ON LONG-RANGE LATTICE PERFECTION IN NATURAL TYPE-1A DIAMOND

被引:14
作者
LANG, AR
KOWALSKI, G
MAKEPEACE, APW
MOORE, M
机构
[1] UNIV BRISTOL,SCH MED,DEPT PHYSIOL,BRISTOL BS8 1TD,AVON,ENGLAND
[2] UNIV LONDON,ROYAL HOLLOWAY & BEDFORD NEW COLL,DEPT PHYS,SURREY TW20 0EX,ENGLAND
来源
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1991年 / 64卷 / 03期
关键词
D O I
10.1080/01418619108204858
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Several methods have been applied to examine the lattice perfection in a natural diamond that was uncommonly low in density of dislocations and other sources of long-range strains, but which belonged to the commonest optical type 1a. Infrared absorption microscopy and cathodoluminescence topography demonstrated an exceptionally uniform distribution of nitrogen impurity content, with a concentration of about 0.1%. Defect-imaging examinations by birefringence, X-ray single-crystal and double-crystal topography (which were facilitated by optically polished surfaces on the specimen) were applied to select the most strain-free volume, which was then probed by synchrotron radiation double-crystal diffractometry. A 220-reflection, symmetrical Laue case rocking curve only about 0.25 arc second wider than that calculated for perfect diamond was recorded. Analysis was expressed in terms of apparent value of epsilon = F(g)"/F0", the ratio of imaginary parts of the structure factor for orders g and 0. The observed profile for g = 220 and wavelength 0.154 nm was well fitted by apparent epsilon = 0.69 (theoretical epsilon = 0.96). Minor asymmetry in the flanks of the experimental profile was explained by the presence of a small component of incoherent scattering in the diffracted beam.
引用
收藏
页码:543 / 560
页数:18
相关论文
共 28 条
[1]  
Authier A., 1978, Diffraction and imaging techniques in material science, vol.II. Imaging and diffraction techniques, 2nd revised edition, P715
[2]   THE DOUBLE CRYSTAL X-RAY-CAMERA AT DARESBURY-LABORATORY [J].
BOWEN, DK ;
DAVIES, ST .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH, 1983, 208 (1-3) :725-729
[3]   THE RELATIONSHIP BETWEEN PLATELET SIZE AND THE FREQUENCY OF THE B' INFRARED-ABSORPTION PEAK IN TYPE-IA DIAMOND [J].
CLACKSON, SG ;
MOORE, M ;
WALMSLEY, JC ;
WOODS, GS .
PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1990, 62 (02) :115-128
[4]  
Davies G, 1977, CHEM PHYS CARBON, V13, P2
[5]   COVALENT BOND IN DIAMOND [J].
DAWSON, B .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1967, 298 (1454) :264-&
[6]   BOUND EXCITONS AND DONOR-ACCEPTOR PAIRS IN NATURAL AND SYNTHETIC DIAMOND [J].
DEAN, PJ .
PHYSICAL REVIEW, 1965, 139 (2A) :A588-&
[7]  
FRIEDEL G, 1924, B SOC FRANC MINERAL, V47, P60
[8]  
Hanley P. L., 1977, PHIL T R SOC A, V284, P329, DOI DOI 10.1098/RSTA.1977.0012
[9]  
HILDEBRANDT G, 1975, Z NATURFORSCH A, V30, P697
[10]   INTENSITY OF X-RAY REFLEXION FROM PERFECT AND MOSAIC ABSORBING CRYSTALS [J].
HIRSCH, PB ;
RAMACHANDRAN, GN .
ACTA CRYSTALLOGRAPHICA, 1950, 3 (03) :187-194