Pyroelectric properties of calcium doped strontium barium niobate ceramics Sr0.65−xCaxBa0.35Nb2O6 (x = 0.05–0.425)

Yao, Yingbang; Guo, Kailong; Bi, Daoguang; Tao, Tao; Liang, Bo; Mak, Chee Leung; Lu, Sheng‐Guo

doi:10.1007/s10854-018-9885-3

Cited by 11 publications

(14 citation statements)

References 32 publications

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“…Figure 8 shows Raman spectra of the TTB thin film grown on (111)Pt/TiO 2 /SiO 2 /(001)Si substrate (film F6). At room temperature, the spectra present typical signature of TTB phases compared with that reported for isostructural system [37][38][39][40][41], in agreement with X-ray diffraction and TEM analyses. Modes at 670 cm -1 and 731 cm -1 are assigned to the Nb-O stretching vibrations in the [NbO 6 ] octahedra, and modes located in the 70 to 400 cm -1 range is attributed to the O-Nb-O bending modes between adjacent [NbO 6 ] octahedra, as observed on other TTB niobates.…”

Section: Influence Of the Deposition Parameters To Grow Pure Knn Ttb supporting

confidence: 86%

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Aspe

Demange

Waroquet

et al. 2020

Journal of Alloys and Compounds

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Pulsed laser deposition parameters have been determined to synthesize pure Tetragonal Tungsten Bronze (TTB) phase thin films in the (K , Na)-Nb-O system (KNN). In relation to the high volatility of alkaline elements, it was found that the target composition and the targetsubstrate distance are of first importance. The TTB phase was identified by X-ray and electron diffraction and the surface microstructure consisting mainly of nanorods supports the formation of hallmark of the TTB phase. Poly-oriented nanorods have been obtained on both C-plane sapphire and (111)Pt/TiO 2 /SiO 2 /(001)Si substrates whereas horizontal nanorods oriented along the (hk0) planes have been grown on (100) and (110) SrTiO 3. All the nanorods are parallel together when grown on (110) SrTiO 3 and they present two in-plane orientations rotated of 90° from each other on (100) SrTiO 3. Dielectric characteristics (dielectric permittivity ε r , and loss tangent tanδ) have been measured at low (1 kHz-1 MHz) and high (1 GHz-40 GHz) frequencies, on films deposited on Pt coated silicon and sapphire, respectively. A value of ε r = 200 at 1 kHz with tanδ = 0.015 were measured in a parallel plate capacitor configuration, whereas ε r = 130 and tanδ = 0.20 at 10 GHz were retrieved from transmission lines printed on the KNN TTB thin film grown on C-plane sapphire. Raman investigations of the TTB films were performed in the temperature range 77-873 K, confirming the TTB phase formation and the absence of structural transition. Piezoelectric Force Microscopy measurements evidenced a piezoelectric signal although no switching could be performed. However the dielectric measurements, complicated by high leakage currents when a DC voltage was applied, did not evidence any proof of ferroelectricity for the undoped KNN TTB films whereas results reported on other niobates (A,A') 0.6 Nb 10 O 30 (with A: K, Na and A': Sr, Ba, Ca) have shown Curie temperatures, lying between 156°C and 560°C, separating the paraelectric phase (space group: P4/mbm N°127) and the ferroelectric one (space group: P4bm N°100).

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Section: Influence Of the Deposition Parameters To Grow Pure Knn Ttb supporting

confidence: 86%

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Aspe

Demange

Waroquet

et al. 2020

Journal of Alloys and Compounds

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“…Перед измерениями образцы были поляризованы в постоянном электрическом поле 2 kB/mm. который, благодаря малому ионному радиусу, может занимать вакантные позиции C в структуре TTB [10].…”

Section: исследование физических свойствunclassified

“…Поскольку модифицирующие добавки выбирались исходя из того, что составляющие их ионы могут входить в структуру TTB, занимая те же позиции, что и ионы CBN, полученные результаты интерпретируются следующим образом. Ионы Ta и Ti замещают Nb в центре кислородного октаэдра [10]. Но, поскольку радиус иона Ta сравним с ионным радиусом Nb, а ионный радиус Ti меньше, его внедрение изменяет дипольный момент сильнее, чем внедрение иона Ta.…”

Section: пироэлектрический эффектunclassified

“…В то же время общая формула для материалов со структурой TTB имеет вид: A1 2 A2 4 C 4 B 10 O 30 и имеет широкие возможности для получения различных моди-фикаций твердых растворов [9,10]. Так, положение A1 и A2 могут занимать как щелочноземельные, так и щелочные металлы (т. е. элементы первой и второй группы таблицы химических элементов).…”

Section: Introductionunclassified

“…Наиболее изученным из данного класса материалов является кристалл ниобата бария−стронция (SBN), в связи с этим большинство работ по керамикам на основе TTB также посвящено различным модификациям материала SBN [10][11][12][13]. В то же время, одним из недостатков для практического применения SBN является его низкая температура фазового перехода (менее 100 • C).…”

Section: Introductionunclassified

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Влияние модификаторов SrTiO-=SUB=-3-=/SUB=-, KTaO-=SUB=-3-=/SUB=- и LiTaO-=SUB=-3-=/SUB=- на диэлектрические свойства керамики Ca-=SUB=-0.3-=/SUB=-Ba-=SUB=-0.7-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=-

Малышкина¹,

Гусева²,

Митченко³

et al. 2022

Физика Твердого Тела

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Using the method of solid-phase synthesis, we obtained ceramic samples with a structure like tetragonal tungsten bronzes, pure Ca0.3Ba0.7Nb2O6 (CBN30) and with modifying additives SrTiO3, KTaO3, or LiTaO3. The dispersion of the permittivity in the frequency range from 1 Hz to 10 MHz, the temperature dependences of the permittivity (in the given frequency range) and the pyroelectric coefficient are studied. It is shown that if the introduction of the LiTaO3 impurity into the composition of CBN30 destabilizes the dielectric characteristics at frequencies above 100 kHz, then the SrTiO3 impurity increases both the permittivity and the pyroelectric coefficient, significantly reducing dielectric losses at low (1 – 10 Hz) frequencies. At the same time, both of these impurities (SrTiO3 and LiTaO3) lead to sample depolarization during heating above 150°C, while the KTaO3 impurity, which slightly increases the permittivity and pyroelectric coefficient, does not affect the stability of the polarized state during heating up to higher temperatures.

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Pyroelectric Materials and Applications

2022

Pyroelectric Materials

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Pyroelectric properties of calcium doped strontium barium niobate ceramics Sr0.65−xCaxBa0.35Nb2O6 (x = 0.05–0.425)

Cited by 11 publications

References 32 publications

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Влияние модификаторов SrTiO-=SUB=-3-=/SUB=-, KTaO-=SUB=-3-=/SUB=- и LiTaO-=SUB=-3-=/SUB=- на диэлектрические свойства керамики Ca-=SUB=-0.3-=/SUB=-Ba-=SUB=-0.7-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=-

Pyroelectric Materials and Applications

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