Many authors often model dust ion acoustic (DIA) waves [1] via theKorteweg-de Vries (KdV) equation. The validity of this description is restricted to somerange of amplitudes (which does not always exist) [2]. Based on the Sagdeev potentialtechnique [3] for arbitrary amplitude solitary waves, new features of the existencedomain of the produced waves are found [4]. Sayed et al. [5] have studied DIA wavein a cold plasma system containing negative and positive ions, yet neglecting thermaleffects, which may change drastically the existence domain of solitary waves [4].
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