Low-fired Li2Mg3ZrO6-based composite ceramics with temperature-stable for LTCC applications

Design of a Novel Near-Infrared Luminescence Material Li2Mg3TiO6:Cr3+ with an Ultrawide Tuning Range Applied to Near-Infrared Light-Emitting Diodes

“…39-0392 of Li 2 Mg 3 SnO 6 , which has a very similar lattice structure to Li 2 Mg 3 TiO 6 , was used as the standard card here. All the diffraction peaks of the as-synthesized sample LMT agree well with those reported previously, which proves the successful doping of Cr 3+ into the LMT crystal lattice. − The enlarged XRD patterns near 43° are displayed in the inset of Figure a as illustrative evidence that the diffraction peak shift toward a higher angle side may be caused by the continuous increase of the Cr 3+ doping concentration. Since the ionic radii of Cr 3+ (0.615 Å, CN = 6) and Ti 4+ (0.605 Å, CN = 6) are very similar in the crystal and the ionic radius of Mg 2+ (0.72 Å, CN = 6) is slightly larger than that of Cr 3+ , this peak shift implies that the [Cr 3+ –Cr 3+ ] unit tends to replace the lattice sites of the [Mg 2+ –Ti 4+ ] unit.…”

“…As shown in Figure d, the crystal structure of LMT:Cr 3+ is cubic, and the space group belongs to Fm 3̅ m . In this structure, all the cations occupy the Wyckoff position and form an octahedral environment in the form of six coordinations (CN = 6). − In summary, the double Cr 3+ model in which [Cr 3+ –Cr 3+ ] is designed to replace the [Mg 2+ –Ti 4+ ] unit is consistent with the experimental and calculated results. Even in the case where LMT: x Cr 3+ has a high concentration of Cr 3+ ( x = 0.5), no impure phase was detected, which further proved the successful implementation of the double Cr 3+ model strategy.…”

A broadband near-infrared Cr3+-doped phosphor applied to near-infrared light-emitting diodes: enhanced luminescence and thermal stability by annealing

“…In such a cubic structure, all types of cations including Li + , Mg 2+ , Sn 4+ and Cr 3+ occupy the same Wyckoff site and are bonded with six oxygen anions O 2− to form an octahedral geometry (CN = 6). 39,40 In summary, even in the case of a high Cr 3+ content (x = 0.3) in the LMS: xCr 3+ sample, no impure phase was detected by XRD, further proving that Cr 3+ is successfully doped into the LMS material.…”

Microwave dielectric properties of Na+-substituted CaMg0.9Li0.2Si2O6 ceramics

“…In the field of 5G communication and the Internet of Things, microwave dielectric ceramics with low dielectric constant are often used in microwave substrates, because according to Td = L ξ ߝ /c(where L is the distance travelled by the signal, and c is the speed of light), low dielectric constant can effectively reduce the time delay of high-frequency signals during transmission [1,2]. At the same time, LTCC technology, which requires sintering temperature below 950Ԩ, has been paid more attention in the research of microwave dielectric ceramics to follow the development trend of device miniaturization and integration [3][4][5].…”