Ferroelastic phase transition in LiCsSO4 embedded into molecular sieves

Dielectric Studies of Thiourea, SС(NH2)2, Embedded into Molecular Sieves

“…The transition temperatures usually shift compared to those in bulk and even the sequence of the phase transitions can be changed. Note that a shift was also observed for the ferroelastic phase transition under nanoconfinement [7].…”

“…Formally, the coupling with a matrix can be considered as a factor which affects the magnitude and sign of the extrapolation length. The experimental studies of many ferroelectric and ferroelastic materials embedded into molecular sieves MCM-41 and SBA-15 were carried out till now: Downloaded by [New York University] at 19:06 31 May 2015 NaNO 2 [13,24], LiCsSO 4 [7], KNO 3 and its mixtures [20,[25][26][27][28], TGS [29], (NH 4 ) 2 SO 4 [30], Rochelle salt [12]. The studies showed mostly a decrease of the transition temperature.…”

The elastic stiffness coefficients related to the ferroelastic phase transition of hexagonal crystals

“…(2) turns to the following slowness surface equation (4) The amplitude of a position vector on the slowness surface is . (5) According to the soft mode theory [6][7][8], the acoustic soft mode driving the ferroelastic phase transition means the vibration frequency of the acoustic mode decreasing to zero. When the vibration of particles of the crystal stop, they can not come back to their equilibrium positions.…”

“…Landau phenomenological theory [1][2][3] and the soft mode theory [4][5] were used to studyferroelastic phase transitions. The experimental methods such as X-ray diffraction [6][7][8], Brillion scattering [9][10][11][12][13] and Neutron diffraction [14][15] were also used to investigate ferroelatic phase transitions.…”

Диэлектрические И Тепловые Свойства KNO-=SUB=-3-=/SUB=-, Внедренного В Углеродные Нанотрубки

“…Свойства малых частиц в порах могут значительно изменяться по сравнению со свойствами объемных веществ за счет размерных эффектов, взаимодействия со стенками пор и межчастичного взаимодействия. Исследования сегнетоэлектрических наноструктур, полученных на основе пористых матриц, были проведены, например в [1][2][3][4][5][6]. В [1] сообщалось о стабилизации сегнетоэлектрической фазы сегнетовой соли в пористом оксиде алюминия вплоть до температуры разложения (328 K), которая примерно на 30 K выше температуры верхнего фазового перехода объемных образцов.…”