direct reaction of LaSi 3 alloys with nitrogen at 1500 • C and 0.1 MPa N 2 pressure for one week 13 ; by carbothermal reduction and nitridation (CRN) of La 2 O 3 and SiO 2 with carbon, 17 or by CRN of lanthanum acetate and tetraethoxysilane with carbon. 17,18 The oxygen content varied depending on the method of preparation between 1 and 2.5 wt%.…”