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Nuclear magnetic resonance in superionic conductors with fluorite-type structure; Ressonancia magnetica nuclear em condutores superionicos de estrutura fluorita

Miscellaneous:

Abstract

The {sup 19} F NMR relaxation times T{sub 1} and T{sub 2} were measured in ternary and nonstoichiometric compounds with the fluorite-type structure. We have studied the Na{sub 0-4} Y{sub 0-6} F{sub 2-2} crystal in the temperature range 600 K to 900 K, where the crystal has not the fluorite structure. The T{sub 1} values were measured in 2 Larmor frequencies: 20.42 MHz and 34.24 MHz. The results for T{sub 1} were seem to be qualitatively similar to those measured in the system with two inequivalent sublattices. The T{sub 2} measurements, in the Pb{sub O84} Bi{sub 0-16} F{sub 2-16} crystal, were made during temperature cycles in the range of 300 K to 830 K. The difference in activation energy between cooling and heating half cycles, found to be approximately 0.08 eV, appear to be associated with the change in the clusters structure and not to the energy of defect formation. Finally, similar T{sub 2} measurements during temperature cycling was made in K{sub 0-4} Bi{sub 0-6} F{sub 2-2} : 2% Pb F{sub 2} crystal, in the temperature range 300 K to 800 K, but in this case no difference in the cooling and heating results was observed. We also measured, in  More>>
Publication Date:
Dec 31, 1990
Product Type:
Miscellaneous
Reference Number:
SCA: 665100; PA: AIX-27:049927; EDB-96:102580; SN: 96001612817
Resource Relation:
Other Information: TH: Tese (M.Sc.).; PBD: 1990
Subject:
66 PHYSICS; NUCLEAR MAGNETIC RESONANCE; FLUORITE; IONIC CONDUCTIVITY; SPIN-LATTICE RELAXATION; STRUCTURAL CHEMICAL ANALYSIS
OSTI ID:
246152
Research Organizations:
Sao Paulo Univ., Sao Carlos, SP (Brazil). Inst. de Fisica e Quimica
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
TRN: BR9635001049927
Availability:
Available from the Nuclear Information Center of Brazilian Nuclear Energy Commission, Rio de Janeiro
Submitting Site:
BRN
Size:
135 p.
Announcement Date:

Miscellaneous:

Citation Formats

Souto, Sergio Paulo Amaral. Nuclear magnetic resonance in superionic conductors with fluorite-type structure; Ressonancia magnetica nuclear em condutores superionicos de estrutura fluorita. Brazil: N. p., 1990. Web.
Souto, Sergio Paulo Amaral. Nuclear magnetic resonance in superionic conductors with fluorite-type structure; Ressonancia magnetica nuclear em condutores superionicos de estrutura fluorita. Brazil.
Souto, Sergio Paulo Amaral. 1990. "Nuclear magnetic resonance in superionic conductors with fluorite-type structure; Ressonancia magnetica nuclear em condutores superionicos de estrutura fluorita." Brazil.
@misc{etde_246152,
title = {Nuclear magnetic resonance in superionic conductors with fluorite-type structure; Ressonancia magnetica nuclear em condutores superionicos de estrutura fluorita}
author = {Souto, Sergio Paulo Amaral}
abstractNote = {The {sup 19} F NMR relaxation times T{sub 1} and T{sub 2} were measured in ternary and nonstoichiometric compounds with the fluorite-type structure. We have studied the Na{sub 0-4} Y{sub 0-6} F{sub 2-2} crystal in the temperature range 600 K to 900 K, where the crystal has not the fluorite structure. The T{sub 1} values were measured in 2 Larmor frequencies: 20.42 MHz and 34.24 MHz. The results for T{sub 1} were seem to be qualitatively similar to those measured in the system with two inequivalent sublattices. The T{sub 2} measurements, in the Pb{sub O84} Bi{sub 0-16} F{sub 2-16} crystal, were made during temperature cycles in the range of 300 K to 830 K. The difference in activation energy between cooling and heating half cycles, found to be approximately 0.08 eV, appear to be associated with the change in the clusters structure and not to the energy of defect formation. Finally, similar T{sub 2} measurements during temperature cycling was made in K{sub 0-4} Bi{sub 0-6} F{sub 2-2} : 2% Pb F{sub 2} crystal, in the temperature range 300 K to 800 K, but in this case no difference in the cooling and heating results was observed. We also measured, in the same temperature range, the T{sub 1} relaxation time in 3 Larmor frequencies: 11.71 MHz, 20.42 MHz and 34.24 Mhz. This results appear to indicate the existence of two hopping mechanism. (author). 132 refs., 68 figs.}
place = {Brazil}
year = {1990}
month = {Dec}
}