Structure stability of confined bismuth sesquioxide phases - low- temperature experimental and computational studies

M Nowagiel and JE Garbarczyk and M Wasiucionek and P Keblinski and TK Pietrzak, APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 130, 890 (2024).

DOI: 10.1007/s00339-024-07991-w

Several bismuth sesquioxide (Bi2\documentclass12ptminimal \usepackageamsmath \usepackagewasysym \usepackageamsfonts \usepackageamssymb \usepackageamsbsy \usepackagemathrsfs \usepackageupgreek \setlength\oddsidemargin-69pt \begindocument$$_2$$\enddocumentO3\documentclass12ptminimal \usepackageamsmath \usepackagewasysym \usepackageamsfonts \usepackageamssymb \usepackageamsbsy \usepackagemathrsfs \usepackageupgreek \setlength\oddsidemargin-69pt \begindocument$$_3$$\enddocument) phases (namely beta\documentclass12ptminimal \usepackageamsmath \usepackagewasysym \usepackageamsfonts \usepackageamssymb \usepackageamsbsy \usepackagemathrsfs \usepackageupgreek \setlength\oddsidemargin-69pt \begindocument$$\upbeta$$\enddocument, gamma\documentclass12ptminimal \usepackageamsmath \usepackagewasysym \usepackageamsfonts \usepackageamssymb \usepackageamsbsy \usepackagemathrsfs \usepackageupgreek \setlength\oddsidemargin-69pt \begindocument$$\upgamma$$\enddocument and delta\documentclass12ptminimal \usepackageamsmath \usepackagewasysym \usepackageamsfonts \usepackageamssymb \usepackageamsbsy \usepackagemathrsfs \usepackageupgreek \setlength\oddsidemargin-69pt \begindocument$$\updelta$$\enddocument-like) were previously stabilized at room temperature by nanocrystallization of bismuthate glasses. Normally, a monoclinic alpha\documentclass12ptminimal \usepackageamsmath \usepackagewasysym \usepackageamsfonts \usepackageamssymb \usepackageamsbsy \usepackagemathrsfs \usepackageupgreek \setlength\oddsidemargin-69pt \begindocument$$\upalpha$$\enddocument phase is the stable one at ambient conditions in polycrystalline materials. In this work, we wanted to observe if any phase transitions would occur below the room temperature for beta\documentclass12ptminimal \usepackageamsmath \usepackagewasysym \usepackageamsfonts \usepackageamssymb \usepackageamsbsy \usepackagemathrsfs \usepackageupgreek \setlength\oddsidemargin-69pt \begindocument$$\upbeta$$\enddocument, gamma\documentclass12ptminimal \usepackageamsmath \usepackagewasysym \usepackageamsfonts \usepackageamssymb \usepackageamsbsy \usepackagemathrsfs \usepackageupgreek \setlength\oddsidemargin-69pt \begindocument$$\upgamma$$\enddocument and delta\documentclass12ptminimal \usepackageamsmath \usepackagewasysym \usepackageamsfonts \usepackageamssymb \usepackageamsbsy \usepackagemathrsfs \usepackageupgreek \setlength\oddsidemargin-69pt \begindocument$$\updelta$$\enddocument-like phases confined in a residual glassy matrix. Observations were made down to 100 K using X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). Both experimental techniques showed no traces of phase transition upon cooling to the temperature limit of our equipment. From XRD studies, the lattice parameter of the delta-like phase was determined. The values were compared to the values calculated by molecular dynamics studies of overcooled delta\documentclass12ptminimal \usepackageamsmath \usepackagewasysym \usepackageamsfonts \usepackageamssymb \usepackageamsbsy \usepackagemathrsfs \usepackageupgreek \setlength\oddsidemargin-69pt \begindocument$$\updelta$$\enddocum ent-Bi2\documentclass12ptminimal \usepackageamsmath \usepackagewasysym \usepackageamsfonts \usepackageamssymb \usepackageamsbsy \usepackagemathrsfs \usepackageupgreek \setlength\oddsidemargin-69pt \begindocument$$_2$$\enddocumentO3\documentclass12ptminimal \usepackageamsmath \usepackagewasysym \usepackageamsfonts \usepackageamssymb \usepackageamsbsy \usepackagemathrsfs \usepackageupgreek \setlength\oddsidemargin-69pt \begindocument$$_3$$\enddocument phase.

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