A new class of ordered langasite structure compounds

Bridgman growth of langasite‐type piezoelectric crystals

“…One is disorder compound, such as LGS, LGN, LGT, SGG, etc., in which one or two cation sites are occupied by different cations; another is order compound, such as CNGS, SNGS, CTGS, STGS, etc., in which every cation site is occupied by single cation. Chai et al reported that disorder causes higher acoustic losses and also non-uniform mechanical properties, and the ordered crystals have the advantages of a lower Ga 2 O 3 content, high acoustic velocity and low acoustic loss [7]. Among this class ordered compounds, CNGS has the lowest melting point (1350°C or so) [19], which is beneficial for Bridgman growth.…”

Temperature dependence of acoustic property of Ca3Ta(Ga,Al)3Si2O14single crystals

“…[1][2][3][4][5] There have been some reports on the effects of Al substitution for the Ga site, i.e., Al substitution improves the piezoelectric constant and electrical resistivity of langasite-type single crystals. [6][7][8][9][10] The purpose of the substitution is to reduce the material cost and improve the above-mentioned properties.…”

Lattice vibration of Sr3TaGa3Si2O14 single crystal

“…In the past twenty years, the piezoelectric crystals with Ca 3 Ga 2 Ge 4 O 14 (CGG) structure have attracted a considerable amount of attention [1,2]. However, despite the large body of work on Gallate crystals such as La 3 Ga 5 SiO 14 (LGS), La 3 Nb 0.5 Ga 5.5 O 14 (LNG) and La 3 Ta 0.5 Ga 5.5 O 14 (LTG) [3][4][5][6][7], they have a major disadvantage: their structures are disordered [8]. This disadvantage was noticeable when they were investigated as piezoelectric crystals.…”

“…This disadvantage was noticeable when they were investigated as piezoelectric crystals. In order to find better piezoelectric crystals, some ordered langasite structure crystals were grown and investigated [8][9][10][11][12]. Recently, Sr 3 TaGa 3 Si 2 O 14 (STGS) crystal, as an ordered langasite structure crystal, received much attention.…”