H1NMR study of proton motions in thallium-deficientTlH

Abstract

We have studied a thallium-deficient TlH 2 PO 4 ͑TDP͒ sample in the temperature range 130-400 K using 200 MHz 1 H pulsed NMR. The line shape consists of a broad and a sharp line, corresponding to the TDP phase and a thallium-deficient phase, respectively. The rotating frame spin-lattice relaxation was shown to consist of two separate components each corresponding to the two line shape components, and to sensitively reflect the phase transitions and the proton motions.

Extrinsic Proton NMR Studies of Mg(OH)2 and Ca(OH)2

“…Figure 9 shows the pure frequency dependence of the NMR spectrum rather than the magnetic field effect. Measurement at a higher Larmor frequency pro- The temperature-induced 1 H NMR spectra and the two-component spectra have been observed for MgH 2 [3], LiBH 4 [4], NaMgH 3 [5], NaH [6], and the KH 2 PO 4 family [7,8].…”

“…The temperature-induced 1 H NMR spectra and the two-component spectra have been observed for MgH 2 [3], LiBH 4 [4], NaMgH 3 [5], NaH [6], and the KH 2 PO 4 family [7,8].…”

“…Ionic conduction facilitated by lattice defects also causes the narrowing of the NMR spectra [2]. The development of a narrow NMR spectrum superposed with a broad NMR spectrum has been observed for some hydrates [3][4][5][6], hydrogen-bonded compounds [7,8], and nanocrystalline Li compounds [9][10][11]. The broad component is assigned to immobile ions with dipole-dipole couplings on a rigid lattice, while the narrow component is assigned to mobile ions decoupled from the matrix of each material.…”

Rotating-frame nuclear magnetic resonance study of the distinct dynamics of hydrogen donors in ZnO

“…11,12 Elucidation of the trapping process of H i into V O , generally taken to take place in ZnO, and experimental determination of the activation energies remains an important issue. 6,10,13,14 We have employed solid-state 1 H nuclear magnetic resonance (NMR) spectroscopy, which is a most powerful technique to probe molecular motion in solids, [15][16][17][18] to investigate the dynamics of the proton species in ZnO. In particular, the rotating-frame spin-lattice relaxation was employed as a unique tool for probing the ultra-low-frequency dynamics.…”