本文選題：顯微結(jié)構(gòu)　切入點(diǎn)：鈣鈦礦　出處：《壓電與聲光》2017年05期 　論文類型：期刊論文

【摘要】：采用傳統(tǒng)固相合成法制備0.1La(Mg_(0.5)Ti_(0.5))O_3-(0.9-x)CaTiO_3-x(Li_(0.5)Sm_(0.5))TiO_3(LMT-CT-LST,摩爾比x=0.1~0.6)系列微波介質(zhì)陶瓷,并研究該系列微波介質(zhì)陶瓷的物相結(jié)構(gòu)、表面形貌及微波介電性能。X線衍射(XRD)研究表明,所有的LMT-CT-LST樣品均為鈣鈦礦結(jié)構(gòu)。掃描電鏡(SEM)表明,隨著(Li_(0.5)Sm_(0.5))TiO_3含量的增加,樣品的晶粒尺寸會(huì)不斷增加。當(dāng)x=0.6時(shí),有些晶粒會(huì)出現(xiàn)異常長大現(xiàn)象,這對(duì)樣品的微波介電性能有很大的影響。介電性能研究結(jié)果顯示,隨著(Li_(0.5)Sm_(0.5))TiO_3含量從0.1增加至0.6,介電常數(shù)(εr)略微從121.56減小至117.5,而對(duì)應(yīng)的品質(zhì)因數(shù)(Q×f)從10 055.71GHz降低至4 042.15GHz;此外,該體系諧振頻率溫度系數(shù)(τf)隨(Li_(0.5)Sm_(0.5))TiO_3含量的增加逐漸向負(fù)值方向移動(dòng)。當(dāng)x=0.6時(shí),復(fù)合陶瓷在1 340℃燒結(jié)4h,可獲得最佳的綜合微波介電性能,即ε_(tái)r≈117.5,Q×f≈4 042.15GHz(f=3.415 GHz),τ_f≈10.13×10-6/℃。
[Abstract]:A series of microwave dielectric ceramics were prepared by traditional solid state synthesis method. The series of microwave dielectric ceramics were prepared by the traditional solid state synthesis method. The phase structure, surface morphology and microwave dielectric properties of the microwave dielectric ceramics, such as the phase structure, surface morphology and microwave dielectric properties of the microwave dielectric ceramics, were studied by means of X-ray diffraction (XRD). All the LMT-CT-LST samples are perovskite structure. SEM (SEM) shows that the grain size of the LMT-CT-LST samples will increase with the increase of the content of LiSZ 0.5SmSq / TiO3.When x0. 6, some grains will grow abnormally. This has a great effect on the microwave dielectric properties of the samples. The results of the dielectric properties study show that with the increase of the content of TiO3 from 0.1 to 0.6, the dielectric constant (蔚 r) decreases slightly from 121.56 to 117.5, and the corresponding quality factor Q 脳 f decreases from 10 055.71 GHz to 4 042.15 GHz; in addition, the dielectric constant (蔚 r) is slightly reduced from 121.56 to 117.5 GHz to 4 042.15 GHz, and the corresponding quality factor Q 脳 f decreases from 10 055.71 GHz to 4 042.15 GHz. The temperature coefficient of resonance frequency (蟿 f) of the system moves gradually to a negative direction with the increase of the content of TiO3. The optimum comprehensive microwave dielectric properties can be obtained when the composite ceramics are sintered at 1 340 鈩，

本文編號(hào)：1589480