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Title: Investigation into the evolution of the structure of K{sub 1-x}Li{sub x}Ta{sub 1-y}Nb{sub y}O{sub 3} single crystals under variations in temperature

Abstract

The evolution of the structure of K{sub 1-x}Li{sub x}Ta{sub 1-y}Nb{sub y}O{sub 3} single crystals with x = 0.001, y = 0.026, and 1900 ppm Cu (KLTN277) and with x = 0.0014 and y = 0.024 (KLTN123), which exhibit an extremely high permittivity (up to 4 x 10{sup 5} in the quasi-static regime for the KLTN277 crystal), is investigated in the range from room temperature to 20 K. It is demonstrated that, upon cooling to the lowest temperatures, both crystals retain their cubic structure, but the lattice parameters pass through a minimum at the temperature of the observed anomalies of the dielectric response ({approx}50 K). In the neutron diffraction pattern of the KLTN123 sample, satellites appear in the vicinity of the (hhh) reflections at temperatures below {approx}50 K. These satellites can be associated with the nucleation of the rhombohedral phase.

Authors:
; ; ; ;  [1];  [2];  [3]; ;  [4];  [5]
  1. Russian Academy of Sciences, Ioffe Physicotechnical Institute (Russian Federation)
  2. Joint Institute for Nuclear Research (Russian Federation)
  3. Jozef Stefan Institute (Slovenia)
  4. University of Tennessee (United States)
  5. Polish Academy of Sciences, Institute of Nuclear Physics (Poland)
Publication Date:
OSTI Identifier:
21090919
Resource Type:
Journal Article
Resource Relation:
Journal Name: Crystallography Reports; Journal Volume: 52; Journal Issue: 3; Other Information: DOI: 10.1134/S1063774507030169; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COOLING; DIELECTRIC MATERIALS; LATTICE PARAMETERS; LITHIUM COMPOUNDS; MONOCRYSTALS; NEUTRON DIFFRACTION; NIOBIUM COMPOUNDS; NUCLEATION; OXIDES; PERMITTIVITY; POTASSIUM COMPOUNDS; TANTALUM COMPOUNDS; TEMPERATURE RANGE 0013-0065 K; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Borisov, S. A., Vakhrushev, S. B., Koroleva, E. Yu., Naberezhnov, A. A., E-mail: alex.nabereznov@mail.ioffe.ru, Syrnikov, P. P., Simkin, V. G., Kutnjak, Z., Egami, T., Dmowski, W., and Piekarz, P.. Investigation into the evolution of the structure of K{sub 1-x}Li{sub x}Ta{sub 1-y}Nb{sub y}O{sub 3} single crystals under variations in temperature. United States: N. p., 2007. Web. doi:10.1134/S1063774507030169.
Borisov, S. A., Vakhrushev, S. B., Koroleva, E. Yu., Naberezhnov, A. A., E-mail: alex.nabereznov@mail.ioffe.ru, Syrnikov, P. P., Simkin, V. G., Kutnjak, Z., Egami, T., Dmowski, W., & Piekarz, P.. Investigation into the evolution of the structure of K{sub 1-x}Li{sub x}Ta{sub 1-y}Nb{sub y}O{sub 3} single crystals under variations in temperature. United States. doi:10.1134/S1063774507030169.
Borisov, S. A., Vakhrushev, S. B., Koroleva, E. Yu., Naberezhnov, A. A., E-mail: alex.nabereznov@mail.ioffe.ru, Syrnikov, P. P., Simkin, V. G., Kutnjak, Z., Egami, T., Dmowski, W., and Piekarz, P.. Tue . "Investigation into the evolution of the structure of K{sub 1-x}Li{sub x}Ta{sub 1-y}Nb{sub y}O{sub 3} single crystals under variations in temperature". United States. doi:10.1134/S1063774507030169.
@article{osti_21090919,
title = {Investigation into the evolution of the structure of K{sub 1-x}Li{sub x}Ta{sub 1-y}Nb{sub y}O{sub 3} single crystals under variations in temperature},
