Synthetic strategies for new inorganic oxide fluorides and oxide sulfates

Electrical properties of fluorine-intercalated layered manganite: La1.4Sr1.6Mn2O7F2

“…This leads to a significant expansion in the c-axis as the separation between perovskite blocks is increased. The overall structure of the perovskite blocks is preserved, but is noticeably distorted with the apical Mn-O bond directed towards the rocksalt layers being significantly shorter than that in the center of the perovskite blocks [17]. A variety of fluorinating agents such as F 2 gas, NH 4 F, CuF 2 or poly(vinylidene fluoride) (PVDF) can be used to prepare LaSrMnO 4 F and Ln 1.2 Sr 1.8 Mn 2 O 7 F 2 [16][17][18].…”

“…The overall structure of the perovskite blocks is preserved, but is noticeably distorted with the apical Mn-O bond directed towards the rocksalt layers being significantly shorter than that in the center of the perovskite blocks [17]. A variety of fluorinating agents such as F 2 gas, NH 4 F, CuF 2 or poly(vinylidene fluoride) (PVDF) can be used to prepare LaSrMnO 4 F and Ln 1.2 Sr 1.8 Mn 2 O 7 F 2 [16][17][18]. To the best of our knowledge, there is neither previous report on the electrical properties of the LaSrMnO 4 F, La 1 [16][17][18].…”

“…0.5 H 2 O [13], Sr 3 Mn 2 O 6 F y with y = 1, 2 and 3 [14], Sr 2 TiO 3 F 2 and Ca 2 CuO 2 F 2 [15], Ln 1.2 Sr 1.8 Mn 2 O 7 F 2 (Ln = Pr, Nd, Sm, Eu, and Gd) [16]. The fluorine intercalation layered manganites LaSrMnO 4 [9,[16][17][18][19]. The fluorination proceeds in an oxidative manner with fluorine being inserted into interstitial sites between the (La/Sr)O rocksalt layers.…”

“…A variety of fluorinating agents such as F 2 gas, NH 4 F, CuF 2 or poly(vinylidene fluoride) (PVDF) can be used to prepare LaSrMnO 4 F and Ln 1.2 Sr 1.8 Mn 2 O 7 F 2 [16][17][18]. To the best of our knowledge, there is neither previous report on the electrical properties of the LaSrMnO 4 F, La 1 [16][17][18]. The resulting parallelepiped sample was then ground into powders and then mixed with additional NH 4 F (1:1 molar ratio).…”

Oxyfluoride Chemistry of Layered Perovskite Compounds

“…The RP-type layered manganese oxides, LaSrMnO 4 (n = 1) and Ln 1.2 Sr 1.8 Mn 2 O 7 (Ln = Pr, Nd, Sm, Eu, and Gd) (n = 2), accommodate fluorine in the (La/Sr)O rock-salt layers between the Mn-O perovskite blocks, followed by large expansion of the c-axis of 1 ~ 3 Å (see Figure 6). Utilization of F 2 gas, NH 4 F, CuF 2 or PVDF as a fluorination agent at low temperatures yields LaSrMnO 4 F 2 [26,27] [30]. In the fluorinated phase, fluorine is inserted in the tetrahedral sites of Sr 4 in rock-salt layers between perovskite blocks (see Figure 7).…”