Effect of stoichiometry on the thermal expansion coefficients of lithium niobate single crystals

被引：8
作者：
Singh, K [1 ]
Saodekar, PV
Bhoga, SS
机构：
[1] Amravati Univ, Dept Phys, Amravati 444602, India
[2] Jagadamba Mahavidyalaya, Dept Phys, Achalpur 444806, India
[3] Hislop Coll, Dept Phys, Nagpur 440001, Maharashtra, India
来源：
BULLETIN OF MATERIALS SCIENCE | 1998年 / 21卷 / 06期
关键词：
single crystal; thermal expansion; non-stoichiometry; defects; octahedra;
D O I：
10.1007/BF02790348
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The chemical analysis of LiNbO3 single crystals, with different melt compositions (Li/Nb)(m) = 0.945, 1.0, 1.1 and 1.2, grown by slow cooling technique, reveals a remarkable difference in solid and melt compositions, The thermal expansion coefficients along a and c axes, determined by using Newton's ring experiment, are found to increase anisotropically with increase in (Li/Nb), ratio. The variation in thermal expansion coefficient with increase in the (Li/Nb)nl ratio is discussed in the light of defect chemistry i.e. the partial replacement of Li+ by excess Nb5+ creates additional cation vacancies to attain the electro-neutrality in the crystal.
引用
收藏
页码：469 / 474
页数：6
相关论文
共 29 条
[11]   THERMAL EXPANSION OF LITHIUM TANTALATE AND LITHIUM NIOBATE SINGLE CRYSTALS [J].
KIM, YS ;
SMITH, RT .
JOURNAL OF APPLIED PHYSICS, 1969, 40 (11) :4637-&
[12]  
LEMER P, 1968, J CRYST GROWTH, V3, P6503
[13]  
LOVELL M, 1979, PHYSICAL PROPERTIES, P115
[14]   THERMAL EXPANSION OF INTERATOMIC BONDS ILLUSTRATED BY EXPERIMENTAL EVIDENCE FROM CERTAIN NIOBATES [J].
MEGAW, HD .
ACTA CRYSTALLOGRAPHICA SECTION A-CRYSTAL PHYSICS DIFFRACTION THEORETICAL AND GENERAL CRYSTALLOGRAPHY, 1968, A 24 :589-+
[15]   STACKING-FAULT MODEL FOR STOICHIOMETRY DEVIATIONS IN LINBO3 AND LITAO3 AND EFFECT ON CURIE TEMPERATURE [J].
NASSAU, K ;
LINES, ME .
JOURNAL OF APPLIED PHYSICS, 1970, 41 (02) :533-&
[16]   FERROELECTRIC LITHIUM NIOBATE .1. GROWTH DOMAIN STRUCTURE DISLOCATIONS AND ETCHING [J].
NASSAU, K ;
LEVINSTEIN, HJ ;
LOIACONO, GM .
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1966, 27 (6-7) :983-+
[17]   DIELECTRIC PROPERTIES OF LINBO3 SINGLE CRYSTAL UP TO 9 GC [J].
OHMACHI, Y ;
SAWAMOTO, K ;
TOYODA, H .
JAPANESE JOURNAL OF APPLIED PHYSICS, 1967, 6 (12) :1467-&
[18]   NB-93 NMR LINEWIDTHS IN NONSTOICHIOMETRIC LITHIUM-NIOBATE [J].
PETERSON, GE ;
CARNEVALE, A .
JOURNAL OF CHEMICAL PHYSICS, 1972, 56 (10) :4848-+
[19]   GROWTH, STOICHIOMETRY AND PROPERTIES OF LINBO3 SINGLE-CRYSTALS [J].
POLGAR, K ;
JESZENSZKY, L ;
RAKSANYI, K ;
HARTMANN, E .
ACTA PHYSICA ACADEMIAE SCIENTIARUM HUNGARICAE, 1979, 47 (1-3) :125-132
[20]  
RAUBER A, 1978, CHEM PHYS LITHIUM NI
123