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Large single crystals of optical quality of bis(guanidinium)zirconium bis(nitrilotriacetate)hydrate have been grown from aqueous solutions. Complete elastic, thermoelastic and piezoelastic tensors have been determined by ultrasonic methods. In addition, the tensor of thermal expansion, refractive indices, dielectric and piezoelectric constants have been studied in the range between 210 K and 330 K. Most physical properties investigated show a strong anisotropy. The piezoelectric constant  d  123  exceeds  d  111  of  α -quartz by a factor of 25. Two higher-order phase transitions appear at about 287 K and 290 K. The intermediate phase exhibits strong anomalies of the temperature and pressure dependence of the propagation velocities of quasi-longitudinal elastic waves having a large component of the displacement vector parallel to [010].

Physical properties and phase transitions of bis(guanidinium)zirconium bis(nitrilotriacetate)hydrate, [C(NH 2 ) 3 ] 2 Zr[N(CH 2 COO) 3 ] 2 · H 2 O