Manganese-modified BiScO3–PbTiO3 piezoelectric ceramic for high-temperature shear mode sensor

Abstract

The bismuth-based perovskite solid solution (100−x)BiScO3−xPbTiO3 (BSPT) was investigated for use at temperatures up to 400°C and above. The high-temperature resistivity, together with dielectric and piezoelectric behaviors of the shear mode for manganese-modified BSPT ceramics near the morphotropic phase boundary composition were studied. The resistivity and time constant were found to be 3×107Ωcm and 0.08s, respectively, at 450°C for modified BSPT66. The dielectric constant Κ11T and dielectric loss were found to be 1112 and 1%, respectively, at room temperature, showing a Curie temperature at 468°C. The electromechanical coupling factor k15 was calculated to be 61%, staying nearly constant up to 440°C, expanding the temperature usage range significantly. The properties indicate that the modified BSPT66 material is a promising candidate for high-temperature shear sensor applications.

Сегнетоэлектрические релаксорные свойства образцов системы (1-2x)BiScO-=SUB=-3-=/SUB=-· xPbTiO-=SUB=-3-=/SUB=-· xPbMg-=SUB=-1/3-=/SUB=-Nb-=SUB=-2/3-=/SUB=-O-=SUB=-3-=/SUB=- (0.30≤ x≤0.46)

“…Керамика твердых растворов (1 − x)BiScO 3 · xPbTiO 3 (BS−PT) со структурой перовскита с составами близкими к морфотропной фазовой границе (МФГ) между их ромбоэдрической и тетрагональной фаза-ми (x = 0.64), характеризуется пьезомодулями d 33 ∼ ∼ 400 pC/N [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], сопоставимыми по величине с пьезо-модулями цирконата-титаната свинца (ЦTС) -широко используемой пьезокерамики [17][18][19]. При этом точка Кюри керамики BS−PT (T c ∼ 720 K) превышает T c ЦТС на ∼ 100 K, что позволяет повысить температурный диапазон ее использования.…”

Piezoelectric materials for high temperature transducers and actuators

“…Since the initial measurements of BSPT, many research groups have tried to increase both the low resistivity inherent with the BiScO 3 end member, and electrical properties by varying grain size [52] and introducing dopants [26,54,81], but as yet there have been no significant improvements without a dramatic loss in T C and k p [82].…”

“…PZT suffers from rapid aging, leading to depoling, which means it is not typically suitable for use above *200°C [12,26]. The properties of PZT are summarised in Table 1.…”

High temperature ultrasonic immersion measurements using a BS-PT based piezoelectric transducer without a delay line

“…BS-PT [(1-x) BiScO3-xPbTiO3] at its morphotropic phase boundary (MPB) (x=0.64) is a promising candidate for high temperature applications because of its relatively high piezoelectric response as compared to lithium niobate and aluminum nitride [49][50][51][52][53][54][55][56][57].…”