Heat capacity, thermal expansion and barocaloric effect in fluoride K2TaF7
URI (for links/citations):https://link.springer.com/article/10.1007%2Fs10853-019-03924-8
Flerov, I. N.
Gorev, M. V.
Kartashev, A. V.
Pogorel’Tsev, E. I.
Laptash, N. M.
Институт инженерной физики и радиоэлектроники
Journal Name:Journal of Materials Science
Journal Quartile in Scopus:Q1
Journal Quartile in Web of Science:Q2
Bibliographic Citation:Flerov, I. N. Heat capacity, thermal expansion and barocaloric effect in fluoride K2TaF7 [Текст] / I. N. Flerov, M. V. Gorev, A. V. Kartashev, E. I. Pogorel’Tsev, N. M. Laptash // Journal of Materials Science. — 2019.
The heat capacity and thermal expansion of potassium heptafluorotantalate were studied. The room temperature phase P21=c is stable at least to 4 K. The strong first-order phase transition P21=c Pnma at T0 ¼ 486:2K is accompanied by giant changes in the entropy, DS0 ¼ 22:3 J ðmolKÞ 1; and volume strain, dV0=V ¼ 3:6%. A rather high sensitivity of K2TaF7 to pressure was found, dT0=dp ¼ 220KGPa 1. Significant extensive and intensive barocaloric effects are found at low pressure. The possibility of improving the barocaloric properties is discussed.