Effects of Alkaline‐Earth‐Metal Addition on the Sinterability and Microwave Characteristics of (Zr,Sn)TiO₄ Dielectrics

Abstract

The sinterability and microwave dielectric properties of (Zr 0.8 Sn 0.2 )TiO 4 with additions of 1 mol% of magnesium, calcium, strontium, or barium were examined. All the alkalineearth metals were effective for densification, and the order of effectiveness was as follows: Mg < Ca < Sr < Ba. The dielectric constant and the temperature coefficient of the resonant frequency were not influenced very much by the additives; however, a strong deterioration of the quality factor (Q) did occur when magnesium was added. The presence of grain-boundary phases was confirmed via microstructural observation, using transmission electron microscopy. In addition, energy-dispersive X-ray analysis was performed to investigate the cause of the deterioration in the Q value.

Effect of MgO, BaO and La2O3 additions on microwave dielectric properties of (Zr0.8Sn0.2)TiO4 ceramics

“…It could be seen that when the sintering temperature is above 1340°C, all the samples showed a decrease in apparent density due to over-sintering. The sintering temperatures in this study were lower than those reported in the literature [9]. And it is observed that the apparent density of ZST ceramics increased firstly and then reduced when the ratio of BaO to MgO progressively increased.…”

“…We usually use a combination of two or more oxides as sintering aids such as ZnO, La 2 O 3 , CuO, NiO, Fe 2 O 3 , etc. to densify the ceramic at low temperature [4][5][6][7][8][9].…”

“…Kim and Pamu [8,9] have reported that all the alkaline earth metal oxides were effective for densification of ZST ceramics. Ioachim [10] reported that Mg-doped ZST ceramic materials has an excellent thermal stability of the dielectric constant, in the temperature range -150 to ?150°C of 6-7 ppm/°C.…”

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

“…Up to now, several ceramic systems with excellent dielectric performances have been developed, as listed in Table 2. 13,[76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95] In this section, current studies of applying P-V-L bond theory in the MWDC field with regard to structural-property investigations are summarized.…”

Synthesis of Nano-Crystalline Zr0.8Sn0.2TiO4 Powder by Choline-Chloride-Malonate Deep Eutectic Solvents

“…The intensity of diffraction peaks for the powder calcined at 450 °C is much higher and increases with elevating calcination temperature. This means that well-crystallized Zr 0.8 Sn 0.2 TiO 4 powders can be achieved by the Cm-DES at 450 °C, a temperature much lower than that in other preparation methods [6][7][8][9][10]. Generally speaking, high temperature (>1050 °C) is needed to prepare Zr 0.8 Sn 0.2 TiO 4 ceramics by traditional solid state reaction, which limits its application in new elds such as LTCC.…”