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Citation: Luo Shi-Min, Wang Shi-Hua. Mechanism of CsTmI₃ Formation and Its Phase-Transition Temperature[J]. Acta Physico-Chimica Sinica, ;1990, 6(01): 91-94. doi: 10.3866/PKU.WHXB19900116 shu

Mechanism of CsTmI₃ Formation and Its Phase-Transition Temperature

1.
Department of Chemistry,Beijing Normal University

Received Date: 12 April 1988
Available Online: 15 February 1990

With an attempt to improve our proposed one-step method for direct synthesis of CsTmI_3 from CsI:HgI_2:Tm (molar ratio 1: 1: 1) mixture, we have investigated the mechanism of CsTmI_3 formation under this condition by using DTA and X-ray powder diffraction methods. The results obtained indicate that there are two pathways leading to formation of CsTmI_3 from this mixture:The first one involves the reaction between HgI_2 and Tm at 314 ℃ with formation of TmI_2, which, in turn, acts as an interme-diate for CsTmI_3 formation is intermediated by CsHgI_3 (a new phase) formed from CsI and HgI_2 at 210 ℃ and this intermediate will convert to the final product CsTmI_3 in the presence of Tm at 530 ℃.
In addition, we have also studied the phase transition of CsTmI_3. It is found that there are three reversible endo-thermal peaks appeared at 510 ℃, 648 ℃ and 665 ℃ in DTA curve. The X-ray analysis indicated that the peak at 510 ℃ could be assigned at the phase transition of CsTmI_3 and the peak at 665 ℃ is responsible for its melting point. The peak at 648 ℃ seems most likely to be another phase transtion.
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Mechanism of CsTmI₃ Formation and Its Phase-Transition Temperature