Lattice evolution, order transformation, and microwave dielectric properties of the Zn_(1-x)Li_(2x)TiO_(3)(0≤x≤1) system ceramics

Research on doping modification of ZnTiO_(3) ceramics to enhance microwave dielectric properties has been hindered by poor performance,unclear structure-function mechanisms.To expand the applicability of ZnTiO_(3) ceramics,this study explores Zn_(1-x)Li_(2x)TiO_(3)(O≤×≤1)ceramics using a phase engineering strategy.Our findings reveal that the introduction of Lit into the ZnTiO_(3) system initiates a multiple phase transition,starting at x=0.1.Initially,ilmenite ZnTiO_(3) transforms into a cubic ordered spinel phase(space group P4332).Subsequently,a transition to a disordered spinel phase(space group Fd3m)occurs at x=0.5,culminating in the formation of a monoclinic rock salt-structured LizTiO3 phase.Significantly,two sets of ceramics with near-zero temperature coefficients of resonance frequency(t:)were obtained at x=0.1 and 0.75.Moreover,the quality factor(Qxf)demonstrated a 4.4-fold increase compared to that of ZnTiO_(3) ceramics at x=0.25(105,013 GHz).Additionally,it was observed that the Ti4 polarization in Zn_(1-x)Li_(2x)TiO_(3) ceramics was underestimated by 11.3%-13.3%,causing the measured dielectric constant(e.)exceeding the theoretical dielectric constant(eth).The ionic polarizability of Ti*was adjusted to stabilize around 3.29 A.Evaluation using multiple methods,including Phillips-van Vechten-Levine(P-V-L)theory,Raman vibrational mode analysis,bond valence,bond energy theory,and octahedral distortion,confirms that the Ti-O bonds within the octahedron predominantly affect&r,the increasing lattice energy(U)contributes to the enhancement of Qxf,and the strengthened Li-O bond energy effectively regulates Tr.

Integration of all-printed zinc ion microbattery and glucose sensor toward onsite quick detections

Rational design of microsystems and efficient integration of various functional modules that can directly realize the aimed functions are very attractive for portable and onsite practical applications,which is also significant in developing miniaturized and intelligent electronics and equipment.Unlike the conventional electrochemical glucose sensors that always need auxiliary complex systems for power supply,signal processing,and feedbacks,we design an all-printed glucose sensor integrated with a zinc ion microbattery(ZIMB)as a micropower source for portable and onsite quick glucose detections.The integrated glucose sensor(GS)and ZIMB(iGS-ZIMB)systempossesses a high areal energy density of 247.3μWh/cm^(2) and power density of 1193μW/cm^(2) and exhibits high sensitivity up to 464.2μA/mM/cm^(2),wide linear range of 0.5-6.0 mM,and good reproducibility in glucose detections.Through a simple amplification circuit design,the glucose concentration signals could be displayed within a short response time of 1.6 s without the need of external auxiliary equipment.Such iGS-ZIMB microsystem has prominent advantages in efficiency and cost and is promising for onsite medical and healthcare applications.