Thermodynamic analyses of the orthorhombic-to-tetragonal phase transition in Pr2−xNdxNiO4+δ under controlled oxygen partial pressures

2020 ◽  
Vol 49 (34) ◽  
pp. 11931-11941
Author(s):  
Eiki Niwa ◽  
Tsubasa Sato ◽  
Takuya Hashimoto
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Tetragonal Phase ◽  
Structural Phase ◽  
Entropy Change ◽  
Enthalpy Change ◽  
Standard Entropy ◽  
Partial Pressures ◽  
Tetragonal Phase Transition

The standard entropy change, ΔS°, and enthalpy change, ΔH°, at the structural phase transition of Pr2−xNdxNiO4+δ and their impact on variation of phase transition temperature by Nd content.

Increased cubic–tetragonal phase transition temperature and resistivity hysteresis of surface vacuum annealed SrTiO3

2011 ◽  
Vol 105 (1) ◽  
pp. 103-109 ◽  
Author(s):  
Tina Nestler ◽  
Kay Potzger ◽  
Hartmut Stöcker ◽  
Barbara Abendroth ◽  
Ralph Strohmeyer ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Tetragonal Phase ◽  
Tetragonal Phase Transition

scholarly journals The growth status of relaxor-based ferroelectric crystals and their development trends

2014 ◽  
Vol 04 (01) ◽  
pp. 1450002
Author(s):  
Guisheng Xu ◽  
Danfeng Yang ◽  
Jinfeng Liu ◽  
Ying Liu ◽  
Xiaxia Chen
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Tetragonal Phase ◽  
Coercive Field ◽  
Growth Efficiency ◽  
Mechanical Quality Factor ◽  
Development Trends ◽  
Ferroelectric Crystals ◽  
Tetragonal Phase Transition

Our progress in the growth of ternary system Pb ( In 1/2 Nb 1/2) O 3– Pb ( Mg 1/3 Nb 2/3) O 3– PbTiO 3 (PIMNT) crystals and reviews on the possible developing trends in the piezoelectric crystals are presented. Large PIMNT crystals with 3 inches in diameter have been grown by using a modified Bridgman method. Meanwhile, Mn -doped PIMNT crystals have also been obtained. PIMNT crystals exhibit Curie temperature Tc ~ 190° C , rhombohedral–tetragonal phase transition temperature T rt > 100° C and coercive field Ec ~ 5.0–7.0 kV/cm on (001) cuts. Meanwhile, higher piezoelectric constant d32 ~ -1500–2200 pC/N , d15 ~ 4000–6000 pC/N and coercive field Ec ~ 7.0–9.0 kV/cm have been achieved on (110) cuts. The development trends of relaxor-based ferroelectric crystals are suggested to grow novel crystals with high rhombohedral–tetragonal phase transition temperature T rt > 150 ~ 160° C and/or high coercive field Ec and mechanical quality factor Qm, to promote growth efficiency of PIMNT crystals and to create new growth methods fitting for the growth of metastable or instable crystals.

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