Crystal Structures and Optical Properties of Transparent Ceramics Based on Complex Perovskite Ba(M⁴⁺,B₁²⁺,B₂⁵⁺)O₃ (M⁴⁺=Ti, Sn, Zr, Hf; B₁²⁺=Mg, Zn; B₂⁵⁺=Ta, Nb)

Abstract

We investigated the crystal structures and optical properties of Ba(M,Mg,Ta)O3, Ba(M,Zn,Ta)O3, and Ba(M,Mg,Nb)O3 (M=Ti, Sn, Zr, and Hf) transparent ceramics. Tetravalent cation substitution resulted in a reduction in the 1:2 order structure of the B‐site of the parent perovskites; this in turn led to an increase in the transmittance of the ceramics. There was an increase in the refractive index of Ba(Mg1/3Ta2/3)O3 due to Ti, Zr, and Hf substitution at the B‐site; the refractive index was particularly high in the case of Ti substitution. Furthermore, Ti substitution resulted in a significant decrease in the Abbe number of Ba(Mg1/3Ta2/3)O3. The refractive index of the perovskites was calculated with high accuracy using the Gladstone–Dale relation. We hypothesize that the Abbe number of perovskites is dependent on its band‐gap energy.

Abnormal Partial Dispersion in Pyrochlore Lanthanum Zirconate Transparent Ceramics

“…[7][8][9] We have developed a pyrochlore La 2 Zr 2 O 7 (LZO) transparent ceramic and found that it showed a largely negative abnormal partial dispersion. In this article, we report the optical properties of LZO transparent ceramics; furthermore, we aim to determine the origin of its abnormal dispersion by comparing it with other transparent ceramics such as perovskite Ba(Zr,Mg,Ta)O 3 (BZMT) 10 and LaAlO 3 -Sr(Al , Ta)O 3 (LAO-SAT) 11 , which show normal dispersion.…”

Structure and optical properties of Sn4+ doped Ba(Mg1/3Nb2/3)O3 transparent ceramics

“…According to a previous study, substitution of B-site cations is an effective way to reduce the ordering degree of A(B 0 B″)O 3 . In the cases of Ba(Mg 1/3 Ta 2/3 ) O 3 (BMT) and Pb(Zr 1 À x Ti x )O 3 (PZT), disordered ceramics were fabricated with cations that are partially substituted by M 4 þ (M ¼ Ti, Sn, Zr and Hf) and La 3 þ , respectively [11][12][13][14]. However, Sn 4 þ doped BMT transparent ceramics are still found to be mixed phase of the ordered-disordered type [15].…”

Effects of Sintering and Annealing Temperature on Fabrication of Transparent Lu2Ti2O7 by Spark Plasma Sintering

“…Y 3 Al 5 O 12 (YAG), a widely used laser medium, can be fabricated with high transparency for high‐power lasers by vacuum sintering using house‐made nanopowder 2 . Transparent ceramics such as (Pb, La)(Zr, Ti)O 3 (PLZT) 3 and complex perovskite Ba(Sn, Zr, Mg, Ta)O 3 4 have also been reported for their use in electro‐optical devices and optical imaging systems. Compared with single crystals, transparent ceramics have several advantages, such as ease of fabrication in large volumes and complicated‐structures, heavy and homogeneous doping with active ions, and productivity of high‐melting‐point materials at relatively low temperatures.…”