Temperature dependence of polarization echoes in powder

Autor:	Takashi Kimura, Shokichiro Yoshikawa, Tsuyoshi Motegi
Rok vydání:	1981
Předmět:	Nuclear magnetic resonance Condensed matter physics Chemistry Relaxation process Time constant General Physics and Astronomy Material constants Dielectric Atmospheric temperature range Polarization (waves) Piezoelectricity Sound wave
Zdroj:	Journal of Applied Physics. 52:376-380
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.328504
Popis:	In the temperature range −200 –+40 °C, polarization echo characteristics of Rochelle salt and LiNbO3 powder are measured. Measurements are carried out on the two‐pulse echo and the readout echo, which has a transient relaxation process with time constant T*1. The results are discussed with consideration of the temperature coefficients of the materials. The study suggests a possible relation between the observed echo characteristics and the material constants. It is found that the origins of echo generation in Rochelle salt and LiNbO3 powder are dominantly the dielectricity and the piezoelectricity, respectively. Furthermore, the transient relaxation for the readout echo is considered to originate in a residual mechanical fluctuation induced in the two‐pulse sequence application.
Databáze:	OpenAIRE
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