α, β, γ and δMnO 2 were synthesized through simple hydrothermal reaction according to previous researches with some modification 17,28 Potassium permanganate (KMnO 4), hydrated manganese sulfate (MnSO 4 ·H 2 O) and ammonium persulfate ((NH 4) 2 S 2 O 8) were used without further purification The obtained catalysts were calcined at 360°C before all testsStructural phase transformations of the hcp → bcc → fct → fcc → fct (α → β → γ → δ → ε) type in titanium hydrides TiH x experimentally found to occur with increase in the hydrogen concentration x are studied theoretically Free energy phases are statistically calculated, and their concentration dependence is determined Phase transformation temperatures are found fromα Α ἄλφα alfa a β Β βῆτα beta b γ Γ γάμμα gamma g (sonora) δ Δ δέλτα delta d ε Ε ἔ ψιλόν epsilón e (breve) ζ Ζ ζῆτα dseta ds η Η ἦτα eta e (larga) θ Θ θῆτα zeta z ι Ι ἰῶτα iota i κ Κ κάππα kappa k λ Λ λάμβδα lambda l μ Μ μῦ my m ν Ν νῦ ny n ξ Ξ ξῖ xi x
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