Electrical Transport — Co-Ca Phosphonate Showing Humidity-Sensitive Single Crystal to Single Crystal Structural Transformation and Tunable Proton Conduction Properties

5 measurement groups · 11 results

Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.

Pressed CoCa.nH2O pellet for proton conductivity · Pellet

Pressed pellet measured at 25 C under different RH from 40% to 95%; frequency range 1 MHz to 0.1 Hz.

Temperature: 298 K
Atmosphere: Controlled relative humidity
Geometry: 2.5 mm diameter, 0.58 mm thickness pellet; gold paste and gold wires.
Context: pristine framework powder pellet
Measurement source: main p.5, article p.8120 · Proton Conduction of Powdered Sample · Figure 2c inset; SI Figures S5-S6

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Pellet humidity-dependent conductivity change	ca. 5 orders of magnitude decrease from 95% RH to 40% RH	—	—	Text Approximate	main p.1, article p.8116 · Abstract
Pressed pellet proton conductivity at 25 C and 40% RH	0.79 x 10-10 S cm-1	—	—	Text Exact Reported	main p.5, article p.8120 · Proton Conduction of Powdered Sample · Figure 2c inset
Pressed pellet proton conductivity at 25 C and 95% RH	1.55 x 10-5 S cm-1	—	—	Text Exact Reported	main p.5, article p.8120 · Proton Conduction of Powdered Sample · Figure 2c inset

Pressed CoCa.nH2O pellet for proton conductivity · Pellet

Pellet measured from 15 to 45 C at 95% RH, corresponding to CoCa.4H2O hydration.

Temperature: 288-318 K
Atmosphere: 95% RH
Geometry: Pressed pellet
Context: pristine framework powder pellet
Measurement source: main p.7, article p.8122 · Single Crystal Proton Conduction · Figure 4b-c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Pellet activation energy at 95% RH	Ea = 0.98 eV	—	—	Text Rounded Reported	main p.7, article p.8122 · Single Crystal Proton Conduction · Figure 4b

CoCa.nH2O single crystal measured along [010] · Single Crystal

Single crystal measured along [010] at 25 C under 40-95% RH and 20-35 C at 95% RH.

Temperature: 298 K for RH sweep; 293-308 K for 95% RH temperature sweep
Atmosphere: Controlled RH
Geometry: 0.70 x 0.29 x 0.08 mm3 crystal; gold wires at both ends of [010] axis.
Context: pristine framework single crystal
Measurement source: main p.6, article p.8121 · Single Crystal Proton Conduction · Figure 4a-b,d; SI Figures S10-S11,S17

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Single-crystal [010] activation energy at 95% RH	Ea = 0.90 eV	—	—	Text Rounded Reported	main p.7, article p.8122 · Single Crystal Proton Conduction · Figure 4b
Single-crystal [010] proton conductivity at 25 C and 95% RHMarked as a best value within this paper	1.00 x 10-3 S cm-1	—	—	Text Exact Reported	main p.6, article p.8121 · Single Crystal Proton Conduction · Figure 4a
Single-crystal [010] humidity-response trend from Figure 4a	Conductivity increases monotonically over ca. 40-95% RH, visually from about 10-10 to 10-3 S cm-1	—	visual lower bound approximate from logarithmic axis	Figure Axis Approximate	main p.6, article p.8121 · Single Crystal Proton Conduction · Figure 4a

CoCa.nH2O single crystal measured along [202] · Single Crystal

Single crystal measured along [202] at 25 C under RH sweep and 20-35 C at 95% RH.

Temperature: 298 K for RH sweep; 293-308 K for 95% RH temperature sweep
Atmosphere: Controlled RH
Geometry: 0.65 x 0.30 x 0.15 mm3 crystal; gold wires at both ends of [202] axis.
Context: pristine framework single crystal
Measurement source: main p.6, article p.8121 · Single Crystal Proton Conduction · Figure 4a-b,e; SI Figures S12-S13,S18

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Single-crystal [202] activation energy at 95% RH	Ea = 0.86 eV	—	—	Text Rounded Reported	main p.7, article p.8122 · Single Crystal Proton Conduction · Figure 4b
Single-crystal [202] proton conductivity at 25 C and 95% RH	4.49 x 10-6 S cm-1	—	—	Text Exact Reported	main p.7, article p.8122 · Single Crystal Proton Conduction · Figure 4a

CoCa.nH2O single crystal measured along [20-1] · Single Crystal

Single crystal measured along [20-1] at 25 C under RH sweep and 20-35 C at 95% RH.

Temperature: 298 K for RH sweep; 293-308 K for 95% RH temperature sweep
Atmosphere: Controlled RH
Geometry: 0.58 x 0.33 x 0.11 mm3 crystal; gold wires at both ends of [20-1] axis.
Context: pristine framework single crystal
Measurement source: main p.6, article p.8121 · Single Crystal Proton Conduction · Figure 4a-b,f; SI Figures S14-S15,S19

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Single-crystal [20-1] activation energy at 95% RH	Ea = 0.58 eV	—	—	Text Rounded Reported	main p.7, article p.8122 · Single Crystal Proton Conduction · Figure 4b
Single-crystal [20-1] proton conductivity at 25 C and 95% RH	4.35 x 10-8 S cm-1	—	—	Text Exact Reported	main p.6, article p.8121 · Single Crystal Proton Conduction · Figure 4a