Microwave Dielectric Properties and Microstructures of CuO-Modified (1-x)(Mg_0.95Co_0.05)TiO₃–xCaTiO₃ Ceramic System

Abstract

We report simultaneous cooling and trapping of metastable 84 Kr ( 84 Kr*) and metastable 86 Kr ( 86 Kr*) atoms by overlapping the cooling laser beams for these different isotopes in the same region of a magneto-optical trap (MOT). Approximately 2 × 10 5 atoms of each isotope were trapped in this two isotope-MOT (TIMOT). We have investigated the heteronuclear collision trap loss rates for each isotope due to the presence of cold atoms of other isotope using the TIMOT loading curves. The two body heteronuclear loss rate coefficient * * Kr Kr 84 86 β − (i.e. for the loss of 84 Kr* due to presence of 86 Kr*) and the reciprocal loss rate coefficient * * Kr Kr 86 84β − (i.e. for the loss of 86 Kr* due to presence of 84 Kr*) are measured to be (8.7 ± 0.8) × 10 −10 cm 3 s −1 and (8.8 ± 0.8) × 10 −10 cm 3 s −1 respectively for laser beam intensity values of 21 mW cm −2 (for cooling of 84 Kr*) and 64 mW cm −2 (for cooling of 86 Kr*). The dependence of heteronuclear cold collision loss rate on cooling laser beams intensity has also been studied and compared with homonuclear cold collision loss rate.

Grain size engineered 0.95MgTiO3–0.05CaTiO3 ceramics with excellent microwave dielectric properties and prominent mechanical performance

“…29,30 The physics of resin under pressure is similar to the seepage pr lar approaches have been used also to mod into a mold containing fiber mats. 23,[31][32][33][34][35][36][37][38] T in these cases to determine the resin flow ing times corresponding to different infilt Preceramic polycarbosilane polymers as precursors to make ceramic fibers 10,3 trix. [7][8][9]40,41 The chemical and volume ch pany ceramization of the polymer during documented in several studies.…”

“…With the rapid development of microwave communication technologies, microwave dielectric materials for resonator filters, oscillators, antennas, and capacitors have attracted considerable attention [1][2][3] in the past decades. For microwave dielectric materials, it is preferable to have an appropriate relative permittivity ( r ), a low dielectric loss (usually characterized by Q × f, where Q = 1/tanδ) for high-frequency selectivity, and a near-zero temperature coefficient of resonant frequency ( f ) for high-temperature stability.…”