Lead-free hybrid ferroelectric material based on formamidine: [NH2CHNH2]3Bi2I9

2019 ◽  
Vol 7 (10) ◽  
pp. 3003-3014 ◽  
Author(s):  
Przemysław Szklarz ◽  
Anna Gągor ◽  
Ryszard Jakubas ◽  
Piotr Zieliński ◽  
Anna Piecha-Bisiorek ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Room Temperature ◽  
Ferroelectric Material ◽  
Lead Free ◽  
Ferroelectric Crystals ◽  
Complex Sequences

Novel room-temperature ferroelectric crystals with complex sequences of phase transitions.

[NH2CHNH2]3Sb2I9: a lead-free and low-toxicity organic–inorganic hybrid ferroelectric based on antimony(iii) as a potential semiconducting absorber

2020 ◽  
Vol 7 (8) ◽  
pp. 1780-1789 ◽  
Author(s):  
Przemysław Szklarz ◽  
Ryszard Jakubas ◽  
Anna Gągor ◽  
Grażyna Bator ◽  
Jakub Cichos ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Room Temperature ◽  
Lead Free ◽  
Ferroelectric Crystal ◽  
Inorganic Hybrid ◽  
Complex Sequence ◽  
Low Toxicity

A novel room-temperature ferroelectric crystal with the complex sequence of phase transitions.

Successive near-room-temperature dielectric phase transitions in a lead-free hybrid perovskite-like compound

2019 ◽  
Vol 6 (1) ◽  
pp. 233-237 ◽  
Author(s):  
Jing Zhang ◽  
Shiguo Han ◽  
Xitao Liu ◽  
Chengmin Ji ◽  
Kewen Tao ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Room Temperature ◽  
Lead Free ◽  
Hybrid Compound ◽  
Inorganic Hybrid ◽  
Dielectric Phase ◽  
Hybrid Perovskite ◽  
Successive Phase

We have reported a lead-free organic–inorganic hybrid compound, (hexamethyleneimine)2BiBr5 (1), which undergoes three successive phase transitions in the vicinity of room temperature.

Near-room-temperature tunable dielectric response induced by dual phase transitions in a lead-free hybrid: (C3H8N)2SbBr5

CrystEngComm ◽  
2019 ◽  
Vol 21 (24) ◽  
pp. 3740-3744 ◽  
Author(s):  
Maofan Li ◽  
Bing Teng ◽  
Shiguo Han ◽  
Tao Yang ◽  
Yaobin Li ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Dielectric Response ◽  
Room Temperature ◽  
Lead Free ◽  
Dual Phase ◽  
Inorganic Hybrid

We report a new lead-free organic–inorganic hybrid that undergoes the dual phase transitions near room temperature.

Electrocaloric properties of lead-free ferroelectric ceramic near room temperature

2021 ◽  
Vol 127 (6) ◽  
Author(s):  
Hend Kacem ◽  
Ah. Dhahri ◽  
Mohamed Amara Gdaiem ◽  
Z. Sassi ◽  
L. Seveyrat ◽  
...  
Keyword(s):  
Room Temperature ◽  
Ferroelectric Ceramic ◽  
Lead Free

scholarly journals High-Pressure Spectroscopy Study of Zn(IO3)2 Using Far-Infrared Synchrotron Radiation

Crystals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 34
Author(s):  
Akun Liang ◽  
Robin Turnbull ◽  
Enrico Bandiello ◽  
Ibraheem Yousef ◽  
Catalin Popescu ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Synchrotron Radiation ◽  
Infrared Radiation ◽  
Room Temperature ◽  
Far Infrared ◽  
Low Pressure ◽  
Pressure Response ◽  
Spectroscopy Study ◽  
Far Infrared Radiation

We report the first high-pressure spectroscopy study on Zn(IO3)2 using synchrotron far-infrared radiation. Spectroscopy was conducted up to pressures of 17 GPa at room temperature. Twenty-five phonons were identified below 600 cm−1 for the initial monoclinic low-pressure polymorph of Zn(IO3)2. The pressure response of the modes with wavenumbers above 150 cm−1 has been characterized, with modes exhibiting non-linear responses and frequency discontinuities that have been proposed to be related to the existence of phase transitions. Analysis of the high-pressure spectra acquired on compression indicates that Zn(IO3)2 undergoes subtle phase transitions around 3 and 8 GPa, followed by a more drastic transition around 13 GPa.

Room-temperature NaI/H2O compression icing: solute–solute interactions

2017 ◽  
Vol 19 (39) ◽  
pp. 26645-26650 ◽  
Author(s):  
Qingxin Zeng ◽  
Chuang Yao ◽  
Kai Wang ◽  
Chang Q. Sun ◽  
Bo Zou
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Bond Energy ◽  
Room Temperature ◽  
Solute Concentration ◽  
Solute Interaction ◽  
Solute Interactions

H–O bond energy governs the PCx for Na/H2O liquid–VI–VII phase transition. Solute concentration affects the path of phase transitions differently with the solute type. Solute–solute interaction lessens the PC2 sensitivity to compression. The PC1 goes along the liquid–VI boundary till the triple phase joint.

Temperature-induced structural phase transitions in RERhSn (RE = Y, Gd-Tm, Lu)

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Simon Engelbert ◽  
Rolf-Dieter Hoffmann ◽  
Jutta Kösters ◽  
Steffen Klenner ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Phase Transitions ◽  
Driving Force ◽  
Room Temperature ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray

Abstract The structures of the equiatomic stannides RERhSn with the smaller rare earth elements Y, Gd-Tm and Lu were reinvestigated on the basis of temperature-dependent single crystal X-ray diffraction data. GdRhSn crystallizes with the aristotype ZrNiAl at 293 and 90 K. For RE = Y, Tb, Ho and Er the HP-CeRuSn type (approximant with space group R3m) is already formed at room temperature, while DyRhSn adopts the HP-CeRuSn type below 280 K. TmRhSn and LuRhSn show incommensurate modulated variants with superspace groups P31m(1/3; 1/3; γ) 000 (No. 157.1.23.1) (γ = 3/8 for TmRhSn and γ = 2/5 for LuRhSn). The driving force for superstructure formation (modulation) is a strengthening of Rh–Sn bonding. The modulation is expressed in a 119Sn Mössbauer spectrum of DyRhSn at 78 K through line broadening.

Enhanced electrocaloric strengths at room temperature in (SrxBa1−x)(Sn0.05Ti0.95)O3 lead-free ceramics

2021 ◽  
Vol 871 ◽  
pp. 159519
Author(s):  
Sheng-Guo Lu ◽  
Xiongwei Lin ◽  
Jiang Li ◽  
Dandan Li ◽  
Yingbang Yao ◽  
...  
Keyword(s):  
Room Temperature ◽  
Lead Free ◽  
Lead Free Ceramics
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