44 results about "Saturation polarization" patented technology

An alloy of Fe100-a-b-c-d-x-y-zCuaNbbMcTdSixByZz and up to 1 atomic % impurities; M is one or more of Mo or Ta, T is one or more of V, Cr, Co or Ni and Z is one or more of C, P or Ge, wherein 0.0 atomic %≤a<1.5 atomic %, 0.0 atomic %≤b<3.0 atomic %, 0.2 atomic %≤c≤4.0 atomic %, 0.0 atomic %≤d<5.0 atomic %, 12.0 atomic %<x<18.0 atomic %, 5.0 atomic %<y<12.0 atomic % and 0.0 atomic %≤z<2.0 atomic %, and wherein 2.0 atomic %≤(b+c)≤4.0 atomic %, produced in the form of a strip and having a nanocrystalline structure in which at least 50% by volume of the grains have an average size of less than 100 nm, a remanence ratio Jr / Js<0.02, Jr being the remanent polarization and Js being the saturation polarization, and a coercitive field strength Hc which is less than 1% of the anisotropic field strength Ha and / or less than 10 A / m.

The invention discloses a lead-site-doped methylamine-lead-iodine single crystal thin film and a preparation method thereof. The single crystal thin film is made of CH 3 NH 3 PB 3 As the parent body, La is doped at the lead site, and the molecular formula is CH 3 NH 3 Pb 1‑x La 2x / 3 I 3 ( x =0.005‑0.19) single crystal thin film, doped with Sm at the lead site, the molecular formula is CH 3 NH 3 Pb 1‑y SM 2y / 3 I 3 ( x =0.005‑0.19) single crystal film, doped with Pr at the lead site, the molecular formula is CH 3 NH 3 Pb 1‑z PR z I 3 ( z =0.005‑0.27) single crystal film. The present invention effectively improves the saturation polarization intensity, remnant polarization intensity, piezoelectric coefficient and mobility of carriers through the doping of La, Sm, and Pr elements, and the substitution of lead greatly improves its photoelectric performance and reduces The toxicity brought by the heavy metal lead is eliminated, the process is simple, the preparation process is easy to control, and the repeatability is high.

The invention discloses a hydrated L-tartaric acid neodymium sulfate ferroelectric functional material and a preparation method thereof. The ferroelectric functional material has a molecular formula of {Nd2(H2O)2(L-C4H4O6)2(SO4)}.4H2O. The ferroelectric functional material has the following ferroelectric characteristic parameters: the remanent polarization 2Pr is 0.390 mu C / cm<2>; the coercive electric field 2Ec is 74.7 kv / cm; and the saturation polarization Ps is 0.307 mu C / cm<2>. The saturation polarization of the ferroelectric functional material is 1.23 times that of seignette salt, so that the ferroelectric functional material disclosed by the invention is a novel ferroelectric body with excellent ferroelectric performance. The preparation method comprises the following steps: carrying out a solvothermal reaction between neodymium oxide and L-tartaric acid by using an ethanol solvent; and adding a sulfuric acid solution into the mixture and nucleating in a reaction kettle so as to grow into the hydrated L-tartaric acid neodymium sulfate. The preparation method has the advantages of short flow, simple process, low equipment requirement, no pollution and low cost and can be easily industrialized.

A liquid-ejecting head includes a pressure-generating chamber communicating with a nozzle opening and includes a piezoelectric element including a piezoelectric layer and electrodes. The piezoelectric layer contains bismuth sodium potassium titanate and satisfies the inequality 0≦Pr / Pm≦0.25 at 25° C., where Pm and Pr are the saturation polarization and remanent polarization, respectively, of the piezoelectric layer.