The role of B-site cations on proton conductivity in double perovskite oxides La2MgTiO6 and La2MgZrO6

Abstract

Manuscript 1: The role of B-site cations on proton conductivity in double perovskite oxides La 2 MgTiO 6 and La 2 MgZrO 6 …………………………………………………….. Manuscript 2: Proton conductivity in solid solution 0.7(CaWO 4)-0.3(La 0.99 Ca 0.01 NbO 4) and Ca (1-x) La x W (1-y) Ta y O 4 ………………………………………...

Two-Site Occupation for Exploring Ultra-Broadband Near-Infrared Phosphor—Double-Perovskite La2MgZrO6:Cr3+

“…It has been reported that the LMZ double-perovskite oxide crystallizes in the monoclinic P 2 1 / n space group Figure a presents the XRD patterns of La 2 Mg 1–0.5 x Zr 1–0.5 x O 6 : x Cr ( x = 0.01–0.08), the structure reference is taken from the calculation data because of the lack of a standard JCPDS card.…”

“…In addition, Vigen et al suggested that a complete 1:1 ordering of the B-sites did not occur, which was unusual compared to other double-perovskite oxides with similar or higher tolerance factors than LMZ . The local disorder of two octahedrons has been observed in some double-perovskite oxides.…”

“…The double-perovskite oxides A 2 B′B″O 6 have drawn increasing attentions because of their interesting properties and potential applications. − In this work, LMZ is chosen as the host for Cr 3+ ions for the first time. LMZ is a stable oxide with two distorted octahedral moieties in it . Previous studies of Cr 3+ -doped double-perovskites, that is, Ca 2 MgWO 6 :Cr and La 2 MgGeO 6 :Cr, showed that Cr 3+ ions were merely restricted in Mg 2+ sites because the other octahedron (WO 6 or GeO 6 ) was too small for the Cr 3+ cosubstitution. , Besides, the main focus of previous investigations is on long-persistent luminescence.…”

Photoluminescence tuning in a novel Bi3+/Mn4+ co-doped La2ATiO6:(A = Mg, Zn) double perovskite structure: phase transition and energy transfer

“…To further investigate the crystal structure of solid solution, the XRD patterns of LM (1-w) Z w T:0.005Bi 3+ , 0.002Mn 4+ (0 ≤ w ≤ 1) with 2θ range from 10° to 120° were performed with Rietveld refinement. Almost all reflection peaks for w = 0 sample, besides small amounts of tiny peaks which belongs to MgO phase, are indexed by orthorhombic cell (Pbnm) with parameters close to La 2 MgTiO 6 (double perovskite-type structure), 33,34 as shown in Figure 1b. Other XRD Rietveld refinement patterns for w = 0.25-1.0 samples are listed in Fig-ure S1 (Supporting Information).…”

Alkali metals as efficient A-site acceptor dopants in proton conducting BaZrO3

“…Although A-site doping of BaZrO 3 has been largely overlooked in literature, it has been shown to reduce the degree of defect trapping signicantly compared to B-site doping in other oxides such as LaScO 3 , LaGaO 3 and LaNbO 4 . [14][15][16][17] Additionally, experimental work on BaZrO 3 co-doped with K on the A-site and Y on the B-site demonstrated that the partial proton conductivity was enhanced relative to that of Y-doped BaZrO 3 . However, due to the presence of multiple dopants, it is difficult to ascertain how these compositions are actually affected by K-doping.…”