TY  - GEN
AU  - Seham Kamal Mohamed
AU  - Hamdy Mohamed Osman , 
AU  - Mohamed Amin Soliman , 
AU  - Sobhy Saeed Ibrahim , 
TI  - Construction of a crystallizer unit and its complete controlling systems and study of some parameters of TGS ferroelectric crystal / 
PY  - 2006///
CY  - Cairo : 
PB  - Seham Kamal Mohamed , 
KW  - Crystallizer
KW  - low - cost system
KW  - TGS crystal
N1  - Thesis (M.Sc.) - Cairo University - Faculty Of Science - Department Of Physics; Issued also as CD
N2  - The present study deals with constructing an automatic low - cost crystallizer systemThe study of the produced sample is important to judge the performance of the constructed unitA well - known TGS sample was grown and some physical properties of the produced crystal are measured and then compared it with its published resultsTriglycine sulfate (NH2CH2COOH) 3H2SO4 (TGS) is a well known ferroelectric material since 1956 , has large pyroelectric coefficient and low dielectric constant (40) and it has been an important material used in the fabrication of infrared (IR) detectorsPure TGS shows a typical second order ferroelectric phase transition at the Curie point TC=49?CAbove the Curie temperature it belongs to non - polar point group 2 / m of the monoclinic systemBelow TC , spontaneous polarization PS arises along the b - axis of the polar point group 2 of the monoclinic systemThe crystal is non piezoelectric in the paraelectric state
UR  - http://172.23.153.220/th.pdf
ER  -