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This work is devoted to researching a phase transition in bismuth tellurite single crystals using a high-temperature X-ray analysis method. The cell parameter step-wise changes at 805 ◦C are revealed. Starting from the data obtained we can say that the first-type transition takes place in bismuth tellurite.Ця робота присвячена дослiдженню фазового переходу в монокристалах телуриту вiсмуту методом високотемпературного рентгеноструктурного аналiзу. Виявленi стрибкоподiбнi змiни параметрiв комiрки при 805 ◦С. Виходячи з отриманих даних, можна казати, що у телуритi вiсмуту має мiсце фазовий перехiд 1-го роду

X-RAY INVESTIGATIONS OF PHASE TRANSITION IN Bi_2TeO_5 SINGLE CRYSTALS