کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5373546 | 1504223 | 2014 | 7 صفحه PDF | دانلود رایگان |
- The new hybrid, organic-inorganic crystal [(CH3)3C5H2NH][ClO4] was studied.
- The piezoelectric properties were determined.
- One of the piezoelectric module at phase transition point at 226Â K drops to the value twice smaller than in RT.
- The SHG properties were studied.
- The phase diagram was determined.
[(CH3)3C5H2NH][ClO4] exhibits rich polymorphism, it undergoes four structural phase transitions: from phases I to II at 356/327Â K (heating/cooling), II-III at 346/326, III-IV at 226Â K and IV-V at 182/170Â K. [(CH3)3C5H2NH][ClO4] reveals a strong optical nonlinearity over a wide temperature region with the SHG efficiency comparable to that of KDP. The piezoelectric properties were studied macroscopically by series resonance method over the phases III, IV and V as well as microscopically by means of piezoelectric force microscopy (PFM) in ambient conditions. One of the piezoelectric module at phase transition point at 226Â K drops to the value twice smaller than in room temperature what up to now was not encountered in literature. Moreover the ferroelastic phase transition IV-V was observed by means of polarizing optical microscope. The choice of the point group of phase I (Pmmm) was confirmed by the SHG measurements. The updated phase diagram is presented.
Journal: Chemical Physics - Volume 441, 30 September 2014, Pages 59-65