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The solid sphere ion model is used to compare specific volumes of NaCl and CsCl phases of alkali hydrides. The transition of the KoCl to CsCl type is shown to be thermodynamically possible in K, Rb, and Cs hydrides. A phase transition is detected in K H a t pressures about 40 kbar, and the T-P diagram of K H is studied. On the basis of the analysis performed, the NaCl to CsCl transition in LiH is unlikely, unless the electron configurations of the ions are changed. B npH6JIHWeHHH WeCTKHX C@ep IIpOBeHeHO CpaBHeHIIe YneJIbHbIX 06' beMOB NaCl II CSCl MOaH@HKZU&i rHDpHnOB ILIeJIOYHbIX MeTaJIJIOB. nOKa3aH0, 9TO B rHHpHJIaX I<, Rb H C S non EasneHneM TepMoipiHa;nHrecmi B O~M O S~C~H nepexon m n a NaCI-CsCI. IIpn nasneHam OKOJIO 40 kbar 0 6~a p y m e~ nepexoa H HccnenoBaHa IT-P HHarpaMMa rxnpmna KanHfi. Ha ocHoBaHm nponenaHHoro a~a n m a Pu' aC1-CsC1 nepexon B LiH npencTaBnfieTcfi Mano-BepOfiTHbIM, eCjIH IIpH IIepeXORe He H3MeHHTCJl3JIeHTpOHHafi €iOH@lHfypallHH HOHOB.

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