Structures and microwave dielectric properties of Ca(1−x)Nd2x/3TiO3 ceramics

Resonance Raman spectroscopy of NdAlO3 single-crystal fibers grown by the laser-heated pedestal growth technique

“…Owing to their high optical quality, LnAlO 3 -based systems are applied as ultraviolet-to-red converter and laser-related materials [9]. Some of these monoaluminates are also employed as resonators and filters for wireless communication devices [10], once such materials present high relative permittivity (16)(17)(18)(19)(20)(21)(22)(23) and low dielectric loss in the range of micro-and millimeter-waves, being enhanced in the CaTiO 3 -based solid solutions [11]. space group for Ln = Sm, Eu, Gd, Dy, Ho or Er [2,4,10].…”

Structure and microwave dielectric characteristics of lithium-excess Ca0.6Nd0.8/3TiO3/(Li0.5Nd0.5)TiO3 ceramics

“…With DLAs, miniaturization can be achieved by increasing the relative permittivity (e r ) whilst still maintaining a low temperature coefficient of the resonant frequency (t f ) and a microwave quality factor (Q), high enough to maintain a stable circularly polarized field [1,2]. Therefore, microwave dielectric materials with a high dielectric constant (e r ), a high quality factor (Q) and a near zero temperature coefficient of resonant frequency (t f ) for use as dielectric resonators and DLAs have also been developed by many researchers [1][2][3][4][5][6][7].…”

“…In the previous study, a number of microwave ceramics with high e r , such as A-site complex perovskite A þ1 1=2 A þ3 1=2 TiO 3 , the tungsten bronze type BaOLn 2 O 3 -TiO 2 , the combine compounds CaO-Li 2 O-Ln 2 O 3 -TiO 2 , and the Pb-based ceramics were developed [6][7][8][9][10][11]. Among these materials, the solid solution system of (1Ày)Ca 1Àx RE 2x/3 TiO 3 Ày(Li 1/ 2 RE 1/2 )TiO 3 (RE = La, Nd and Sm), is a promising material with high e r , moderate Q Â f values and adjustable temperature coefficient [12][13][14][15][16][17][18].…”

Effects of Bi3+ substitution for Nd3+ on microwave dielectric properties of Ca0.61(Nd1−Bi )0.26TiO3 ceramics

“…Among them, the orthorhombic distorted perovskite Ca 0.61 Nd 0.26 TiO 3 is widely viewed as a potential candidate material for microwave dielectric applications because it has a high dielectric constant (ε r ~87.5), a high quality factor (Q×f ~12,400 GHz), and a lower positive temperature coefficient of resonant frequency (τ f ~242 ppm/°C) [3]. Some researchers have reported that the high positive τ f of CaTiO 3 -based ceramics can be suppressed to low value or zero value with addition of negative τ f of perovskite compounds [4,5].…”