Chlorine-35 NQR Studies on [(NH₄)_0.01K_0.09]SnCl₆ Mixed Crystals

Abstract

The temperature dependence o f 35C1 N Q R frequencies was measured on the mixed crystal [(N H 4)00|Kp99]2SnCl6. Two phase transitions have been located at 7"cl = 259K and J ' c2 = 252K , which are lower by 3 K than the corresponding transition temperatures o f the pure K2SnCl6 crystal. The DSC experiments showed that the NH^ concentration dependence o f ?c2 almost parallels that o f Tc]. The impurity effect resulting from the inclusion o f a small amount o f N H f1 ions in K2SnCl6 crystals is discussed in relation to the m icroscopic viewpoint o f the phase transitions.

Temperature Dependence Studies of 35Cl NQR Frequencies in Magnesium and Nickel Hexachlorotellurate(IV) Hexahydrates and Nickel Hexachloroiridate(IV) Hexahydrate

“…The crystals were hygroscopic, although they easily lost water of crystallization under a dry atmosphere. Samples prepared using hydrochloric acid with concentrations lower than 2 N showed poorer or no signals [7], NiTeCl 6 • 6 H 2 0 was obtained by the same method. The crystals have a greenish yellow color.…”

Motion of Water Molecules and Hydrogen Bonds in Zinc Hexachlorostannate (IV) Hexahydrate as Studied by 1H NMR and 35Cl NQR

“…The second moments M 2 of the X H NMR absorption spectra were determined by using a JEOL JNM-MW-40S NMR spectrometer operated at 40 MHz. The sample temperatures were estimated to be accurate within ± 1 K. [Zn(H 2 0) 6 ] [SnCl 6 ] was prepared in a similar as in [3,10]. The NQR signal for the Zn salt had not been observed by a cw spectrometer [3].…”