Flux growth, structural studies and spectroscopy of K2NdNb5O15 and Nd:K2LaNb5O15 crystals

Phase transition and conduction mechanism of rare earth based tungsten-bronze compounds

“…devices at room temperature [3][4][5][6][7][8][9][10][11][12][13]. Rare-earth ion-doped compounds have particularly received a considerable attention [14][15][16][17] of researchers because of their better structural stability and enhanced properties. The TB structures of a general formula [(A 1 ) 2 (A 2 ) 4 ](C) 4 [(B 1 ) 2 (B 2 ) 8 ]O 30 have complex chains of distorted BO 6 octahedral with three different types of interstices (A 1 ), (A 2 ) and (C) having 12-,15-and 9-fold coordination, respectively.…”

“…The TB structures of a general formula [(A 1 ) 2 (A 2 ) 4 ](C) 4 [(B 1 ) 2 (B 2 ) 8 ]O 30 have complex chains of distorted BO 6 octahedral with three different types of interstices (A 1 ), (A 2 ) and (C) having 12-,15-and 9-fold coordination, respectively. The B 1 and B 2 sites, arising from two types of BO 6 octahedron, have C 2v and C 1 symmetry, respectively [15][16][17][18][19]. Moreover, the A-site is occupied by mono to tri-valence cations, Bsites occupied by tetra to hexa-valent ions (W +6 , Ti +4 , Nb +5 , Ta +5 , V +5 ) and C-site either unfilled or occupied by small ions.…”

Structural and Electrical Properties of Complex Tungsten Bronze Ferroelectrics ; Li2Pb2La2W2Ti4V4O30

“…In this structure mono or divalent cations can be accommodated at the A-sites (A 1 and A 2 ), tri or pentavalent cations at octahedral sites (B 1 and B 2 ) and C-site is generally have small ions or empty. It is expected that the substitutions of varieties of cations at the A and B sites change the crystal structure and physical properties of materials significantly due to their different atomic/ionic size and charge distribution [11][12][13][14][15]. Most of the TB structure belongs to tetragonal or orthorhombic structure with small distortion of multiple perovskites.…”

Growth, structure and spectroscopic characterization of a new laser crystals Nd3+:Li3Ba2Gd3(WO4)8

“…Recently the tungstate crystals have been widely investigated as a new laser host material [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. For example, Nd 3+ :KGd(WO 4 ) 2 crystal exhibited the high efficiency for stimulated emission at low pumping energies with diode laser pumping [9]; KYb(WO 4 ) 2 crystal was regarded as a potential candidate for microchip laser medium [13].…”