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Na Nuclear Spin-Lattice Relaxation in Dehydrated Zeolite NaY*

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Na Nuclear Spin-Lattice Relaxation in Dehydrated Zeolite NaY*

Mutsuo Igarashi

a

, Noriaki Okubo

b

, and Ryozo Yoshizaki

c

aDepartment of Applied Physics, Gunma College of Technology, Maebashi 371, Japan

bInstitute of Physics, University of Tsukuba, Tsukuba 305, Japan

cInstitute of Applied Physics, University of Tsukuba, Tsukuba 305, Japan

Z. Naturforsch. 53 a, 442–446 (1998); received December 30, 1997

The spin-lattice relaxation timeT1of23Na-NMR in dehydrated zeolite NaY has been measured from 26 to 300 K. The magnetization recovery curve is not single-exponential at all measured temperatures andT1 1increases in proportion to the square of temperature above 200 K. The result is analyzed with a theory of the Raman process based on covalency. The value ofT1is compared with that of NaX in which the concentration of Na is about 2 times larger than in NaY.

Key words: Dehydrated Zeolite NaY;23Na-NMR;T1; Raman Process; Phonon Spectrum.

Reprint requests to Dr. M. Igarashi; Fax: +81-27-254-9022, E-mail: igarashi@nat.gunma-ct.ac.jp

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