ðə sˌiːˈɛs aɪ stɹˈʌktʃɚ kæn biː stˈeɪbɪlˌaɪzd dˌaʊn tə ɹˈuːm tˈɛmpɹɪtʃɚ baɪ dˈoʊpɪŋ wɪð ˈʌðɚ hˈælaɪdz sˈʌtʃ ɐz ˌɑːɹbˈiː ˈaɪ, sˌiːˈɛs ˈaɪ, kˈaɪ, ˈæɡ ˈaɪ, tˌiːˈɛl bˌiːˈɑːɹ ænd tˌiːˈɛl sˌiːˈɛl.
The CsI structure can be stabilized down to room temperature by doping  with other halides such as RbI, CsI, KI, AgI, TlBr and TlCl.