Piezoelectric and elastic properties of SNGS and STGS single crystals at elevated temperatures

We have successfully grown high quality piezoelectric single crystals of Sr
3
NbGa
3
Si
2
O
14
(SNGS) and Sr
3
TaGa
3
Si
2
O
14
(STGS) by the Czochralski technique. The piezoelectric stress constant e
11
and dielectric permittivity ɛ
11
as well as elastic constants C
11
^E
and C
66
^E
were determined at temperatures up to 930°C for both crystals.