SrTiO3 POLY
Grade
POLY = polycrystalline sintered SrTiO3 ceramic
Choose for bulk capacitor/GBBL dielectric bodies, sputtering targets and low-cost high-permittivity ceramic parts.
Values for the POLY condition
Other SrTiO3 tempers and conditions
SrTiO3 is listed in 3 conditions; see the grade overview at SrTiO3.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Nb-doped conductive single crystal | Choose when the substrate must also serve as a bottom electrode / back-contact for ferroelectric, memristor or photocatalysis devices. | — | 60 | 0 | 690 HV | 9 W/m·K |
POLYThis page Polycrystalline sintered SrTiO3 ceramic | Choose for bulk capacitor/GBBL dielectric bodies, sputtering targets and low-cost high-permittivity ceramic parts. | — | — | — | 600 HV | 6 W/m·K |
SC-100Default Undoped single crystal, (100) epi-polished substrate | Choose for epitaxial growth of oxide/superconductor films and for high-index optical or dielectric single-crystal parts. | — | — | — | 690 HV | 12 W/m·K |
What is SrTiO3 POLY?
SrTiO3 POLY is SrTiO3 in the POLY grade — choose for bulk capacitor/GBBL dielectric bodies, sputtering targets and low-cost high-permittivity ceramic parts. The elastic modulus is 220 GPa (31.9 Msi). SrTiO3 POLY has a density of 4.98 g/cm³ (0.18 lb/in³), heavier than 51% of ceramic grades. It melts at 2,080°C (3,776 °F). SC-100 is the default condition FabDigit quotes; POLY is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 92/100, better than 89% of ceramic grades
Limitations
- Low fracture toughness — 1 MPa·√m (0.91 ksi·√in), worse than 84% of ceramic grades
SrTiO3 POLY properties
Typical room-temperature values for SrTiO3 POLY; 16 are specific to this condition. Other listed values are SrTiO3 reference data and may not represent this condition. Bars are the position among ceramic grades.
Physical5
SrTiO3 POLY has a density of 4.98 g/cm³ (0.18 lb/in³), heavier than 51% of ceramic grades. It melts at 2,080°C (3,776 °F).
Mechanical10
The elastic modulus is 220 GPa (31.9 Msi).
Thermal5
SrTiO3 POLY is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 6 W/m·K (3.47 BTU/hr·ft·°F), worse than 61% of ceramic grades. Thermal expansion is 9.4 µm/m·K (5.22 µin/in·°F).
Electrical5
SrTiO3 POLY is an electrical insulator with a dielectric strength of 10 kV/mm (254 V/mil) and a resistivity of 1×10⁸ Ω·m.
Chemical & Environmental2
Corrosion resistance is very good (80/100), better than 56% of ceramic grades.
Sustainability4
Producing a kilogram of SrTiO3 POLY takes about 90 MJ of energy and emits 6.5 kg of CO₂ — less than 62% of ceramic grades. Typical recycled content is 0%.
Manufacturability2
SrTiO3 POLY's machinability is not recommended (10/100, better than 76% of ceramic grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with SrTiO3 POLY
Is SrTiO3 easy to machine?
Green machining before firing for ceramics; fired or single-crystal material requires diamond sawing, grinding and lapping — chipping-prone due to low K_IC and {100} cleavage.
Can SrTiO3 be welded?
Not weldable; join by glass frit, active-metal brazing or diffusion bonding to matched-CTE metals (Kovar-class alloys are a rough CTE match).
Can SrTiO3 be formed, bent or molded?
Uniaxial/isostatic pressing, tape casting or slip casting of the powder, sintered 1350–1550 °C in air; single crystals grown by Verneuil or float-zone.
What surface finishes work on SrTiO3?
CMP to epi-ready <0.3 nm RMS; buffered-HF etch plus 950–1050 °C anneal gives TiO2-terminated stepped surfaces; avoid reducing anneals that blacken the crystal.
SrTiO3 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| SrOstoichiometric SrTiO3 basis | 56 – 57 | 56.5 |
| Nb2O5only in Nb-doped conductive variant (0.05–0.7 wt% Nb) | 0 – 1 | 0 |
| TiO2Sr/Ti ratio typically 0.99–1.01 | ≥ 43 (balance) | — |
SrTiO3 POLY — frequently asked
What is SrTiO3 POLY used for?
SrTiO3 POLY is typically used for ceramic capacitor dielectrics, thin-film epitaxy substrates and varistors. In short: high-permittivity perovskite oxide; standard oxide-epitaxy substrate; conductive Nb-doped option.
Is SrTiO3 POLY easy to machine?
Not especially — machinability is rated not recommended (10/100, better than 76% of ceramic grades). Green machining before firing for ceramics; fired or single-crystal material requires diamond sawing, grinding and lapping — chipping-prone due to low K_IC and {100} cleavage.
Can SrTiO3 POLY be welded?
Not weldable; join by glass frit, active-metal brazing or diffusion bonding to matched-CTE metals (Kovar-class alloys are a rough CTE match).
What surface finishes work on SrTiO3 POLY?
CMP to epi-ready <0.3 nm RMS; buffered-HF etch plus 950–1050 °C anneal gives TiO2-terminated stepped surfaces; avoid reducing anneals that blacken the crystal.
Can SrTiO3 POLY be formed, bent or molded?
Uniaxial/isostatic pressing, tape casting or slip casting of the powder, sintered 1350–1550 °C in air; single crystals grown by Verneuil or float-zone.
What is the maximum service temperature of SrTiO3 POLY?
SrTiO3 POLY is rated for continuous use to about 1,100°C (2,012 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASM Engineered Materials Handbook, Vol. 4 — Ceramics and Glasses — ASM International (1991)
- CRC Handbook of Chemistry and Physics (perovskite oxide property tables) — CRC Press (2022)
- SrTiO3 single-crystal substrate specification (epi-polished, undoped and Nb-doped) — MTI Corporation / Crystec / SurfaceNet (2023)
- Springer Materials — elastic and dielectric constants of SrTiO3 — Springer (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.