Anomalous dielectric, piezoelectric and elastic properties of orthorhombic nickel zirconium bis(nitrilotriacetate)·8.5 hydrate, NiZr[N(CH₂COO)₃]₂·8.5 H₂O

Autor(en)

Ekkehart Tillmanns, S Haussühl, Eiken Haussühl

Abstrakt

Large single crystals of optical quality of Ni Zr bis(nitrilotriacetate)×8.5 hydrate (space group C2221) were grown from aq. solns. Complete elastic, thermoelastic, and piezoelastic tensors were detd. by ultrasonic methods. In addn., the indexes of refraction, the tensor of thermal expansion, dielec. and piezoelec. consts. were studied. Most phys. properties investigated show a strong anisotropy. E.g. the relative dielec. consts. Epsilon_33 and epsilon_11 have values of 335 and 7, resp. The static piezoelec. const. d312 surmounts 750 pC/N (by more than a factor of 300 larger than d111 of alpha-quartz), whereas d123 remains as low as 4 pC/N. Anomalous features are the sharp bend of the temp. dependence of e33 at »287 K, and, above 280 K the increasing attenuation of transversal ultrasonic waves propagating along [100] with displacement vector parallel to [010] and vice versa. These waves are related to the elastic const. c66. The anomalies and the large values of e33 and d312 hint at a higher-order ferroelec. transition.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

Universität zu Köln

Journal

Zeitschrift für Kristallographie - Crystalline Materials

Band

213

Seiten

559-562

Anzahl der Seiten

4

ISSN

2194-4946

DOI

https://doi.org/10.1524/zkri.1998.213.11.559

Publikationsdatum

11-1998

Peer-reviewed

Ja

ÖFOS 2012

105113 Kristallographie, 103009 Festkörperphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/anomalous-dielectric-piezoelectric-and-elastic-properties-of-orthorhombic-nickel-zirconium-bisnitrilotriacetate85-hydrate-nizrnch2coo3285-h2o(71e31c70-aa56-47d2-89f5-7caa7dfbb717).html