author = {Borisov, S. A. and Vakhrushev, S. B. and Koroleva, E. Yu. and Naberezhnov, A. A., E-mail: alex.nabereznov@mail.ioffe.ru and Syrnikov, P. P. and Simkin, V. G. and Kutnjak, Z. and Egami, T. and Dmowski, W. and Piekarz, P.},
abstractNote = {The evolution of the structure of K{sub 1-x}Li{sub x}Ta{sub 1-y}Nb{sub y}O{sub 3} single crystals with x = 0.001, y = 0.026, and 1900 ppm Cu (KLTN277) and with x = 0.0014 and y = 0.024 (KLTN123), which exhibit an extremely high permittivity (up to 4 x 10{sup 5} in the quasi-static regime for the KLTN277 crystal), is investigated in the range from room temperature to 20 K. It is demonstrated that, upon cooling to the lowest temperatures, both crystals retain their cubic structure, but the lattice parameters pass through a minimum at the temperature of the observed anomalies of the dielectric response ({approx}50 K). In the neutron diffraction pattern of the KLTN123 sample, satellites appear in the vicinity of the (hhh) reflections at temperatures below {approx}50 K. These satellites can be associated with the nucleation of the rhombohedral phase.},
doi = {10.1134/S1063774507030169},
journal = {Crystallography Reports},
number = 3,
volume = 52,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • We present experimental evidence indicating the formation of metastable dipolar gratings in potassium lithium tantalate niobate at the {ital paraelectric phase}. These dipolar gratings result from the formation of local metastable changes in the Curie-Weiss temperature, which, in the presence of an external electric field, induce changes in the low-frequency polarization. The polarization changes create spatially correlated birefringence gratings due to the electro-optic effect. The dipolar gratings are formed in a slow spontaneous process, to compensate for regular photorefractive gratings immediately after the creation of the latter. {copyright} {ital 1997} {ital The American Physical Society}
  • No abstract prepared.
  • The syntheses, structures, and physical properties of several members of a new family of noncentrosymmetric, open-framework, ion-exchangeable phases which have a substantial nonlinear optical response (Nd:YAG 1064 nm) are described. Single-crystal (to 2 mm) hydrothermal synthesis of Na[sub 1/2](H[sub 3]O)[sub 1/2]Nb[sub 2]PO[sub 8] was carried out at 30,000-40,000 psi and 650-700[degrees]C. The structure of Na[sub 1/2](H[sub 3]O)[sub 1/2]Nb[sub 2]PO[sub 8], as determined from single-crystal X-ray data consists of an octahedral (NbO[sub 6])/tetrahedral (PO[sub 4]) framework, connected via Nb-O-P and Nb-O-Nb bonds, with cavities and channels occupied by the Na[sup +] and H[sub 3]O[sup +] cations. Members of the solid solutionmore » K[sub 2/3]Li[sub 1/3]Nb[sub 2[minus]x]Ta[sub x]PO[sub 8] (0 < x < 2) have been synthesized as powders by solid-state methods and are all isomorphous with Na[sub 1/2](H[sub 3]O)[sub 1/2]Nb[sub 2]PO[sub 8]. Various ion-exchange reactions with NH[sub 4][sup +], Rb[sup +], and Ag[sup +] are possible. These materials have been characterized by X-ray powder diffraction, TGA, [sup 31]P MAS NMR spectroscopy, second-harmonic generation measurements, and UV/visible spectroscopy. Crystal data: Na[sub 1/2](H[sub 3]O)[sub 1/2]Nb[sub 2]PO[sub 8], M[sub r] = 364.94, rhombohedral, R32 (No. 155), a = 8.4962 [angstrom], [alpha] = 104.775[degrees], V = 538.77 [angstrom][sup 3], Z = 3, R = 2.88%, R[sub w] = 3.56% for 66 parameters and 743 observations [I > 3[sigma](I)]. 23 refs., 10 figs., 5 tabs.« less
  • No abstract prepared.
  • No abstract prepared.