Universität zu Köln

Pandey, Chandra Shekhar ORCID: 0000-0002-6578-8842, Schreuer, Juergen ORCID: 0000-0002-8611-6842, Burianek, Manfred and Muehlberg, Manfred (2011). Anomalous elastic behavior of relaxor ferroelectric Ca0.28Ba0.72Nb2O6 single crystals. Phys. Rev. B, 84 (17). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Full sets of elastic constants c(ij) of tetragonal tungsten bronze relaxor ferroelectric Ca0.28Ba0.72Nb2O6 (CBN-28) single crystals are measured above Curie temperature up to 1503 K employing resonant ultrasound spectroscopy. Thermal expansion measurements on as-grown unpoled CBN-28 reveal the existence of a characteristic temperature T* (similar to 800 K) for CBN-28 between the Burns temperature T-b (similar to 1100 K) and the temperature of maximum dielectric permittivity T-m (similar to 600 K). The influence of polar nanoregions (PNRs) on the elastic properties of CBN-28 is studied in detail. The temperature evolution of c(ij) shows pronounced anomalies. All independent elastic constants evolved differently, with temperature reflecting their coupling to different types of the reorientational motion of PNRs through their interaction with acoustic waves. The anisotropy of longitudinal elastic stiffness coefficients and the deviation from Cauchy relations for CBN-28 are also studied, showing the evolution of material anisotropy and the nature of bonding interactions with temperature, respectively.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Pandey, Chandra Shekhar UNSPECIFIED orcid.org/0000-0002-6578-8842 UNSPECIFIED Schreuer, Juergen UNSPECIFIED orcid.org/0000-0002-8611-6842 UNSPECIFIED Burianek, Manfred UNSPECIFIED UNSPECIFIED UNSPECIFIED Muehlberg, Manfred UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-485538
DOI:	10.1103/PhysRevB.84.174102
Journal or Publication Title:	Phys. Rev. B
Volume:	84
Number:	17
Date:	2011
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GLASSY POLARIZATION BEHAVIOR; DIFFUSE PHASE-TRANSITION; X-RAY-DIFFRACTION; GROWTH; SR1-XBAXNB2O6; SR0.75BA0.25NB2O6; RANGE Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48553