Mesoscopic structures in ferroelastic crystals: Needle twins and right-angled domains

被引:76
作者
Salje, EKH
Ishibashi, Y
机构
[1] UNIV CAMBRIDGE, INTERDISCIPLINARY RES CTR, CAMBRIDGE CB2 3EQ, ENGLAND
[2] NAGOYA UNIV, SCH ENGN, DEPT APPL PHYS, CHIKUSA KU, NAGOYA, AICHI 46401, JAPAN
关键词
D O I
10.1088/0953-8984/8/44/004
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The shape and orientation of twin walls are calculated within the limits of elasticity theory. Single twin walls are oriented along lattice planes which are determined by the condition that the variation in the spontaneous strain through the twin walls does nor generate secondary strain fields. The twin walls have a finite thickness which is described by the Landau-Ginzburg theory. Two twin walls can bend towards each other and form a wedge-shaped junction. The trajectories of the twin walls in the plane perpendicular to the junction are needle shaped so that domains enclosed by the twin walls are commonly called 'needle domains'. It is shown that the actual shape of the trajectory varies widely between straight lines (i.e. planar walls near the junction) to parabolic or exponential (i.e. curved twin walls near the junction which make the needle tip appear blunt). The essential physical parameters which determine the shape of the trajectory are, firstly, the energies to bend a wall segment, secondly, the energy required to rotate a planar wall segment in an elastically anisotropic medium and, thirdly, the Peierls energy which is required to move a walls segment laterally. Various characteristic trajectories are discussed including those of junctions between orthogonal walls.
引用
收藏
页码:8477 / 8495
页数:19
相关论文
共 46 条
[21]   THE RELATIONSHIP BETWEEN THE TWIN STRUCTURE AND OPTICAL DOMAINS IN SINGLE-CRYSTAL YBA2CU3O7-DELTA [J].
NOURUZIKHORASANI, A ;
TAYLOR, KNR ;
BOSI, S .
JOURNAL OF CRYSTAL GROWTH, 1989, 98 (03) :461-468
[22]   ANNEALING OF TWEED MICROSTRUCTURE IN HIGH-TC SUPERCONDUCTORS STUDIED BY A COMPUTER-SIMULATION [J].
PARLINSKI, K ;
SALJE, EKH ;
HEINE, V .
ACTA METALLURGICA ET MATERIALIA, 1993, 41 (03) :839-847
[23]   ORIGIN OF TWEED TEXTURE IN THE SIMULATION OF A CUPRATE SUPERCONDUCTOR [J].
PARLINSKI, K ;
HEINE, V ;
SALJE, EKH .
JOURNAL OF PHYSICS-CONDENSED MATTER, 1993, 5 (04) :497-518
[24]   TWEED MICROSTRUCTURES - EXPERIMENTAL-OBSERVATIONS AND SOME THEORETICAL-MODELS [J].
PUTNIS, A ;
SALJE, E .
PHASE TRANSITIONS, 1994, 48 (1-3) :85-105
[25]   ROLE OF MICROTWINS IN TWIN LAMELLA INTERSECTIONS AND INTERCONNECTIONS IN YBA2CU3O7-Y [J].
ROSOVA, A ;
BOULESTEIX, C ;
VAVRA, I .
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1993, 214 (3-4) :247-256
[26]   MICROSTRUCTURES IN HIGH-TC SUPERCONDUCTORS [J].
SALJE, E ;
PARLINSKI, K .
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 1991, 4 (03) :93-97
[27]   PHASE-TRANSITIONS IN PB3(P1-XASXO4)2 - INFLUENCE OF THE CENTRAL PEAK AND FLIP MODE ON THE RAMAN-SCATTERING OF HARD MODES [J].
SALJE, E ;
DEVARAJAN, V ;
BISMAYER, U ;
GUIMARAES, DMC .
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1983, 16 (27) :5233-5243
[28]  
Salje E., 1993, PHASE TRANSITIONS FE, V3rd
[29]   ON THE KINETICS OF PARTIALLY CONSERVED ORDER PARAMETERS - A POSSIBLE MECHANISM FOR PATTERN-FORMATION [J].
SALJE, EKH .
JOURNAL OF PHYSICS-CONDENSED MATTER, 1993, 5 (27) :4775-4784
[30]   Novel 7-circle diffractometer for the rapid analysis of extended defects in thin films, single crystals and ceramics [J].
Salje, EKH .
PHASE TRANSITIONS, 1995, 55 (1-4) :37-&