The Observation of Incipient Phase Transitions in K2PtCl6, K2PdCl6, and K2IrCl6

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Abstract
Measurements of the temperature dependence of the nuclear quadrupole resonance (NQR) frequencies and spin–lattice relaxation times for the 35Cl nuclei in Cs2PtCl6, Rb2PtCl6, K2PtCl6, and K2PdCl6 provide information on the temperature dependence of two averages of the rotary lattice mode frequency over the-Brillouin zone. An iterative method is introduced to analyze the NQR frequency data and simultaneously yield the static lattice resonance frequencies and the temperature dependence of one of the average rotary mode frequencies. The results show that previous analyses of the data yielded erroneous values of the static lattice resonance frequencies. What is more interesting, the analysis presented clearly indicates incipient phase transitions in both K2PtCl6 and K2PdCl6 but shows that the structures of Cs2PtCl6 and Rb2PtCl6 remain stable to 0 K. The interpretation of the relaxation time data yields the temperature dependence of the second average rotary mode frequency and substantiates the conclusions drawn from the frequency data. A comparison of data for K2PtCl6 and K2IrCl6 reveals an incipient phase transition in the latter substance as well.

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