These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.
Pubmed for Handhelds
PUBMED FOR HANDHELDS
Search MEDLINE/PubMed
Title: Structural stability of BaMF4 (M = Mg, Zn and Mn) at high pressures. Author: Posse JM, Friese K, Grzechnik A. Journal: J Phys Condens Matter; 2011 Jun 01; 23(21):215401. PubMed ID: 21555837. Abstract: Piezoelectric fluorides of the composition BaMF(4) (M = Mg, Zn, Mn) have been studied in situ at high pressures in diamond anvil cells with single-crystal x-ray diffraction and Raman spectroscopy. All three compounds crystallize in the acentric space group Cmc 2(1) at ambient pressure. BaMgF(4) undergoes a reversible second order phase transition to the paraelectric phase (space group Cmcm) at pressures between 5 and 6 GPa. BaZnF(4) undergoes a reversible first order phase transition to a monoclinic phase (space group P 11n). Both high- and low-pressure polymorphs coexist in the pressure range 5-7 GPa. BaMnF(4) maintains the Cmc 2(1) structure up to pressures of 4 GPa. Above this pressure the diffraction signal decreases rapidly and at 6 GPa no diffraction signal could be detected in our experiment. The compound does not recover its crystallinity on decompression. A comparison of the effects of external and chemical pressure is presented.[Abstract] [Full Text] [Related] [New Search]