BaTiO3 PTC
Grade
PTC = donor-doped semiconducting ceramic
Pick when a self-regulating heater or over-current protector is needed: resistivity jumps several decades above the doped Curie point.
Values for the PTC condition
Other BaTiO3 tempers and conditions
BaTiO3 is listed in 3 conditions; see the grade overview at BaTiO3.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PTCThis page Donor-doped semiconducting ceramic | Pick when a self-regulating heater or over-current protector is needed: resistivity jumps several decades above the doped Curie point. | — | 38 | 0.05 | 500 HV | 3 W/m·K |
SINTDefault Sintered | Standard dense fired body for capacitor dielectrics, piezo discs and dielectric test parts. | — | 45 | 0.05 | 550 HV | 3 W/m·K |
Single crystal | Use for photorefractive optics, domain-engineering research and reference dielectric/piezo measurements; expensive and small sizes only. | — | 55 | 0 | 600 HV | 5 W/m·K |
What is BaTiO3 PTC?
BaTiO3 PTC is BaTiO3 in the PTC grade — pick when a self-regulating heater or over-current protector is needed: resistivity jumps several decades above the doped Curie point. BaTiO3 PTC has a tensile strength of 38 MPa (5.51 ksi), weaker than 70% of ceramic grades. Elongation at break is 0.05% and the elastic modulus is 95 GPa (13.8 Msi). BaTiO3 PTC has a density of 5.7 g/cm³ (0.206 lb/in³), heavier than 58% of ceramic grades. It melts at 1,625°C (2,957 °F). SINT is the default condition FabDigit quotes; PTC is available on request or by drawing note.
Advantages
- Low embodied carbon — 5 kg CO₂/kg, better than 76% of ceramic grades
Limitations
- Low fracture toughness — 0.9 MPa·√m (0.819 ksi·√in), worse than 96% of ceramic grades
- Poor heat conductor — 2.5 W/m·K (1.44 BTU/hr·ft·°F), worse than 83% of ceramic grades
- Limited service temperature — 300°C (572 °F), worse than 82% of ceramic grades
- Low stiffness — 95 GPa (13.8 Msi), worse than 75% of ceramic grades
BaTiO3 PTC properties
Typical room-temperature values for BaTiO3 PTC; 15 are specific to this condition. Other listed values are BaTiO3 reference data and may not represent this condition. Bars are the position among ceramic grades.
Physical4
BaTiO3 PTC has a density of 5.7 g/cm³ (0.206 lb/in³), heavier than 58% of ceramic grades. It melts at 1,625°C (2,957 °F).
Mechanical11
BaTiO3 PTC has a tensile strength of 38 MPa (5.51 ksi), weaker than 70% of ceramic grades. Elongation at break is 0.05% and the elastic modulus is 95 GPa (13.8 Msi).
Thermal5
BaTiO3 PTC is rated for continuous service to 300°C (572 °F). It conducts heat at 2.5 W/m·K (1.44 BTU/hr·ft·°F), worse than 83% of ceramic grades. Thermal expansion is 9 µm/m·K (5 µin/in·°F).
Electrical5
BaTiO3 PTC is an electrical insulator with a dielectric strength of 5 kV/mm (127 V/mil) and a resistivity of 0.5 Ω·m.
Chemical & Environmental2
Corrosion resistance is good (66/100), worse than 65% of ceramic grades.
Sustainability4
Producing a kilogram of BaTiO3 PTC takes about 60 MJ of energy and emits 5 kg of CO₂ — less than 76% of ceramic grades. Typical recycled content is 0%.
Manufacturability3
BaTiO3 PTC's machinability is not recommended (8/100, better than 69% of ceramic grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with BaTiO3 PTC
Is BaTiO3 easy to machine?
Green or bisque machining is the practical route; fired bodies require diamond grinding, dicing and lapping with care for chipping.
Can BaTiO3 be welded?
Not weldable — joined by metallization (Ag, Ni/Cu, Ag-Pd) plus soldering, or by active-metal/glass brazing.
Can BaTiO3 be formed, bent or molded?
Formed as tape-cast layers, uniaxial/isostatic pressed discs or extruded shapes, then sintered 1250–1400 °C (lower with Cu-compatible reducing atmospheres and sintering aids).
What surface finishes work on BaTiO3?
Fired surfaces are lapped/polished for electrode adhesion; termination by screen-printed silver, sputtered Ni/Cr or electroless Ni plating.
BaTiO3 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 |
|---|---|---|
| Bastoichiometric BaTiO3, Ba/Ti typically 0.995–1.005 | 58 – 59.5 | 58.9 |
| Ti | 20 – 21 | 20.5 |
| dopants (Y, Nb, Mn, Mg, Ca, Zr, rare eargrade-specific: donor doping for PTC, Mg/rare-earth core-shell for X7R MLCC | 0 – 3 | 0.5 |
| O | balance | — |
BaTiO3 PTC — frequently asked
What is BaTiO3 PTC used for?
BaTiO3 PTC is typically used for MLCC capacitor dielectrics, PTC thermistors, piezoelectric transducers and PTC heaters. In short: highest-permittivity capacitor dielectric; ferroelectric perovskite base material; PTC resistance switching.
What is the tensile strength of BaTiO3 PTC?
BaTiO3 PTC has a typical tensile strength of 38 MPa (5.51 ksi) — weaker than 70% of ceramic grades. Strength varies by condition: see the 3 listed tempers.
Is BaTiO3 PTC easy to machine?
Not especially — machinability is rated not recommended (8/100, better than 69% of ceramic grades). Green or bisque machining is the practical route; fired bodies require diamond grinding, dicing and lapping with care for chipping.
Can BaTiO3 PTC be welded?
Not weldable — joined by metallization (Ag, Ni/Cu, Ag-Pd) plus soldering, or by active-metal/glass brazing.
What surface finishes work on BaTiO3 PTC?
Fired surfaces are lapped/polished for electrode adhesion; termination by screen-printed silver, sputtered Ni/Cr or electroless Ni plating.
Can BaTiO3 PTC be formed, bent or molded?
Formed as tape-cast layers, uniaxial/isostatic pressed discs or extruded shapes, then sintered 1250–1400 °C (lower with Cu-compatible reducing atmospheres and sintering aids).
What is the maximum service temperature of BaTiO3 PTC?
BaTiO3 PTC is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Engineered Materials Handbook Vol. 4: Ceramics and Glasses — ASM International (1991)
- Principles of Electronic Ceramics / Physical Ceramics — Wiley (1997)
- Barium titanate powders and MLCC dielectric grades — Sakai Chemical / Ferro / Nippon Chemical (2023)
- Landolt-Börnstein: Ferroelectrics and Related Substances (perovskite oxides) — Springer (2002)
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.