Internal friction and dielectric loss related to domain walls

Elastic and anelastic anomalies in (Ca,Sr)TiO3 perovskites: Analogue behaviour for silicate perovskites

“…In general, the magnitude of anelastic softening due to twin wall movements under applied stresses depends largely on the restoring force they experience when they become M a n u s c r i p t 14 displaced from their stress-free configurations, while the magnitude of dissipation depends largely on viscous drag as they move (Combs and Yip, 1983;Huang et al, 1992;Harrison and Redfern, 2002;Harrison et al, 2003Harrison et al, , 2004. Between T1 and the freezing interval, tetragonal crystals are most likely to be in the domain wall sliding regime of Natterman et al…”

Acoustic attenuation due to transformation twins in CaCl2: Analogue behaviour for stishovite

“…In the interval where there are no data for Q À1 due to the strong attenuation, a plateau of attenuation would be expected, by analogy with the dissipation behaviour of both acoustic and dielectric properties at ferroelectric transitions, which is attributed to viscous movement of twin walls. The viscous drag may be understood in terms to the disruption of phonons behind the moving walls (Combs and Yip, 1983;Huang et al, 1992;Wang et al, 1996;Harrison et al, 2004a). At lower temperatures, the improved resolution of the low temperature RUS head reveals the presence of broad RUS peaks with a tendency for Q À1 to reduce with falling temperature, corresponding to the lower temperature part of the expected plateau region.…”

30 MHz ultrasonic attenuation of TiNi single crystal associated with B2-B19' martensitic transformation and twin boundaries

“…The frequency is limited mostly to 100Hz. Recent study [4] on kilohertz range revealed some new interesting features: even the damping peak associated with the transformation is frequency dependent.…”

“…Compared with usual metals and alloys, martensitic alloys exhibit extraordinary high damping capacity (about two order of magnitude higher) in transformation temperature region and in martensitic state. This high damping capacity is generally regarded as due to the motion of martensite/parent phase interface and due to the motion of martensite domain walls (twin boundaries) [1][2][3][4]. Such a process dissipates mechanical energy and generates a high damping capacity.…”

“…The frequency is limited mostly to 100Hz. Recent study [4] on kilohertz range revealed some new interesting features: even the damping peak associated with the transformation is frequency dependent.Another unclear issue is the origin of the broad damping peak in martensitic state. The martensite damping peak has been reported in various ferroelastic/martensitic materials, such as TiNi [6,7], AuCd [8], LNPP [9], etc.…”