01797nab a2200205 i 4500001000400000003000400004005001700008008003900025040000800064041000800072044000800080100012500088245018200213260001000395500010700405520098100512773007201493942001301565999001301578BPPBPK20151210090206.0151210s2002    pl  |  |     |000 ||eng  cBPK  aeng  aPOL  aANDRIYEVSKYY, Bohdan.d2001 - .bPolitechnika Koszalińska - Wydział Elektroniki,cKatedra Elektroniki Ciała Stałego  aSimultaneous pyroelectric and dilatometric studies of phase transitions in triglycine sulphate and glycine phosphite crystals /cB. Andriyevsky, V. Kardash, S. Dacko, Z. Czapla.  c2001.  aDane z Informatora o publikowanych wynikach prac naukowo-badawczych w 2001 roku Wydziału Elektroniki.  aTemperature dependences of the linear dimension L(T) and spontaneous polarization Ps~((T) for triglycine sulphate and glycine phosphite single crystals have been measured in the same run of temperature. A decrease in the spontaneous electrostriction coefficient QL~( of both crystals studied is displayed when approaching the corresponding phase transition point T c~(. A temperature dependence of the coefficients QL~((T) shows that the rates of temperature changes of displacement of the atomic complexes of corresponding crystal structure forming the square of spontaneous polarization Ps~(2~) (promary order parameter) and the displacements of all atomic complexesforming the spontaneous linear thermal expansion δLs~(/L (secondary order parameter) are different. The applying external electric field E=3x105~) V/m to triglycine sulphate crystal does not influence essentially the temperature dependence of QL~((T) in the temperature range of phase transition below Tc~(.  iW :tActa Physica Polonica : A. -g2001, Vol. 99, No. 5, s. 593-600  cART2UKD  c129d129