High-temperature phenomena in RbD2PO4 and CsH2PO4 . Polymeric transformations or polymorphic phase transitions?

• Autorzy: Bronowska W.
• Konferencja: IX National Conference on Fast Ion Conductors , Wrocław-Borowice , 9-12 December 2004
• Języki publikacji: EN

Abstrakty

EN

X-ray analysis has been performed for RbD2PO4 and CsH2PO4 over the temperature range from 288 K to 537 K and 507 K, respectively. The refinement of the crystal structure of RbD2PO4 at 430 K has revealed that the high-temperature paraelectric phase of this crystal is isomorphic with the monoclinic P21/m paraelectric phase of CsH2PO4. The X-ray diffraction CCD images obtained for RbD2PO4 have proved that the high-temperature paraelectric phase is stable up to approximately 525 K. At this temperature, polycrystallisation of the single-crystal samples and their subsequent decomposition has been observed. CsH2PO4 undergoes a structural phase transition at 504 K, from the monoclinic paraelectric phase to a cubic superionic phase (P21/m transforms to Pm-3m symmetry). The reversibility of the superionic phase transition in the crystals is a strong evidence for a polymorphic character of this solid-solid transition.

Słowa kluczowe

EN

X-ray analysis; crystal structure; phase transition; polymorphic transformation

PL

analiza rentgenowska; struktura kryształu; przejścia fazowe; przemiana fazowa; transformacja polimorficzna

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2006
• Tom: Vol. 24, No. 1
• Strony: 229--236
• Opis fizyczny: Bibliogr. 22 poz.

Twórcy

autor

Bronowska W.

• Institute of Physics, Wroclaw University of Technology, Wybrzeże Wyspiańskiego 27, Wrocław,

Bibliografia

• [1] BLINC R., O’REILLY D.E., PETERSON E.M., WILLIAMS M., J. Chem. Phys., 50 (1969), 5408.
• [2] KOMUKAE M., KAWASHIMA K. OSAKA T., J. Phys. Soc. Jpn., 69 (2000), 2076.
• [3] MATTAUCH S., PAULUS W., GLINNEMANN J., HEGER G., Physica B, 234–236 (1997), 40.
• [4] SUMITA M., OSAKA T., MAKITA Y., J. Phys. Soc. Jpn., 50 (1981), 154.
• [5] BRONOWSKA W., PIETRASZKO A., Solid State Commun., 76 (1990), 293.
• [6] PRAISINGER A., MEREITER K., BRONOWSKA W., Mat. Sci. Forum, 166–169 (1994), 511.
• [7] BRONOWSKA W., Adv. X-Ray Anal., 40 (1998), CD.
• [8] BRONOWSKA W., J. Chem. Phys., 114 (2001), 611.
• [9] SUZUKI S., ARAI K., SUMITA M., MAKITA Y., J. Phys. Soc. Jpn., 52 (1983), 2394.
• [10] HAGIWARA T., ITOH K., NAKAMURA E., KOMUKAE M., MAKITA Y., Acta Cryst.C, 40 (1984), 718.
• [11] OSAKA T., SUMITA M., MAKITA Y., J. Phys. Soc. Jpn., 52 (1983), 1124.
• [12] MAKITA Y., SUMITA M., OSAKA T., SUZUKI S., Ferroelectrics, 39 (1981), 1017.
• [13] LEVSTIK A., BLINC R., KADABA P., CIZIKOV S., LEVSTIK I., FILIPIC C., Solid State Commun., 16 (1975), 1339.
• [14] UESU Y., KOBAYASHI J., Phys. Status Solidi (a), 34 (1976), M 475.
• [15] BARANOV A.I., KHIZNICHENKO V.P., SHUVALOV L.A., Ferroelectrics, 100 (1989), 135.
• [16] ORTIZ E., VARGAS R.A., MELLANDER B.-E., J. Chem. Phys., 110 (1999), 4847.
• [17] HAILE S.M., Mater. Res. Soc. Symp. Proc., 547 (1999), 315.
• [18] BOYSEN D.A., HAILE S.M., LIU H., SECCO R.A., Chem. Mater., 15 (2003), 727.
• [19] LEE K.-S., J. Phys. Chem. Solids, 57 (1996), 333.
• [20] PARK J.H., Phys. Rev. B, 69 (2004), 054104.
• [21] OTOMO J., Solid State Ionics, 156 (2003), 357.
• [22] SHELDRICK G.M., SHELXL-97, Programs for the Solution and the Refinement of the Crystal Structure from Diffraction Data, University of Gottingen, 1997.