Open AccessСтруктурные и электрические характеристики двухслойных тонких пленок Bi-=SUB=-4-=/SUB=-Ti-=SUB=-3-=/SUB=-O-=SUB=-12-=/SUB=-/(Ba,Sr)TiO-=SUB=-3-=/SUB=-, осажденных на кремниевую подложку методом высокочастотного распыления при повышенных давлениях кислорода
Author(s) -
А. С. Анохин,
С.В. Бирюков,
Ю.И. Головко,
В. М. Мухортов
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.02.47126.179
Subject(s) - crystallite , monoclinic crystal system , materials science , polarization (electrochemistry) , crystallography , thin film , substrate (aquarium) , crystal structure , chemistry , nanotechnology , oceanography , geology
The 400–450-nm-thick Bi_4Ti_3O_12 thin films with various orientations of crystallites with respect to a normal to the (100)Si substrate plane have been studied. It is established that the crystallite orientation can be controlled by varying the composition of the 4-nm-thick Ba_ x Sr_1 – _ x TiO_3 sublayer. The use of Ba_0.4Sr_0.6TiO_3 as a sublayer leads to the growth of the Bi_4Ti_3O_12 film in the single-crystal state with plane (001) parallel to the substrate plane and with a monoclinic distortion of the crystal structure. The Ba_0.8Sr_0.2TiO_3 sublayer is shown to lead to the formation of four crystallite orientations: (111), (117), (100), and (110) and two groups of domains in the Bi_4Ti_3O_12 film; the first group with the polarization direction p-erpendicularly to the substrate and the second group with the polarization directed in the angular range 45.2°–57° with respect to a normal to the substrate. It is shown that, in the Bi_4Ti_3O_12 film with the Ba_0.8Sr_0.2TiO_3 sublayer, the polarization is directed to the substrate and is switched to new stable state with the polarization direction from the substrate when applying an external voltage higher than a critical one (4 V).