The CsH volume is measured in dependence on pressure up to 35 kbar. A structural NaCl to CSCI type transition associated with a volume jump of 8.6% is found at a pressure of about 6.5 kbar.The T -P phase diagram of CsH is plotted in the temperature range 200 to 525 K. The high pressure phase a t liquid nitrogen teniperature remains metastable down to atmospheric pressure.The lattice parameter of this phase is a = 3.820 A a t 100eK and atmospheric pressure, the lattice parameter of the initial (NaCI type) phase is a = 6.365 A under the same conditions. I.13~epe~a ~~BA C M M O C T~ o6.be~a rnnpUna ue3m OT DaBneHm no 35 kbar. npti naBneHHu h' CsCl ~~n y u co cKagKoM o 6 % e~a S,6y0. B nmep6ane TenInepaTyp 200 no 525 K nocTpoeHa T-P HuarpaMnfa CsH . Qa3a BbicoKoro namemm n p~ BOTHO OW TeMnepaType MeTacTa6Hnb~a BnnoTb AO P = 1 atm. HapaMeTp peurenia 3~0 f i npki 100 K u aTMoc(IepHoM nasneHnU a = 3,820 A , napaMeTp penreTKn cocyqecmyroqefi c Hefi M C X O A H O~~ (mna NaCI) (Ia3b1 a = 6,365 A. OICOJIO 6,5 kbar 0 6~a p y r n e~ (Ia3OBblfi nepexon C U3MeHeHUeM CTpYKTYpbI OT NaCl THna

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Measurements of the RbH volume in dependence on pressure up to 35 kbar are carried out in the temperature range 290 to 555 K. The bulk modulus of the initial R,bH phase is equal to 136 kbar a t room temperature. A phase transition with a jump of volume of 8.5% is found in RbH at about 17 kbar. The T-P phase diagram of RbH is plotted. The results obtained are in accord with the previously stated idea of the crystzllochemical similarity of alkali hydrides and alkali halides.

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