scholarly journals Tailoring phase transition temperatures in perovskites via A-site vacancy generation

2017 ◽  
Vol 46 (22) ◽  
pp. 7253-7260 ◽  
Author(s):  
Thomas A. Whittle ◽  
William R. Brant ◽  
James R. Hester ◽  
Qinfen Gu ◽  
Siegbert Schmid
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Transition Temperatures ◽  
Temperature Dependent ◽  
Vacancy Generation ◽  
Phase Transition Temperatures ◽  
A Site ◽  
Site Vacancy

Tetragonal strain squared values for each composition across the Sr0.8Ti0.6−xZrxNb0.4O3, 0 ≤ x ≤ 0.6, series were used to accurately determine temperature dependent phase transitions (x = 0.6 is shown).

scholarly journals Thermal, ferroelastic, and structural properties near phase transitions of organic–inorganic perovskite type [NH3(CH2)3NH3]CdBr4 crystals

RSC Advances ◽  
2021 ◽  
Vol 11 (29) ◽  
pp. 17622-17629
Author(s):  
Ae Ran Lim
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Thermal Behavior ◽  
Structural Properties ◽  
Structural Dynamics ◽  
Transition Temperatures ◽  
Inorganic Perovskite ◽  
Phase Transition Temperatures ◽  
Perovskite Type

We studied the thermal behavior and structural dynamics of [NH3(CH2)3NH3]CdBr4 near phase transition temperatures.

Liquid Crystalline Norcholesterylesters: Influence of the Axial Methylgroups on the Phase Transitions and the Cholesteric Helix

1989 ◽  
Vol 44 (11) ◽  
pp. 1127-1130 ◽  
Author(s):  
H. Stegemeyer ◽  
K. Siemensmeyer ◽  
W. Sucrow ◽  
L. Appel
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Liquid Crystalline ◽  
Helical Structure ◽  
Transition Temperatures ◽  
Phase Transition Temperatures

Liquid crystalline norcholesteryl anisic esters were prepared in which the methylgroups 19, 21, 27, and 18 are removed successively from the cholestene skeleton. The influence of the axial methylgroups on the phase transition temperatures and the choleric helical structure has been investigated. On heating the 18.19.21.27-tetranorcholesteryl ester, at 155 °C an inversion of the helical screw sense from left to right was observed

Dilatometric Study on Phase Transitions of Benzylidene-p-n-hexadecyl /Hexadecyloxy Anilines (5.O16, 5O.O16 and 5.16)

2011 ◽  
Vol 181-182 ◽  
pp. 67-70
Author(s):  
M. Ramakrishna Nanachara Rao ◽  
P.V. Datta Prasad ◽  
D. Madhavi Latha ◽  
V.G.K.M. Pisipati
Keyword(s):  
Phase Transition ◽  
Schiff Base ◽  
Phase Transitions ◽  
Liquid Crystalline ◽  
The Body ◽  
Phase Identification ◽  
Transition Temperatures ◽  
Phase Transition Temperatures ◽  
Characterization Studies ◽  
Density Results

Synthesis, characterization and phase transition studies (Dilatometry) have been carried out on three mesomorphic Schiff base compounds viz., N-(p-n-pentyl benzylidene)-p-n-hexadecyloxy aniline, 5.O16, N-(p-n-pentyloxy benzylidene)-p-n-hexadecyloxy aniline 5O.O16 and N-(p-n-pentyl benzylidene)-p-n-hexadecyl aniline, 5.16. The liquid crystalline phase identification and the phase transition temperatures have been carried out using SDTECHS polarising microscope attached with temperature controller with accuracy of ± 0.1 °C and for the conformation of the phase identification and the textures observed are compared with the standard textures. Further, the phase transition temperatures and the corresponding heats of transition across the phase transitions are recorded using DSC (Perkin Elmer). The characterization studies reveal that these compounds exhibit NG, N and A phase variants respectively. The nature of the phase transitions are studied through density results using dilatometric technique. The phase transitions exhibit first order nature in all the cases as expected. The results are discussed in the light of the body of the data available on other Schiff base compounds and on 5O.16.

Phase Transition Temperatures of Divalent and Trivalent Ions Substituted (Bi1/2Na1/2)TiO3 Ceramics

2007 ◽  
Vol 350 ◽  
pp. 93-96 ◽  
Author(s):  
Yuji Hiruma ◽  
Yoshinori Watanabe ◽  
Hajime Nagata ◽  
Tadashi Takenaka
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Electrical Measurement ◽  
Transition Temperatures ◽  
Maximum Dielectric Constant ◽  
Phase Transition Temperatures ◽  
Temperature Dependences ◽  
A Site ◽  
The Relationship

The phase transition temperatures of divalent and trivalent ions substituted (Bi1/2Na1/2)TiO3 ceramics were investigated in detail by electrical measurement. BNT ceramics substituted by divalent (Ca2+, Sr2+ and Ba2+) and trivalent (La3+, Nd3+, Ho3+ and Yb3+) ions were prepared by conventional ceramic fabrication process. For these ceramics, the depolarization temperature, Td, the rhombohedral-tetragonal phase transition temperature, TR-T, and the temperature of the maximum dielectric constant, Tm, were determined on the basis of the temperature dependences of dielectric and piezoelectric properties. In this study, we demonstrated the relationship between phase transition temperature and ionic radius of ions substituted in the A-site of BNT ceramics.

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